Covers the axillary nerve, from its origin in the posterior cord of the brachial plexus and its course through the quadrangular space to the surgical neck of the humerus, then its three branches and their motor and sensory roles for the deltoid, teres minor and shoulder skin. It then describes the musculocutaneous nerve: its origin from the lateral cord, its mixed motor and sensory nature, the muscles it supplies in the arm, its cutaneous supply to the lateral forearm, and its course through the arm.
Topic 10 of 44 in the MU Sofia syllabus for Anatomy (PNS) (Medicine, Year 2). The free AceMed note covers it in 5 sections, about 286 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
(1)
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.
SUPERIOR LATERAL CUTANEOUS nerve of the arm
Continue reading free
The whole note, all 5 sections, is free with an AceMed account, with its 10 flashcards. Premium adds flashcard recall, highlights and Ask AI.
