The lower subscapular nerve (alternatively, inferior subscapular nerve) is a nerve that supplies the lower part of the subscapularis muscle, and also supplies the teres major muscle.
It consists of fibres from C5-6 spinal nerves. It branches from the posterior cord of the brachial plexus.
Teres major is sometimes supplied by a separate branch.
The right brachial plexus (infraclavicular portion) in the axillary fossa; viewed from below and in front.
Brachial plexus with courses of spinal nerves shown
This article incorporates text from a public domain edition of Gray's Anatomy.