spermatogenesis Flashcards
Testis sits in?
tunica vaginalis, lined by mesothelium cells
veins in spermatic cord are called?
pampiniform plexus
testic is covered by thick fibrous capsule called?
tunica albuginea
seminiferous tubules converge on?
rete testis
Spermatogenesis happens within?
seminiferous tubules
leydig cells produce testosterone from?
cholesterol and acetate
how much testosterone is produced daily?
4 to 10mg
in sertoli cells what happens to testosterone?
converted into dihydrotestosterone by 5 alpha reductase
how long are seminiferous tubules?
30-80cm
what surrounds seminiferous tubules?
peripheral myoid cells for contractility and then basement membrane
in seminiferous tubules there are 2 types of cells?
spermatogenic and sertoli cells
Physiological barrier in seminiferous tubules?
basal and adluminal compartment, gap and tight junctions between sertoli cells
how much spermatozoa are produced?
300 to 600 per gram of testis per second
what happens at puberty in spermatogenesis?
germ cells of immature testis, prospermatogonia, are reactivated to undergo rounds of mitosis
where do prospermatogonia do rounds of mitosis?
basal compartment of tubule
which cells emerge from prosmatogonia?
spermatogonia, produce clone of cells
what emerges from spermatogonia and where do they inhabit?
primary spermatocytes, inhabit cytomplasmic cavities in sertoli cells
meiosis occurs in?
adluminal compartment
secondary spermatocytes quickly form?
haploid spermatids
Unwanted cytoplasm is eaten by what?
sertoli cell
spermatogenic cycle happens every?
16 days
total time for completion of spermatogenesis is?
64 days
where is fluid absorbed and sperm concentrated?
in epididymis
difference in sperm in rete and epididymis?
in rete they twitch, in epididymis they swim, dependent of androgen stimulation
