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The axillary nerve is a nerve of the human body, that comes off the posterior cord of the brachial plexus at the level of the axilla (armpit) and carries nerve fibers from C5 and C6. The axillary nerve travels through the quadrangular space with the posterior circumflex humeral artery and vein.
Muscular and sensory innervation
The axillary nerve also carries sensory information from the shoulder joint, as well as the skin covering the inferior region of the deltoid muscle (which is innervated by the Superior Lateral Cutaneous Nerve branch of the Axillary nerve).
When the axillary nerve splits off from the posterior cord, the continuation of the cord is the radial nerve.
It lies at first behind the axillary artery, and in front of the Subscapularis, and passes downward to the lower border of that muscle.
It then winds backward, in company with the posterior humeral circumflex artery, through a quadrilateral space bounded above by the Teres Minor, below by the Teres major, medially by the long head of the Triceps brachii, and laterally by the surgical neck of the humerus, and divides into an anterior and a posterior branch.
The trunk of the axillary nerve gives off an articular filament which enters the shoulder-joint below the Subscapularis.
The axillary nerve may be injured in anterior dislocations of the shoulder joint, compression of the axilla with a crutch or fracture of the surgical neck of the humerus. Injury to the nerve results in: -
1. Paralysis of the teres minor and deltoid muscles. Abduction of the shoulder is impaired.
2. Loss of sensation over a small part of the lateral upper arm
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Axillary_nerve". A list of authors is available in Wikipedia.|