acrosomal cap n.
A caplike structure at the anterior end of a spermatozoon that produces enzymes aiding in egg penetration. Also called acrosome, head cap.
- Acrosomal granule
acrosomal granule acrosomal granule n. A large granule that is formed by the coalescing of proacrosomal granules within the acrosomal vesicle and adheres to the nuclear envelope of a developing spermatozoon.
- Acrosomal vesicle
acrosomal vesicle acrosomal vesicle n. A vesicle derived from the Golgi apparatus during spermiogenesis; its membrane adheres to the nuclear envelope of the sperm and, together the the acrosomal granule within the vesicle, spreads in a thin layer over the pole of the nucleus to form the acrosomal cap.
the first sprout appearing in the germination of grain; the developed plumule of the seed. Historical Examples By about the eighth day of flooring the acrospire should be about three-quarters up the corn. Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 4 Various The malting, however, is complete before the acrospire becomes a leaf. A Dictionary […]
a borne at the tip of a sporophore, as a basidiospore.