10 12 07 - Muscular System II

10 12 07 - Muscular System II - Chapter 10: The Muscular...

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Chapter 10: The Muscular System II Each band of muscle is intercepted by a band of spinal nerves Each nerve has a designated segment 3- Cranial Nerves We have 12 pairs Appendicular Muscles One block of muscle for each somite will form Major types of movement at appendages: Extension - movement dorsally Flexion - movement ventrally Adduction- movement of limb toward body that is not extension Abduction- movement of limb away from body that is not extension/flexion Fish: divided into dorsal (extensor) and ventral (flexor) muscles Tetrapods: all appendicular muscles form from ventral and dorsal muscle masses that divide into multiple segments during development, forming separate muscles. Dorsal: generally, these muscles abduct and extend the limbs Ventral: adduct and flex There are some dorsal and some ventral muscles that partly wrap around a joint. Because of their action they are called rotators Some muscles fail to fuse together Branchiomeric muscles… But first, the vertebrate head: The head of vertebrates does not contain somites
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This note was uploaded on 08/16/2008 for the course BIOL 276 taught by Professor Johnson during the Spring '07 term at UNC.

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10 12 07 - Muscular System II - Chapter 10: The Muscular...

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