coracotrapezius, acromiotrapezius, and spinotrapezius the three distinct parts of the trapezius muscle in the cat
accessory nerve innervates this muscle in the human
<h3>Is the brachial plexus responsible for trapezius innervation?</h3>
With the exception of the trapezius muscle, which is innervated by the spinal accessory nerve (CN XI), and a patch of skin close to the axilla, which is innervated by the intercostobrachial nerve, the whole upper limb is innervated by the brachial plexus.
The trapezius group and the deltoid group are the two main muscle groups of the cat's back and shoulder. The clavotrapezius inserts on the clavicle after emerging from the middorsal line of the neck and the rear of the head.
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