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Nerves (Anatomy)

Elbow nerve anatomy: radial, median, ulnar & musculocutaneous – critical for surgical approach & fracture management injury prevention.

29 citationsUpdated Sep 2026
Illustration: Nerves (Anatomy)

Overview

The brachial plexus is anatomically conceptualized as a network beginning with five nerves and terminating in five nerves [3]. Accurate treatment of brachial plexus lesions requires a clear understanding of this anatomy and its variations, alongside adequate exposure and delineation of pathology [8]. Magnetic resonance neurography provides anatomical correlation and pinpoints nerve pathology, thereby enhancing diagnostic confidence and guiding appropriate treatment planning [2].

Specific nerve anatomy dictates surgical considerations and functional outcomes. The majority of the innervation of the anterior capsule of the elbow comes from the radial and musculocutaneous nerves with minimal contribution from the median nerve [1], and awareness of this neuroanatomical distribution may allow preservation of receptors during surgical procedures for elbow joint pathology [15]. The course of the radial nerve in the distal part of the upper arm has great variety [4], while variations in musculocutaneous nerve anatomy are quite common, and even unreported variations can be encountered [11]. The findings regarding the anatomic branch pattern of the axillary nerve are useful for identifying each of the branches and have implications for surgeries related with selective innervation [5].

The ulnar nerve anatomy is complex with numerous variations and potential compression sites, including the arcade of Struthers, medial intermuscular septum, and cubital tunnel [6]. A good knowledge of anatomy of ulnar nerve and its variations is necessary to prevent iatrogenic injury to this nerve and its aberrant branches during ulnar nerve release at the elbow [13]. An understanding of the anatomy of the Guyon canal is essential for diagnosis in patients presenting with motor and/or sensory deficits in the hand [26]. Functionally, the median nerve creates the “rock position” of the pronated fist [16], the radial nerve extends the wrist and hand forming the “paper position” [16], and the ulnar nerve creates the “scissor position” [16].

Osseous Anatomy

In growing children, the positions of the radial and axillary nerves maintain linear relationships with arm lengths [17]. Furthermore, the locations of these nerves in relation to palpable osseous landmarks are predictable [17].

Ligaments and Joint Capsule

The anterior capsule of the elbow joint receives the majority of its innervation from the radial and musculocutaneous nerves [1]. In contrast, the median nerve provides minimal innervation to this structure [1]. Understanding the neuroanatomical distribution of receptors within the elbow joint capsule may facilitate their preservation during surgical procedures for elbow joint pathology [15].

Muscles and Tendons

The lateral antebrachial cutaneous nerve crosses over the biceps tendon in 50% of specimens [10]. For annular ligament reconstruction of the elbow, a distally based tendon graft using the tendon of the superficial head of the brachialis muscle is feasible in most patients [29].

Neurovascular Anatomy

Brachial Plexus

Radial Nerve: The majority of the innervation of the anterior capsule derives from the radial and musculocutaneous nerves, with minimal contribution from the median nerve [1].

Ulnar Nerve: Intraneural fascicular groups of the ulnar and median nerves are identifiable for variable distances in the distal forearm, providing an anatomical basis for microsurgical group fascicular repair and nerve-grafting [9].

Median Nerve: The median nerve is a structure at risk when performing elbow arthroscopy of the antero-medial compartment [7].

Axillary Nerve: Findings regarding the axillary nerve are useful for identifying each of its branches and have implications for surgeries related to selective innervation [5].

Lateral Antebrachial Cutaneous Nerve: The nerve crossed over the biceps tendon in 50% of the specimens [10].

Biomechanics and Function

Capsular Innervation: The anterior elbow capsule receives the majority of its innervation from the radial and musculocutaneous nerves, with minimal contribution from the median nerve [1]. Simple intra-articularly accessible anatomical landmarks serve as safe guides for avoiding radial nerve injury [12].

Nerve Kinematics and Positioning: In growing children, the positions of the radial and axillary nerves maintain linear relationships with arm lengths, and their locations relative to palpable osseous landmarks are predictable [17]. The posterior interosseous nerve moves farther from the radial head during elbow extension than flexion, and during forearm pronation than supination; however, distal migration is minimal at 3.5 mm [22]. High-resolution sonography clearly demonstrates the morphology and dynamics of the ulnar nerve in the cubital tunnel [21].

