A fluid- or air-filled cavity or sac, in particular
Either of a pair of vesicles connected with the forebrain of an embryo, from which the optic nerve and retina are developed.
A vesicle formed from a coated pit, concerned with the transport of molecules between organelles in the cell and to and from the cell membrane.
Each of a pair of glands that open into the vas deferens near its junction with the urethra and secrete many of the components of semen
The nucleus of an ovum or oocyte, (in later use) specifically that of a developing oocyte at the stage immediately preceding meiosis.
Another term for blastocyst.
Designating each of the sacs or tubes connected with the circular vessel of the water-vascular system in many echinoderms. Chiefly in Polian vesicle.