Spermatogenesis Flashcards
define
sequence of events by which primordial germ cells converted to mature sperms
primordial germ cells are
spermatogonia
when
puberty
where
seminiferous tubules of testes
name phases of spermatogenesis
- multiplication
- growth
- maturation
- spermiogenesis
duration
74 days
2 months
multiplication phase
formation of primary spermatocyte from the spermatogonium
are primary spermatocyte n or 2n
diploid 2n
which type of spermatogonium is functional?
type A
which are the largest germ cells?
primary spermatocyte
hormone of spermatogenesis
testosterone
testosterone secreted by
leydig cells in interstitial spaces
supporting cells
Sertoli’s/Sustentacular cells
function of sertoli’s cells
nourishment of sperms and shedding of cytoplasm
location of sertoli’s cells
walls of seminiferous tubules
growth phase
primary spermatocyte enlarges
maturation phase
meiosis 1 - secondary spermatocytes
meiosis 2 - spermatides (immature sperms)
spermatids genome
haploid
proportion of types of sperms
1:1 (half X, half Y)
spermiogenesis
- formation of acrosome
- condensation of nucleus
- formation of neck and tail
- shedding of cytoplasm
acrosome is derived from
golgi apparatus
acrosome secretes
enzymes for fertilization
where is mitochondria
middle piece of tail
passage of sperms after lumen of tubule
epididymis, ductus deferens, urethra
epidiymis
functional maturation and storage of sperm
anterior 2/3rd part of head
acrosome
what is essential for normal spermatogenesis?
Y chromosome
labelled diagram
https://www.google.com/url?sa=i&source=images&cd=&ved=2ahUKEwiF64X-wrPnAhWi34UKHfvECXMQjRx6BAgBEAQ&url=https%3A%2F%2Fwww.toppr.com%2Fask%2Fquestion%2Fdraw-a-diagram-of-a-mature-human-sperm-label-any%2F&psig=AOvVaw2g2I_dFnTlXBCg1jIPM15q&ust=1580755336742146
