. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. 64 SKIN. Fig. 51. The skin consists of two layers, the true skin, also called cutis vera or chorion, and the cuticle or epidermis. The cutis vera'' is the thicker and deeper of the two: is white, and semi-transparent in all persons ; its internal or inferior surface is much blended with the subjacent cellu- lar tissue, and contains a number of pits or depressions ; the external surface has a number of conical project
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. 64 SKIN. Fig. 51. The skin consists of two layers, the true skin, also called cutis vera or chorion, and the cuticle or epidermis. The cutis vera'' is the thicker and deeper of the two: is white, and semi-transparent in all persons ; its internal or inferior surface is much blended with the subjacent cellu- lar tissue, and contains a number of pits or depressions ; the external surface has a number of conical projections called pajnllce tactus^ which are particularly numerous in those parts where there is much motion. On the hands and feet they are arranged in spiral and semicircular rows, which occasion a similar wrinkle of the cuticle. They consist of an artery, vein and nerve ; the sensibility of a part is in ratio to their number. The skin itself is formed of con- densed cellular tissue, the yellow fibrous element predominating where great elasti- city is required, as in the armpit; the white element, where resistance is de- manded, as in the sole of the foot. Between the interstices of these fibres, pass innu- merable vessels, ducts, &c., &c. It is thickened by pressure; boiling reduces it to gelatine; and tannin converts it into leather. The cuticle or epidermis" affords pro- tection to parts most exposed to pressure or friction ; its thickness varies with the amount of pressure to which it is sub- jected ; compare the hand of an artisan with that of a delicate female. It is rot per- meated by vessels or nerves, but consists of particles arranged in different laminse ; those that are deepest are granular, those of the next layer are more compressed, whilst those upon the surface are mere scales. These superficial scales, which are horny, are constantly being shed, and \^^^if(^^^^f/Wi "^^'^ particles constantly supplied by the 9'^W/i^W)Jiwr^lm\\ moist granules, which
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