A manual for the College of Surgeons in London, Dublin, and Edinburgh: intended for the use of candidates for examinations and practitioners / [John Steggall].

  • Steggall, John, 1795?-1871.
Date:
1839
Catalogue details

Licence: Public Domain Mark

Credit: A manual for the College of Surgeons in London, Dublin, and Edinburgh: intended for the use of candidates for examinations and practitioners / [John Steggall]. Source: Wellcome Collection.

    769/788 (page 311)
    SECRETIONS, 31] surface are ramifications of an artery, vein, nerve, and absorbent. The serous, synovial, and mucous membranes present the most simple forms of secreting surfaces. In the more complex organs, secretions are poured out from the walls into reservoirs, which are named according to their shape’: Ist, there may be a small pit or depression, named acrypt; 2d, this may be surrounded on all sides and constitute a vesicle or cell ; 3d, this cell may be contracted at one end like the neck of a bottle, and is named a follicle; 4th, the follicle may be elongated uniformly , without presenting the neck and_ broader portion, and is named a cecum or pouch ; 5th, the pouch may be still more elongated, and constitute a tube (tubulum),. In all these forms, the fluid is considered to be elabo- rated in the capillary arteries on the walls of the secreting organ; not to be poured out by vessels terminating in open mouths, but to pass from the arteries through the membrane by a power of transudation, named exosmose. Secretion of tears. The tears are secreted by the lacrymal gland, from whence they are conveyed by six or seven excretory canals to the upper and outer part of the eye, where they pass through the conjunctiva, and are carried by a triangular canal, formed bya meeting of the eyelids, to the inner canthus of the eye; here they are absorbed by the puncta lacrymalia, and conveyed by two tubes to the lacrymal sac. From the lacrymal sac the tears pass by the nasal duct into the inferior meatus of the nose. The tears keep the cornea moist, moderate the friction of the eyelids on the eyes, and wash away any extraneous bodies which may have fallen into the eye. Secretion of milk. The milk is secreted in the glan- dular substance of the mamme. The tubulj lactiferi commence in numerous small portions, called lobules, As they approach the nipple, the ducts unite into twelve or fifteen of considerable size, which terminate on the surface of the nipple by open mouths. a Secretion of bile. The bile is secreted in the liver by _ the minute branches of the vena portee into the lobules, ale Y at