Anatomy and physiology : designed for academies and families . draws the scapula forward and downward when theribs are fixed, lhe muscles 12, 16, 17, and IS, bend tiie body forward or elevate thehips when the muscles of both sides act. They likewise depress the ribs in expira-won. When the muscles on one side only act, the body is twisted to the same side How distinguished ? Describe Fig. 61. ANATOMY OF THE MUSCULAR SYSTEM. 99 Muscles are divided into two great classes ; voluntary andinvoluntary. They may be arranged in conformity with thegeneral division of the body, into — 1. Those of the h;
Anatomy and physiology : designed for academies and families . draws the scapula forward and downward when theribs are fixed, lhe muscles 12, 16, 17, and IS, bend tiie body forward or elevate thehips when the muscles of both sides act. They likewise depress the ribs in expira-won. When the muscles on one side only act, the body is twisted to the same side How distinguished ? Describe Fig. 61. ANATOMY OF THE MUSCULAR SYSTEM. 99 Muscles are divided into two great classes ; voluntary andinvoluntary. They may be arranged in conformity with thegeneral division of the body, into — 1. Those of the h;adand neck. 2. Those of the trunk. 3. Those of the upperextremity. 4. Those of the lower extremity. The muscles of the head and neck are represented in , 59 and 60. The interstices between the different musclesare filled with adipose matter or fat. To the presence of thistissue, youth is indebted for roundness and beauty of form. The muscles of the trunk may be thus divided— of the thorax and abdomen. 2d. The muscles of theback. Fig. Fig. G2. Represents a lateral view of the trunk of the body. 1, The costal originof the lattissimus dorsi muscle. 2, The serratus magnus. 3, The upper part of theexternal oblique. 4, Two of the external intercostals. 5, Two of the internal inter-costals. 6, The transversalis. 7, Its posterior aponeurosis. 8, Its anterior aponeu-rosis. 10, The right rectus muscle. 11, The arched opening left by Pouparts liga-ment, through which femoral hernia passes. 12, 12, The gluteus maximus and ten-sor femoris muscles. 13, The crest of the ilium or haunch bone. The recti muscles bend the thorax upon the abdomen, andthrough the medium of the transverse lines, are enabled to Into how many clf-sses are muscles divided ? 100 ANATOMY AND PHYSIOLOGY. act when their sheath is curved inwards by the action of thetransversales. The abdominal muscles are expiratory, andthe chief agents for expelling the residuum from the rectum,the bile from the ga
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectanatomy, bookyear1847