Surgical Safety and Dissection Limits: Guidewire-inflicted injury to the posterior interosseous nerve is unlikely during the anterior single-incision approach based on distances between the entering guidewire trajectory and the nerve [14]. During a lateral approach without formal identification of the posterior interosseous nerve, dissection should be limited to 4.0 cm from the radiocapitellar joint regardless of forearm rotation, as pronation does not reliably increase the distance of the nerve to the joint [25].

Injury Mechanisms and Recovery: Nerve injury occurred at a significantly higher rate for subpectoral techniques during long head of the biceps tenodesis, but all nerve function recovered [20]. Local pressure exerted by a below elbow cast, potentially exacerbated by peripheral fluid retention in the perioperative period, is the cause of median and radial nerve deficit after coronary bypass surgery [31].

Rehabilitation and Repair: Tendon transfers are useful to restore function to the hand impaired and unbalanced by peripheral nerve injury, provided the limb has satisfactory tissue equilibrium and the donor is carefully selected [32]. A microsurgical technique for interfascicular nerve-grafting avoids tension at the suture site, which is identified as the most important factor influencing repair results [30].

Common Sites of Injury

Anatomical variations influence the risk of iatrogenic nerve damage during shoulder procedures. The lateral antebrachial cutaneous nerve crossed over the biceps tendon in 50% of the specimens [10]. Consequently, nerve injury occurred at a significantly higher rate for subpectoral techniques during long head of the biceps tenodesis [20]. Despite this elevated incidence, all nerve function recovered following nerve injury associated with long head of the biceps tenodesis [20].

Acute nerve injury also complicates closed fractures and dislocations of the elbow. In a series of 21 patients with acute nerve injury as a complication of closed fractures or dislocations of the elbow, 9 patients still had evidence of nerve damage [27]. The specific nerve lesions identified in this cohort were:

Ulnar nerve: 6 patients had ulnar nerve lesions [27]. Median nerve: 2 patients had median nerve lesions [27]. Radial nerve: 1 patient had a radial nerve lesion [27].

Surgical Anatomy

Brachial Plexus

The anatomic branch pattern of the axillary nerve is useful for identifying each of its branches and has implications for surgeries related to selective innervation [5].

Elbow Joint Innervation

Simple intra-articularly accessible anatomical landmarks serve as safe guides for avoiding radial nerve injury [12].

Median Nerve

The intraneural fascicular groups of the median nerve are identifiable for variable distances in the distal forearm, providing an anatomical basis for microsurgical group fascicular repair and nerve-grafting [9].

Ulnar Nerve

Knowledge of possible compression sites of the ulnar nerve is important to the surgeon so that complications are avoided and postoperative recurrence is decreased [23]. The intraneural fascicular groups of the ulnar nerve are identifiable for variable distances in the distal forearm, providing an anatomical basis for microsurgical group fascicular repair and nerve-grafting [9].

Radial Nerve and Posterior Interosseous Nerve

The posterior interosseous nerve moved farther from the radial head during elbow extension than flexion and during forearm pronation than supination, but distal migration was minimal (3.5 mm) [22]. The distances between the entering guidewire trajectory and the PIN show that guidewire-inflicted injury to the nerve is unlikely during the anterior single-incision approach [14].

Musculocutaneous Nerve

The previously described safe zone of 5 cm below the coracoid process may not be reliable to protect the musculocutaneous nerve or its twigs, as 91.7% of specimens had nerve entry points within this distance when twigs were accounted for [18].

