. A practical treatise on diseases of the skin, for the use of students and practitioners. he action of the arrectores pilo-rum muscles, by whose contractions the gland is to a degree is the reverse of what occurs in the coil-glands, whose secretionis impeded by the action of these same muscles. 42 DISEASES OF THE SKIN. Coil-glands. The Coil-glands, termed also Sweat or Sudoriparous glands,are globular coils situated in the subcutaneous tissue and in the deeperportions of the corium. They appear first in the fifth month of foetallife as buds projected downward from the prickle-
. A practical treatise on diseases of the skin, for the use of students and practitioners. he action of the arrectores pilo-rum muscles, by whose contractions the gland is to a degree is the reverse of what occurs in the coil-glands, whose secretionis impeded by the action of these same muscles. 42 DISEASES OF THE SKIN. Coil-glands. The Coil-glands, termed also Sweat or Sudoriparous glands,are globular coils situated in the subcutaneous tissue and in the deeperportions of the corium. They appear first in the fifth month of foetallife as buds projected downward from the prickle-layer of the epider-mis. Unna demonstrated that these projections always form betweenthe papillae of the corium, and spring from the prolongations of therete between these papillae. Long, thin cones of epithelium thus grad-ually traverse the corium, and become slightly bulbous at the lowerextremity to form later the coil. The lumen, when formed, extendsrapidly to the epidermis, and after this is reached there is made fromwithin outward an opening, which becomes the sweat-pore. Fig. Coil of the sweat-gland : S, tubule lined by cuboidal epithelia; T, central calibre of the tubule;i>, beginning of the duct; C, connective tissue with injected blood-vessels. Magnified 500 diam-eters. (After Heitzmann.) These glands after birth are found in all parts of the body, but incertain regions, such as the axillae, the groins, the palms, the soles,and about the anus, they are either numerous, of unusual size, or pecu-liarly arranged. They are specially numerous in the palms and soles,where, according to Krause, there are between two and three thousandto the square inch. The coil is a convoluted tube terminating in a caecal pouch, linedwith cubical epithelia of granular appearance, which are the secretorycells of the gland. Outside of the tube are muscular fibres runningparallel with or in a spiral direction about the coil. Surrounding bothmuscle-bundles and epithelium is a connective-
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