. A practical treatise on diseases of the skin, for the use of students and practitioners. helia 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-tissue membrane. Theglomerulus, or coil, is globular in outline and reddish-yellow in the larger glands irregular dilatations and constrictions of the tubeare conspicuous. ANATOMY AND PHYSIOLOGY OF THE SKIN 43 The excretory duct of the coil-gland passes from the
. A practical treatise on diseases of the skin, for the use of students and practitioners. helia 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-tissue membrane. Theglomerulus, or coil, is globular in outline and reddish-yellow in the larger glands irregular dilatations and constrictions of the tubeare conspicuous. ANATOMY AND PHYSIOLOGY OF THE SKIN 43 The excretory duct of the coil-gland passes from the glomerulusbelow to the epidermis above, in a straight or a spiral course. It islined with a delicate hyaline cuticle (discovered by Heynold), beneathwhich is a double layer of cuboidal epithelium. Externally is a rneni-brana propria, unprovided with muscular fibres. Its outermost sheathis the usual connective-tissue layer. When the duct reaches the border-line of the epidermis its inner cuticle and external connective-tissuesheath are both lost; here it becomes the sweat-pore. Fig. BP The sweat-pore traversing the epithelial layers of the skin: BP, papilla with injected blood-vessels; V, valley between two papillae; D, duct in the rete mucosum; E, E, epidermal layer;PL, coarsely granular epithelia, deeply stained with carmine; P, duct with corkscrew-windingsin the epidermal layer. Magnified 200 diameters. (After Heitzmann.) The Sweat-pore is a continuation of the excretory duct of thecoil-gland after the loss of its cuticle and connective-tissue sheath. Itis the loss of these sheaths and the consequent intimate relation of thecanal to the epithelia of the epidermis that furnish the special basis forthis distinction. The sweat-pore is merely a wall-less canal or chan-nel, spirally directed or running a straight course from the duct of thecoil-gland below to the outermost stratum of the epidermis above. Ithas no other wall than that formed by the cells of the prickle-layerbe
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Keywords: ., bookauthorhydejamesnevins184019, bookcentury1800, bookdecade1890
