Membrane

(inemr -brat i). In anatomy, a term applied to almost any thin, enveloping or lining substance. In the plural it usually signifies the fetal membranes. M., Adventitious. See Adventitia. M., Albugineous. See Albuginea . M., Amphiblestroid, the retina. M., Animal, a membrane made from animal ti ues, used in dialyzing; also, in the plural, the fetal membranes. M., Arachnoid. See Arachnoid . M. of Arnold, the pigmented layer of the iris. M. of Ascherson. See M., Hap toge no us. M., Bacillar. See M., Jacob's. M., Basement or Basal, in histology, a delicate membrane, made up of flattened cells, and underlying the epithelium of the mucous surfaces. M.-bone, any bone that originates, not in cartilage, but in membrane, such as some of the cranial and facial bones. M., Bowman's. See Bowman. M. of Bruch, a thin, transparent, homogeneous membrane, the external or vitreous lamina of the choroid of the eye. M., Caducous, the decidua. M., Cell, the membrane surrounding a cell; the cell wall. M. of Corti. See Membrana tectoria. M., Costo-coracoid, a dense layer of fascia extending between the sub clavi us muscle and the pectoral is minor, and forming the anterior portion of the sheath of the axillary ve els. M., Crico-thyroid, the triangular membrane connecting the thyroid and cricoid cartilages of the larynx. M., Croupous. See M., Diphtheric. M., Debove's, a deep, germinal layer of flattened cells in the mucosa of the trachea and extra pulmonary bronchi. M. of Descemet. See Descemef s Membrane. M., Diphtheric, a fibrinous layer formed on the surface of mucous membranes and extending downward for a variable depth. It is due to a proce of coagulation-necrosis. The most common cause of its formation is the bacillus of diphtheria; irritant poisons also may produce it. M., Drum. Synonym of the tympanic membrane. M., Elastic, a membrane largely composed of elastic fibrous ti ue. M., Elytroid, the fibers of the cremaster muscle covering the testicle. M., False. See M., Jiphtheric. M., Fenestrated. See Fenestrated Membrane of Henle. M., Fetal, a name given to the chorion, amnion, and allantois. M., Germinal, the blastoderm. M., Gla y, the hyaloid membrane. M., Granular. See Membrana granulosa. M., Hap toge no us, a delicate albuminous pellicle supposed to envelop the fat-globules of milk and of other fluids containing fat and albumin.