Vesicle

[vesf-ik-l) [vesicula, dim. of vesica, bladder]. I. A small bladder; especially a small sac containing fluid. V., Allantoic, the internal hollow portion of the allantois. V., Auditory, an ectodermic sac, a part of the cerebral vesicle, from which the internal ear is formed. V., Blastodermic. See Blastoderm. V., Cerebral, an expansion of the anterior extremity of the neural tube of the embryo, subsequently forming the brain. V., Germinal, the nucleus of the ovum. V., Graafian. See Follicle, Graafian. V., Optic, a hollow proce of the cerebral vesicle forming the e ential part of the eye. V., Otic. See V., Auditory. V., Seminal, one of the two little sacs situated at the base of the bladder and serving as reservoirs for the semen. V., Umbilical. See Yolk-sac. VESICO- 2. A small blister on the skin, as, e. g., an herpetic or small-pox vesicle. 656