. Chordate morphology. Morphology (Animals); Chordata. EMBRYOLOGICAL DEVELOPMENT The embryological origin of the limb muscles gives an insight into their functional differentiation. The musculature of the mammal arises as dorsal (extensor) and ventral (flexor) condensations of mes- enchyme in the limb bud. Table 14-2 indicates the progres- sive modification of these masses in the pectoral limb into proximal, forearm, and hand segments and the separate components of the proximal mass. The phylogeny of the scapular muscles of the placental mammal is indicated by their ontogeny in the opossum. In

- Image ID: RJ5JM2
. Chordate morphology. Morphology (Animals); Chordata. EMBRYOLOGICAL DEVELOPMENT The embryological origin of the limb muscles gives an insight into their functional differentiation. The musculature of the mammal arises as dorsal (extensor) and ventral (flexor) condensations of mes- enchyme in the limb bud. Table 14-2 indicates the progres- sive modification of these masses in the pectoral limb into proximal, forearm, and hand segments and the separate components of the proximal mass. The phylogeny of the scapular muscles of the placental mammal is indicated by their ontogeny in the opossum. In
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Image ID: RJ5JM2
. Chordate morphology. Morphology (Animals); Chordata. EMBRYOLOGICAL DEVELOPMENT The embryological origin of the limb muscles gives an insight into their functional differentiation. The musculature of the mammal arises as dorsal (extensor) and ventral (flexor) condensations of mes- enchyme in the limb bud. Table 14-2 indicates the progres- sive modification of these masses in the pectoral limb into proximal, forearm, and hand segments and the separate components of the proximal mass. The phylogeny of the scapular muscles of the placental mammal is indicated by their ontogeny in the opossum. In Echidna or the reptile the supracoracoideus muscle is a unit, just as it is in the early developmental stages of the opossum (Figure 14-11). In the latter the single muscle grows backward and upward, bifurcates at the spine of the scapula to become the supra and infraspinatus muscles. The embryology of other muscles indicates changes in shape, number of parts, and even origin and insertion. Circuitous routes of innervating nerves are observed to be the result of migration of the muscle. INNERVATION Another aspect of myology which has been emphasized concerns innervation, the identification of the nerve serving each muscle and the constancy of this rela- tionship in the several classes. Much of the past discussion tibialis anterior.. gastrocnemius caput medialis .gastrocnemius caput lateralis extensor digitorum longus —soleus peroneus longus peroneus tertius peroneus brevis. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Jollie, Malcolm. New York, Reinhold

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