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Definition of spermatogenesis
formation of sperm cells
what is the basic structural unit of the testicle?
seminiferous tubules
What are the phases in order?
multiplication, growth, maturation, transformation, liberation
describe multiplication phase
PGCs travel into testicle and transform from Type A spermatogonia to Type B spermatogonia by mitosis
what are PGCs?
primordial germ cells
describe growth phase
Type B spermatogonia transform into primary spermatocytes by mitosis, meiosis 1 starts
describe maturation phase
primary spermatocytes transform to secondary spermatocytes by meiosis 1. Secondary spermatocytes transform to early spermatids by meiosis 2
what occurs during transformation phase
nucleus decreases, golgi apparatus forms acrosome, centrioles form flagellum. spermatid is now spermatazoa
describe liberation phase
spermatazoa (sperm cells) are released into the lumen of the seminiferous tubule (spermiation)
Where are the most mature sperm cells located?
in the center of the seminiferous tubule (lumen)
what is semen composed of?
spermatazoa and seminal plasma
what is the most mature form of a sperm cell?
spermatazoa
what is the most immature form of a sperm cell?
spermatagonia
how does a normal sperm cell move?
only forward
at least ___% of sperm cells should be normal
60
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Flashcard (59)