The development of the human body; a manual of human embryology . Fir. 117.—External Surface of the Os Innominatum showing theAttachment of Muscles and the Zones Supplied by the VariousNerves. 12, Twelfth thoracic nerve; / to V, lumbar nerves; 1 and 2, sacralnerves.—(Bolk.) that of the outer portion, and, extending to the tips of thetoes, they are reflected upon the plantar surface and so 236 THE DEVELOPMENT OF THE HUMAN BODY. loop upward on the posterior surface of the leg towardtheir point of origin from the trunk. In a transverse section through any part of the limb,. Fig. 118.—Sections thr
The development of the human body; a manual of human embryology . Fir. 117.—External Surface of the Os Innominatum showing theAttachment of Muscles and the Zones Supplied by the VariousNerves. 12, Twelfth thoracic nerve; / to V, lumbar nerves; 1 and 2, sacralnerves.—(Bolk.) that of the outer portion, and, extending to the tips of thetoes, they are reflected upon the plantar surface and so 236 THE DEVELOPMENT OF THE HUMAN BODY. loop upward on the posterior surface of the leg towardtheir point of origin from the trunk. In a transverse section through any part of the limb,. Fig. 118.—Sections through (A) the Thigh and (B) the Calf show-ing the Zones Supplied by the Nerves. The Nerves are Num-bered in Continuation with the Thoracic Series.—{A after Bolk.) accordingly, each myotome concerned will be cut twice,once in the descending (dorsal) and once in the ascending(ventral) portion of the loop, the arrangement found being THE LIMB MUSCLES. 237 that represented in Fig. 118. The modifications under-gone by the various myotomes throughout the course oftheir loops resemble those already described as occurring inthe trunk myotomes. Thus, each of the muscles repre-sented in Fig. 118, B, is formed by the fusion of elementsderived from two or more myotomes; the soleus and gas-trocnemius represent deep and superficial layers formedfrom the same myotomes by a horizontal (tangential) split-ting, these same muscles contain a portion of the second
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
