MEMBRANE

of a hair. hyaline m. 1. The membrane between the outer root-sheath and the inner fibrous layer of a hair-follicle. 2. The basement-membrane. hyaloid m., a delicate membrane investing the vitreous humor of the eye. hyothyroid m. Sameasthyrohyoid. intero eous m. Sce membrana intero ea. inter sutural m., the pericranium that lies between the cerebral sutures. ivory m., membrana eboris. Jackson’s m., a delicate curtain or web of adhesions (by some regarded as a sheet of peritoneum) sometimes seen covering the cecum and producing obstruction of the bowel and a series of definite symptoms. Called also membranous per i colitis. Jacob’s m., the layer of rods and cones of the retina. keratogenous m., the nail matrix. Kélliker's m., the membrana_ reticulata. Krause’s m., a membrane supposed to separate the disks of sarcous matter in the striated muscles. meconic m., a layer within the fetal rectum. medullary m., the endosteum. mucocutaneous m., a membrane that is partly mucous and partly cutaneous, like that of the tympanum. mucous m., a membrane composed of epithelium upon a basement-membrane with a subcutaneous ti ue, lining those canals and cavities of the body which communicate with external air, such as the alimentary canal and its branches, the respiratory tract and its connections, and the genito-urinary tract. Nasmyth’'s m., a membrane covering the enamel of an unworn tooth. nictitating m., the so-called third eyelid of various animals, as the horse. nuclear m., the outer layer of the nucleoplasm. obturator m., the tough layer that closes the obturator foramen. olfactory m., the schneiderian membrane. ovular m., the vitelline membrane. palatine m., the membrane covering the roof of the mouth. per i colonic m., a membrane pa ing from the serosa of the abdominal wall to the colon. Cf. Jackson’s membrane, Treves’ fold, etc. per i dental m., periodontal m. See per i cementum. _ peri-orbital m., the periosteum of the orbit. pharyngeal m., the membrane that closes the oral end of the embryonic gut. pleuropericardial m., the membrane which separates the heart and the lung-sac in the embryo. pro liger ous m., the discus pro liger us. pseudo serous m., a membrane which looks like a serous membrane, but differs from it in structure. pupil- m., a delicate membrane closing in the fetal pupil and disappearing about the seventh or cighth month of fetal life. purpurogenous m., the pigment epithelium of the eye. Pyogenic m., a membrane which produces pus. pyophylactic m., a fibrinous membrane lining a pus-cavity and tending to prevent the reabsorption of injurious materials. vier’s m., Rénaut’s layer. See layer, Reichert’sm. See Bowman's m. Rei ner’s m., a thin membrane between the cochlear canal and the scala vestibuli. reticulated m., the net-like covering of the organ of Corti. ruyschian m., the ent och oroide a. Scarpa’s m., the membrana tympani secund aria. schneiderian m., the mucous membrane which lines the nose. semipermeable m., a membrane which permits the pa age of a solvent, such as water, but prevents the diffusion of molecules of the di olved substance. serous m., the lining membrane of any one of the great splanchnic or lymph-cavities. Shrapnell’s m., the thin upper part of the membrana tympani. spore-m. See sporocyst. striated m., the zona radiata. sub enamel m., a membrane said to exist be tween the enamel pulp and the enamel of a tooth. sub epithelial m., the basement-membrane. subzonal m., the outer layer of the amnion. synovial m., a membrane that secretes synovia. Synovial membranes are of three kinds: articular synovial m’s, or those that line the cavities of a joint, forming the synovial capsule: bursa synovial m's, or those that line bursa mucose; and vaginal synovial m's, or those that line tendon- sheaths, forming synovial sheaths. tarsal m., the palpebral cartilage. Tenon’s m. See Tenon's capsule. thyrohyoid m., the membrane which connects the thyroid cartilage and the hyoid bone. tympanic m., the membrana tympani. undulating m., a _ protoplasmic membrane running like a fin along the body of certain protozoa. utero-epichorial m., the decidua vera. virginal m., the hymen. vitelline m., the external envelop of the ovum. vitreous m. Same as Bruch's m. Volkmann's m., a thin, yellowish membrane studded with miliary tubercles which lines the fibrous wall of a tubercular absce . Wachendorf’s m. 1. The pupillary membrane. 2. The membrane which invests a cell. yolk-m., the vitelline membrane. ’s m., the ectiris, or anterior layer of the iris.