| Abstract: | The motor and cutaneous nerves associated with the pigeon's anterior latissimus dorsi tonus muscle are described. The motor nerve is traced from its origin within the brachialis longus superior nerve of the brachial plexus to within the epimysium of the muscle by means of serial cross sections. The nerve fibers differ in mean diameter at various sites along the nerve. They originate as small fibers within the plexus, become larger as they emerge and then gradually decrease in diameter as they approach the muscle. The number of nerve fibers remains relatively constant until the nerve divides into more than two branches, at which time the number increases. The cutaneous nerve passing through the anterior latissimus dorsi is described and is assumed not to play any role in the innervation, either sensory or motor, of the fibers in this muscle. |