Key Evidence

  • [L5] The majority of the innervation of the anterior capsule comes from the radial and musculocutaneous nerves with minimal contribution from the median nerve. [1] (10.1016/j.jhsa.2015.10.012)
  • [Paper] Its main benefit is providing anatomical correlation and pinpointing nerve pathology, thereby enhancing diagnostic confidence and guiding appropriate treatment planning. [2] (10.1177/23259671251400763)
  • [L5] The brachial plexus may be visualized simply as beginning with five nerves and terminating in five nerves. [3] (10.1016/s0749-0712(03)00088-x)
  • [L5] The course of the radial nerve in the distal part of the upper arm has great variety. [4] (10.1371/journal.pone.0186890)
  • [L5] The findings are useful for identifying each of the branches of the axillary nerve and have implications for surgeries related with selective innervation. [5] (10.1016/j.jse.2006.05.003)
  • [L5] The ulnar nerve anatomy is complex with numerous variations and potential compression sites, including the arcade of Struthers, medial intermuscular septum, and cubital tunnel. [6] (10.1016/j.hcl.2007.05.001)
  • [L5] The median nerve is a structure at risk when performing elbow arthroscopy of the antero-medial compartment. [7] (10.1016/j.arthro.2019.11.082)
  • [L5] A clear understanding of the anatomy of the brachial plexus and its variations, along with adequate exposure and delineation of pathology, is essential for accurate treatment of brachial plexus lesions. [8] (10.1016/j.hcl.2004.09.006)
  • [L5] The intraneural fascicular groups of the ulnar and median nerves are identifiable for variable distances in the distal forearm, providing an anatomical basis for microsurgical group fascicular repair and nerve-grafting. [9] (10.2106/00004623-198668020-00013)
  • [L5] The nerve crossed over the biceps tendon in 50% of the specimens. [10] (10.1016/j.jhsa.2024.04.018)
  • [L4] Variations in musculocutaneous nerve anatomy are quite common, and even unreported variations can be encountered. [11] (10.1016/j.jhsa.2022.07.014)
  • [L5] These simple intra-articularly accessible anatomical landmarks are safe guides for avoiding radial nerve injury. [12] (10.1016/j.arthro.2019.11.081)
  • [L4] A good knowledge of anatomy of ulnar nerve and its variations is necessary to prevent iatrogenic injury to this nerve and its aberrant branches during ulnar nerve release at the elbow. [13] (10.1016/j.jse.2008.07.015)
  • [L4] The distances between the entering guidewire trajectory and PIN show that guidewire-inflicted injury to the nerve is unlikely during the anterior single-incision approach. [14] (10.1177/0363546521992120)
  • [L5] Awareness of the neuroanatomical distribution of the receptors in the elbow joint capsule may allow their preservation during surgical procedures for elbow joint pathology. [15] (10.1177/1758573218760245)
  • [L4] The median nerve creates the “rock position” of the pronated fist, the radial nerve extends the wrist and hand forming the “paper position”, and the ulnar nerve creates the “scissor position”. [16] (10.1016/s0020-1383(02)00102-x)
  • [L4] The positions of the radial and axillary nerves maintain linear relationships with arm lengths in growing children, and their locations in relation to palpable osseous landmarks are predictable. [17] (10.2106/jbjs.19.00019)
  • [L5] The previously described safe zone of 5 cm below the coracoid process may not be reliable to protect the musculocutaneous nerve or its twigs, as 91.7% of specimens had nerve entry points within this distance when twigs were accounted for. [18] (10.1177/2325967120954417)
  • [L3] Nerve injury occurred at a significantly higher rate for subpectoral techniques, but all nerve function recovered. [20] (10.1177/2325967117s00397)
  • [L4] High-resolution sonography can clearly demonstrate the morphology and dynamics of the ulnar nerve in the cubital tunnel. [21] (10.1054/jhsb.1999.0317)
  • [L3] The posterior interosseous nerve moved farther from the radial head during elbow extension than flexion and during forearm pronation than supination, but distal migration was minimal (3.5 mm). [22] (10.5397/cise.2024.00213)
  • [L5] Knowledge of possible compression sites of the ulnar nerve is important to the surgeon so that complications are avoided and postoperative recurrence is decreased. [23] (10.1016/j.jse.2009.03.004)
  • [L5] The authors recommend limiting dissection to 4.0 cm from the radiocapitellar joint during a lateral approach without formal identification of the posterior interosseous nerve, regardless of forearm rotation, as pronation does not reliably increase the distance of the nerve to the joint. [25] (10.1016/j.jse.2006.09.004)
  • [L5] An understanding of the anatomy of the Guyon canal is essential for diagnosis in patients presenting with motor and/or sensory deficits in the hand. [26] (10.5435/jaaos-22-11-699)
  • [L4] In our series, 9 out of 21 patients we examined still had evidence of nerve damage, 6 patients having ulnar nerve lesions, 2 patients median nerve lesions and 1 patient a radial nerve lesion. [27] (10.1016/s0020-1383(79)80015-7)
  • [L5] A distally based tendon graft reconstruction of the annular ligament of the elbow using the tendon of the superficial head of the brachialis muscle would be feasible in most patients, based on this anatomic study. [29] (10.1016/j.jhsa.2013.04.008)
  • [L4] The paper describes a microsurgical technique for interfascicular nerve-grafting that avoids tension at the suture site, which is identified as the most important factor influencing repair results. [30] (10.2106/00004623-197254040-00004)
  • [L5] Investigations clearly suggest that the cause of the nerve deficit was the local pressure exerted by the cast, potentially exacerbated by peripheral fluid retention in the perioperative period. [31] (10.1016/s0020-1383(00)00106-6)
  • [L5] Tendon transfers are useful to restore function to the hand impaired and unbalanced by peripheral nerve injury, provided the limb has satisfactory tissue equilibrium and the donor is carefully selected. [32] (10.1016/j.jhsa.2010.05.023)

