26o 



COMPARATIVE ANATOMY 



Fig. 2 1 6. — Diagrammatic outlines to illustrate various types of muscle architecture, 

 and the relations of the main nerve branches to the fiber-bundles of the muscle, a. Two 

 segments of the rectus abdominis muscle of a small mammal, b, Portion of sheet-like 

 muscle with two nerve-branches and intramuscular nerve plexus, c. Typical quadri- 

 lateral muscle with nerve passing across the muscle about midway between the tendons. 

 d and e, Two triangular muscles with different types of innervation. /, Long ribbon-like 

 muscle with interdigitating fiber-bundles, g, Unipenniform muscle, h, Bipenniforra 

 muscle, i. Typical fusiform muscle. The main intramuscular nerve-branches are 

 distributed to the fiber-bundles about midway between their origins and insertions. 

 (From Morris' "Human Anatomy.") 



