ANSC 340 Lecture Notes - Lecture 26: Zona Pellucida, Acrosome, Spermiogenesis

• School: Chico State University
• Department: Animal Science
• Course: ANSC 340
• Professor: patrickdoyle

Document Summary

Centrioles migrate to opposite sides of nucleus: cap phase (melting over nucleus like hot marble on a stick of butter) Flagellum development begins: acrosomal phase (cid:894)o(cid:271)tai(cid:374)i(cid:374)g (cid:862)sper(cid:373) shape(cid:863)(cid:895) Nuclear/cytoplasmic elongation: maturation phase (finishing touches) Principal (longer piece) terminal (end of tail) Spermiogenesis (spermatid spermatozoa: organize cellular structure (acrosome and tail, acrosomal growth, flagellum growth, package dna (cytoplasm of egg required to unpack dna) Ex: hot marble melting through stick of butter to get to plate. Acrosome reaction: ordered events, release of enzymes to digest zona pellucida polyspermy- too many chromatid. More than one sperm attaches to egg leads to cell death. Spermiation (analogous to ovulation) release of spermatozoa from sertoli cells to lumen of seminiferous tubules. Disulfide bonds between sulfihydryl groups of prota(cid:373)i(cid:374)es (cid:373)akes dna i(cid:374)ert (cid:894)(cid:449)o(cid:374)"t rea(cid:272)t (cid:449)ith outside surroundings) Fertilization= protamines replaced by histones from oocyte cytoplasm. 4. 5 cycles to form spermatozoa (some species variation)