162. Review of the skin and muscles innervation of the upper extremity.
Covers the axillary nerve, from its origin in the posterior cord and its course through the quadrangular space to the surgical neck of the humerus, with its three branches and their motor and sensory roles. Then describes the musculocutaneous nerve, a mixed nerve from the lateral cord, listing the arm muscles it supplies, its lateral forearm cutaneous branch and its path through the arm.
Topic 161 of 236 in the MU Pleven syllabus for Anatomy Bones and Muscles (Medicine, Year 2). The free AceMed note covers it in 5 sections, about 285 words (2 min of reading), with 10 flashcards.
In this note
AXILLARY NERVE (C5-C6)
Anatomical Course :
MUSCULOCUTANEOUS NERVE
Functions :-
Course :
AXILLARY NERVE (C5-C6)
Is one of the major nerves derived from the brachial plexus. It arise from the posterior cord.
* Quadrangular space:
Anatomical Course :
Axilla (posterior to the axillary artery)
Pass through → quadrangular space (accompanied by the post. circumflex humeral art. & vein).
Pass medially → surgical neck of the humerus
Gives 3 branches
Posterior terminal branch
Anterior terminal branch
Articular branch
Posterior terminal branch – provides motor innervation to the posterior aspect of the deltoid muscle and teres minor. It also innervates the skin over the inferior part of the deltoid as the upper lateral cutaneous nerve of the arm.
Anterior terminal branch – winds around the surgical neck of the humerus and provides motor innervation to the anterior aspect of the deltoid muscle. It terminates with cutaneous branches to the anterior and anterolateral shoulder.
Articular branch – supplies the glenohumeral joint
* Motor functions
Deltoid m.
teres minor
* Sensory functions
As superior lateral cutaneous nerve.
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