Vesicle

(ves'-ik-l). In biology, a small, membranous, bladder-like formation. See also Papule. V., Allantoic, the internal portion of the allantois. V., Auditory, the sac in the fetus from which the internal ear is formed. V. of Baer. the ovum of the Graafian vesicle. V.of Balbiani. Same as Yolk-nucleus. V., Blastodermic. See Blastoderm . V., Blood. A Blood-corpuscle. Vs., Cerebral. Same as Vs., Encephalic. Vs., Encephalic, the divisions of the cephalic extremity of the primitive neural tube; they are formed early in fetal life and constitute the protons of the segments of the brain. V., Germinal. See Macula and Zona pellucid a. ' V., Gland. Same as Acinus. Vs., Graafian, the ovisacs of the ovary containing the ova. V., Kupffer's. See Kupffer. V., Malignant. Synonym of Contagious Anthrax. Vs. of Naboth. Same as Ozule of Xaboth, a. v. V., Ocular, a protrusion in die fetus that is the first indication of the eye. V., Olfactory, the primitive vesicle which develops into the olfactory lobe. V., Otic, a pear-shaped, closed sac of the embryonic inner ear formed by the fusion of the lips of the auditory pit, and giving rise by a diverticulum to the rece us vestibuli. See V., Auditory. V., Pituitary, the primitive vesicle which develops into the hypophysis. V. of Purkinje. See Macula . V., Seminal, the tabulated pouches of a membrane between the base of the bladder and the rectum that serve as reservoirs for the semen. V., Umbilical. See Yolk-sac.