. A practical treatise on diseases of the skin, for the use of students and practitioners . a Bpecies of minute valvule is formed hy thoseplates of the horny layer superimposed upon the superior portionof the duet. The orifices of the sweat-glands called poresare in places visinle to the unaided eye, in the furrows betweenthe papillary ledges. Under the microscope, the anatomicaldifferences between the coil and the duct are seen to dependupon the existence in the former of cuboidal, and in the latter,as tar as the rete, of columnar epithelia, both attached to adeiicate hyaline membrane. In the
. A practical treatise on diseases of the skin, for the use of students and practitioners . a Bpecies of minute valvule is formed hy thoseplates of the horny layer superimposed upon the superior portionof the duet. The orifices of the sweat-glands called poresare in places visinle to the unaided eye, in the furrows betweenthe papillary ledges. Under the microscope, the anatomicaldifferences between the coil and the duct are seen to dependupon the existence in the former of cuboidal, and in the latter,as tar as the rete, of columnar epithelia, both attached to adeiicate hyaline membrane. In the empty condition of thegland the calibre of the tubule is narrow, and the cement ledgeof the epithelia is plainly visible at the surface bounding thecalibre. A basket-like plexus of vessels has been already de-scribed as surrounding each in the connective tissue capsule ofthe gland. Here also are smooth muscle iibres, chiefly conspic-uous in the axilla?. The diameter of the duct at its outset does not, according toIleitzmann, exceed that of the lobule within the coil. It soon, Fig. Coil of the Bweal gland. S, tubule lined by cuboidal epithelia; T, central calibre of thetubule; Z>, beginning of the duct; C\ connective tissue with injected bloodvessels. Maguifiedmeters. (After Heitzmann.) however, widens and shows a single stratum of columnar epi-thelia. Delicate longitudinally arranged bundles of connectivetissue accompany the duct, though no smooth muscle bundles THE ODOROUS EMANATIONS FROM THE SKIN. 39 are present. The latter leads in a slightly devious course to adepression between two papillae, and is here composed of strati-fied epithelia representing a formation of the rete prolongedwithin it to a varying depth. After reaching the epidermallayer, the duct is lined by a single row of flat epithelia, itscalibre widening considerably at its orifice upon the surface ofthe skin. The sudoriparous glands of the foetus are seen about the fifthmonth of intra-uterine life, a
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Keywords: ., bookcentury1800, bookdecade1880, bookidpracticaltre, bookyear1883