See Also

References

[1] Innervation of the Elbow Joint: A Cadaveric Study. The Journal of Hand Surgery. 2016. DOI: 10.1016/j.jhsa.2015.10.012

[2] Magnetic Resonance Neurography Findings in Clinically Suspected Posterior Interosseous Neuropathy: Response. Orthopaedic Journal of Sports Medicine. 2026. DOI: 10.1177/23259671251400763

[3] Brachial plexus anatomy. Hand Clinics. 2004. DOI: 10.1016/s0749-0712(03)00088-x

[4] The course of the radial nerve in the distal humerus: A novel, anatomy based, radiographic assessment. PLOS ONE. 2017. DOI: 10.1371/journal.pone.0186890

[5] The anatomic branch pattern of the axillary nerve. Journal of Shoulder and Elbow Surgery. 2007. DOI: 10.1016/j.jse.2006.05.003

[6] Ulnar Nerve Anatomy. Hand Clinics. 2007. DOI: 10.1016/j.hcl.2007.05.001

[7] Arthroscopic Anatomy of The Median Nerve And Brachial Artery Neurovascular Bundle At The Elbow. Arthroscopy. 2019. DOI: 10.1016/j.arthro.2019.11.082

[8] Clinically relevant surgical anatomy and exposures of the brachial plexus. Hand Clinics. 2005. DOI: 10.1016/j.hcl.2004.09.006

[9] Anatomical basis for repair of ulnar and median nerves in the distal part of the forearm by group fascicular suture and nerve-grafting.. The Journal of Bone & Joint Surgery. 1986. DOI: 10.2106/00004623-198668020-00013

[10] Anatomy of the Lateral Antebrachial Cutaneous Nerve: Landmarks for Procedures in the Cubital Fossa. The Journal of Hand Surgery. 2025. DOI: 10.1016/j.jhsa.2024.04.018

[11] Anatomic Variations of the Musculocutaneous Nerve and Clinical Implications for Restoration of Elbow Flexion. The Journal of Hand Surgery. 2022. DOI: 10.1016/j.jhsa.2022.07.014

[12] Radial Nerve Anatomy at the Elbow Joint and Its Arthroscopic Relevance. Arthroscopy. 2019. DOI: 10.1016/j.arthro.2019.11.081

[13] Unusual origin of the motor branch of the ulnar nerve to the flexor carpi ulnaris. Journal of Shoulder and Elbow Surgery. 2009. DOI: 10.1016/j.jse.2008.07.015

[14] Distance of the Posterior Interosseous Nerve From the Bicipital (Radial) Tuberosity at Varying Positions of Forearm Rotation: A Magnetic Resonance Imaging Study With Clinical Implications. The American Journal of Sports Medicine. 2021. DOI: 10.1177/0363546521992120

[15] Neuroanatomical distribution of sensory receptors in the human elbow joint capsule. Shoulder & Elbow. 2018. DOI: 10.1177/1758573218760245

[16] Rock–paper–scissors. Injury. 2003. DOI: 10.1016/s0020-1383(02)00102-x

[17] Establishing Safe Zones to Avoid Nerve Injury in the Approach to the Humerus in Pediatric Patients. Journal of Bone and Joint Surgery. 2019. DOI: 10.2106/jbjs.19.00019

