. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. Fig. 37. A tiansverse section of the neck. The separate muscles, as they arearranged in layers, with their investing fasciae, are beautifully represented. Asthe system is symmetrical, figures are placed only on one side. In the trunk themuscles are arranged in layers, surrounded by fasciae, as in the neck. The sameis true of the muscles of the upper and lower limbs. 12, The trachea, (windpipe.) 13, The oesophagus, (gullet.) 14, The carotid artery andjugular vein. 28, One of the bones of the spina
. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. Fig. 37. A tiansverse section of the neck. The separate muscles, as they arearranged in layers, with their investing fasciae, are beautifully represented. Asthe system is symmetrical, figures are placed only on one side. In the trunk themuscles are arranged in layers, surrounded by fasciae, as in the neck. The sameis true of the muscles of the upper and lower limbs. 12, The trachea, (windpipe.) 13, The oesophagus, (gullet.) 14, The carotid artery andjugular vein. 28, One of the bones of the spinal column. The figures that are placedin the white spaces represent some of the fascia?; the other figures indicate muscles. 157. The muscles may be arranged, in conformity with thegeneral division of the body, into four parts: 1st. Those ofthe Head and Neck. 2d. Those of the Trunk. 3d. Thoseof the Upper Extremities. 4th. Those of the Lower Ex-tremities. 156. Give a reason why the limbs of youth are rounder than those of theaged. Describe fig. 37. 68 ANATOMY, PHYSIOLOGY, AND HYGIENE. Fig. Fig. 38. The superficial layer of muscles on the face and neck. 1,1, The occipito-frontalis muscle. 2, The orbicularis palpebrarum. 6, The levator labii The levator anguli oris. 8, The zygomaticus minor. 9, The zygomaticus , The masseter. 11, The depressor labii superioris. 13, The orbicularis , The depressor anguli oris. 16, The depressor labii inferioris. 18, The sterno-hyoideus. 19, The platysma-myodes. 20, The superior belly of the , The sterno-cleido mastoideus. 22, The scalenus medius. 23, The inferior bellyof the omo-hyoideus. 24, The trapezius.* Practical Explanation. The muscle 1, 1, elevates the eyebrows. The muscle 2closes the eye. The muscle 6 elevates the upper lip. The muscles 7, 8, 9, elevatethe angle of the mouth. The muscle 10 brings the teeth together when eating. Themuscle 11 depresses the upper lip. The muscle 13 closes the mout
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