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CHORDATE ANATOMY 



Fig. 182. — 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, Bipenniform 

 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.") 