[18] Relationship of the Musculocutaneous Nerve and Its Twigs to the Coracoid Process: An Operative Exposure. Orthopaedic Journal of Sports Medicine. 2020. DOI: 10.1177/2325967120954417

[20] Nerve Injury with Long Head of the Biceps Tenodesis. Orthopaedic Journal of Sports Medicine. 2017. DOI: 10.1177/2325967117s00397

[21] Morphology and Dynamics of the Ulnar Nerve in the Cubital Tunnel. Journal of Hand Surgery. 2000. DOI: 10.1054/jhsb.1999.0317

[22] In vivo dynamic migration of the posterior interosseous nerve across various elbow and forearm positions. Clinics in Shoulder and Elbow. 2024. DOI: 10.5397/cise.2024.00213

[23] Regional anatomic structures of the elbow that may potentially compress the ulnar nerve. Journal of Shoulder and Elbow Surgery. 2009. DOI: 10.1016/j.jse.2009.03.004

[25] Anatomic considerations regarding the posterior interosseous nerve at the elbow. Journal of Shoulder and Elbow Surgery. 2007. DOI: 10.1016/j.jse.2006.09.004

[26] Ulnar Nerve Entrapment at the Wrist. Journal of the American Academy of Orthopaedic Surgeons. 2014. DOI: 10.5435/jaaos-22-11-699

[27] Acute nerve injury as a complication of closed fractures or dislocations of the elbow. Injury. 1979. DOI: 10.1016/s0020-1383(79)80015-7

[29] Annular Ligament Reconstruction Using the Distal Tendon of the Superficial Head of the Brachialis Muscle: An Anatomical Feasibility Study. The Journal of Hand Surgery. 2013. DOI: 10.1016/j.jhsa.2013.04.008

[30] The Interfascicular Nerve-Grafting of the Median and Ulnar Nerves. The Journal of Bone & Joint Surgery. 1972. DOI: 10.2106/00004623-197254040-00004

[31] The below elbow cast: a cause of median and radial nerve injury after coronary bypass surgery. Injury. 2001. DOI: 10.1016/s0020-1383(00)00106-6

[32] Update on Tendon Transfers for Peripheral Nerve Injuries. The Journal of Hand Surgery. 2010. DOI: 10.1016/j.jhsa.2010.05.023

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a. The Licensor shall not be bound by any additional or different terms or conditions communicated by You unless expressly agreed.

b. Any arrangements, understandings, or agreements regarding the Licensed Material not stated herein are separate from and independent of the terms and conditions of this Public License.

Section 8 -- Interpretation.

a. For the avoidance of doubt, this Public License does not, and shall not be interpreted to, reduce, limit, restrict, or impose conditions on any use of the Licensed Material that could lawfully be made without permission under this Public License.

b. To the extent possible, if any provision of this Public License is deemed unenforceable, it shall be automatically reformed to the minimum extent necessary to make it enforceable. If the provision cannot be reformed, it shall be severed from this Public License without affecting the enforceability of the remaining terms and conditions.

c. No term or condition of this Public License will be waived and no failure to comply consented to unless expressly agreed to by the Licensor.

d. Nothing in this Public License constitutes or may be interpreted as a limitation upon, or waiver of, any privileges and immunities that apply to the Licensor or You, including from the legal processes of any jurisdiction or authority.

Creative Commons is not a party to its public licenses. Notwithstanding, Creative Commons may elect to apply one of its public licenses to material it publishes and in those instances will be considered the “Licensor.” The text of the Creative Commons public licenses is dedicated to the public domain under the CC0 Public Domain Dedication. Except for the limited purpose of indicating that material is shared under a Creative Commons public license or as otherwise permitted by the Creative Commons policies published at creativecommons.org/policies, Creative Commons does not authorize the use of the trademark "Creative Commons" or any other trademark or logo of Creative Commons without its prior written consent including, without limitation, in connection with any unauthorized modifications to any of its public licenses or any other arrangements, understandings, or agreements concerning use of licensed material. For the avoidance of doubt, this paragraph does not form part of the public licenses.

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