UTRICLE

n. U2t'ri2-k'l. Lat., utriculus (dim. of uter, a leathern bag). Fr., utricule. Ger., Schlauch (1st def.), Hautfrucht (3d def.), Schlauchfrucht (3d def.i. Syn.: sinus communis (2d def.). 1. A little pouch or bag, especially a membranous, closed, sac-like part or organ, [a, 35.] 2. The larger of the two vesicles into which the otic vesicle of the embryo is divided by a constriction which at last shuts it off from the saccule. [A, 5.] 3. A fruit in which the pericarp is like a bladder around the seed; of Gartner, a cystidium (2d def.). [o, 35.] Primordial u. 1. The membrane of a cartilage cell directly in contact with the cell. 2. A thin layer of pro to lining described by Hensen as the membrane of the red Elasmlood-corpuscles of the Amphibia, connected by delicate fibrils with a similar protoplasmic layer surrounding the nucleus. [J, 22, 35.] 3. A layer of protoplasm first deposited upon the inner surface of the wall of a cell, [a, 35.] U. of the prostatic portion of the urethra. See UTERUS masculinus. U. of the vestibule. The yestibular cavity which connects with the semicircular canals. It is imbedded in the rece us elliptic us, and communicates with the semicircular canals by five foramina. It is attached to the wall of the bony vestibule by loose connective ti ue. It is surrounded by perilymph and contains endolymph. It consists of a fibrillar subs tanti a propria bounded externally by vascular connective ti ue and internally by angular pavement epithelium. [F, 32.] [s. 683]