Flashcards in Male Reproduction, Sperm, Tumescence and Climax Deck (40):
What are the testicular appendix a remnant of?
Paramesonephric ducts (Mullerian)
What is the glandular capsule of the testis?
Where do Leydig cells reside?
In the extracellular space
Structure of Sertoli cells?
Highly irregular with nucleolus always having two smaller satellite bodies
Sertoli cells function?
Forms the blood-testis barriers forming tight junctions; separate gametes from blood
What is the primary stimulating hormone for Sertoli cells?
What do Leydig cells do?
Produce testosterone in the presence of LH
Progression of sperm maturation?
What stage of sperm are found in the basal compartment?
What stage of sperm are found in the adluminal compartment?
Where do Sertoli cells rest?
On the basement membrane
Why does only one sperm enter the oocyte?
Once sperm penetrates zona pellucida and fuses with oolemma the ovum releases granules into the perivitelline space preventing the binding of additional sperm and causes additional sperm to fall off, also the oocyte membrane because electrically depolarized fending off additional sperm
As the testis move from the abdomen to the scrotum they pick up layers and change names, what are the layers from deep to superficial?
Peritoneum-> tunica vaginalis
Transversalis fascia and aponeurosis-> internal spermatic fascia
Internal oblique abdominus muscle-> Cremaster muscle and fascia
External oblique abdominis aponeurosis-> External spermatic fascia
Superficial abdominal fascia (Camper's fascia)-> Dartos muscle and fascia
Perineal skin-> Scrotum
What does the spermatic cord consist of?
What occurs vascularly for an erection to occur?
Blood rapidly enters the cavernous bodies causing swelling and pressure on the deep dorsal vein collapsing it
Ventral and dorsal side of the penis?
Ventral is the back of the penis
Dorsal is the front when flaccid
What controls blood flow to the penis?
Both PSNS and SNS
What relays sensory information from the back half of the scrotum and perineum?
Bulbourethral gland function:
Prostate gland secretions contents:
Major anion in seminal plasma (function not known)
Important fro sperm swimming and acrosome reaction
Enzyme action, binds many types of proteins
Acid phosphatase function:
Neutralizes acid pH of semen and vaginal/cervical secretion
Seminal vesicle secretion contents:
Energy for sperm swimming
Contraction of female reproductive tract
Spermatogonia mitose to primary spermatocytes-> 1st meiotic division to secondary spermatocytes-> 2nd meiotic division to spermatid (only mature to spermatozoa)
What do Sertoli cells release in response to how many sperm are bound to its surface?
What is inhibin?
A negative feedback substance for FSH
What drives spermatogenesis and allows more spermatocytes to be bound to Sertoli cells?
What supplies the dorsum of the penis with innervation?
What are two ways an erection can occur?
Physical stimulation directly sent from pudendal to brain
Sensory information to the mammillary bodies and efferent signals to penis
What nerves act when flaccid?
Sympathetic neural tone by releasing norepinephrine causing contraction and not allowing too much blood flow to the penis
What nerves act when erection occurs?
Parasympathetic by releasing Ach causing vasodilation
What is released causing tumescence?
Increased cGMP causing dilation
What roots are the PSNS nerves?
What occurs during ejaculation?
Sympathetic stimuli cause contraction of ischiocavernosal and bulbocavernosal muscle with peristaltic contractions of epididymides and all the ducts
Path of sperm in reproductive tract: