. The anatomy of the human body. Human anatomy; Anatomy. 636 Section of skin from the head, magnified U tinies. Fig. 228. alae of the nose, in masses which look like small worms. These sebaceous follicles are somewhat analogous to the follicles of the mucous membranes; they are not found in the palms of the hands and soles of the feet; but, in all probability, they exist in every part of the body : they are especially observed in the axiUa, on the hairy scalp, and around the margins of the anus and vulva, and the openings of the nose and mouth : they are very much developed in the
. The anatomy of the human body. Human anatomy; Anatomy. 636 Section of skin from the head, magnified U tinies. Fig. 228. alae of the nose, in masses which look like small worms. These sebaceous follicles are somewhat analogous to the follicles of the mucous membranes; they are not found in the palms of the hands and soles of the feet; but, in all probability, they exist in every part of the body : they are especially observed in the axiUa, on the hairy scalp, and around the margins of the anus and vulva, and the openings of the nose and mouth : they are very much developed in the new-born infant. The sebaceous follicles appear to me to have a glandular structure ; and this is particularly evident in those of the axilla, the organization of which seems to me to be more complex than that of those found in other parts. The supposition that these follicles are formed by the reflection of the thin portion of the skin is altogether fanciful.* The Nails and the Hair.—In man the horny growths of the skin are less developed than in any animal expo- sed to similar atmospheric conditions ; and in man, also, we find the highest development of the sense of touch. The nails of the human subject are hard, yet flexible and elastic, semi-transparent scales, and present the ap- pearance of laminae of horn : they are situated upon the dorsal surface of the last phalan- ges, which are therefore called the ungual phalanges; and they appear rather to be in- fended for the support and protection of the pulpy extremities of the fingers, than as weap- ons of attack, or instruments of defence and prehension. In a state of civilization it is customary, therefore, to cut off that part of the nail which projects beyond the end of the finger. The ingenuity of man enables him to provide himself with offensive weapons amply sufficient to compensate for the weakness of those provided by nature, which, in- deed, are quite rudimentary in him, and if more fully developed, would greatly
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
