Q 5: Male Reproductive System Flashcards
What supplies the testes with blood?
Gonadal arteries (can be
What is the pathway for the gonadal arteries?
aorta–>deep inguinal ring–>inguinal canal–>superficial inguinal ring–>spermatic cord
What does the ductus deferens do?
carries sperm up into the ejaculatory ducts from the testes
What does the ductus deferens merge with?
the seminal vesicles
What type of tissue/material is seminal vesicles?
glandular
What is the ejaculatory duct?
portion of pathway from where the seminal vesicles and ductus deferens merge until it meets the prostatic urethra
two ejaculatory ducts exist (bilateral)
Within which structure is the ejaculatory duct located?
prostate
Why do older men take forever to pee?
prostate grows and pinches urethra(?)
Where does the male reproductive system cease to be bilateral?
the urethra
What is found within the prostate gland?
prostatic urethra and ejaculatory ducts
what is the function of the bulbourethral glands (aka Cowper’s Glands)?
neutralize the acidity of urethra
produce less than 5% of semen
what muscle does the prostate gland contain and why?
contains smooth muscle to help with ejaculation
What function does the prostate gland have?
produces 30% of semen
neutralizes acidity of vagina
sm muscle contracts to ejaculate semen
What is semen?
compilation of fluids contributed by the seminal vesicles, epididymis, prostate gland, and bulbourethral glands
Where is the membranous urethra located?
between the prostatic urethra and the spongy urethra
What type of innervation causes STIMULATION the male reproductive system?
Which nerve specifically?
somatic
pudendal nerve
What type of innervation causes ERECTION (aiming for fire) of the male reproductive system?
What nerve specifically?
parasympathetic (lateral horns of S2-S4)
pelvic splanchnic nerves
What type of innervation causes EMISSION (loading bullet) of the male reproductive system? What nerve specifically?
sympathetic, lumbar and sacral splanchnic nerves (
What type of innervation causes EJACULATION of the male reproductive system? What nerve specifically?
somatic, pudendal nerve
What does the central artery of the penis run through?
The corpus cavernosa (one artery on each side)
What does the urethra run through?
The corpus spongiosum
What happens to the dorsal penile veins during erection?
They are squeezed/pinched, allowing blood to remain in the penis for sex o clock
What arteries carry blood to the penis during erection? In what structure of the penis are the arteries found?
central artery of the penis (no viagra needed baby), corpus cavernosa
Where does the nerve impulse that initiates the movement of sperm into the ejaculatory duct originate? A. vagus nerve B. T6 C. L1 D. S3 E. Preaortic plexus
C. L1
1) During ERECTION, through which structures/plexuses are the signals carried through?
2) What nerve initiates the signal?
3) What type of innervation is it?
4) what chemical messenger is used?
5) what happens because of this chemical messenger?
1) (from pelvic splanchnic nerves to) pre-aortic plexus and prostatic plexus to penis
2) pelvic splanchnic nerves (S2-S4 cord level)
- –S2, S3, S4 keeps the penis off the floor
3) parasympathetic
4) NO (Nitric Oxide)
5) vasodilates deep penile arteries, blood fills corpus cav./spong. and dorsal penile veins get pinched
1) During EMISSION, through which structures/plexuses are the signals carried through?
2) What nerve initiates the signal?
3) What type of innervation is it?
4) what chemical messenger is used?
5) what happens in result to the chemical messenger?
1) (from lumbar/sacral splanch. nerves) to pre-aortic plexuses to spermatic tubes
2) lumbar and sacral splanchnic nerves
3) sympathetic
4) NE (norepinephrine)
5) peristaltic contractions of the ductus deferens, seminal vesicles, prostatic smooth muscles & constriction of internal urethral sphincter
What are the contents of seminal vesicles’ contributions to the semen?
produce 70% of volume of semen, fructose, proteins, enzymes
What are the 3 regions of the urethra?
1) prostatic (within prostate)
2) membranous (between prostate and corpus spongiosum/shaft of penis)
3) spongy urethra (within shaft of penis/corpus spongiosum)
What is the prostate gland’s homologous structure in females?
lesser vestibular glands
what is the bulbourethral glands’ homologous structure in female’s?
bartholin’s glands (greater vestibular glands)
What is the term for the head of the penis?
glans penis
What nerve senses STIMULATION of the genitals?
What cord level does this nerve carry the stimulation signal to?
What type of innervation senses the stimuli?
pudendal nerve
pudendal nerve carries the stimuli to S2-S4
somatic (via somatic nerve receptors)
1) During EJACULATION, what cord level does the impulse/signal arise from? is it ventral, dorsal, or lateral?
2) What nerve initiates the signal?
3) What type of innervation is it?
4) What happens in response to this signal?
1) S2-S4, ventral horn
2) Pudendal nerve
3) somatic
4) rhythmic contractions
what muscles rhythmically contract in EJACULATION?
bulbospongiosus muscle (run along shaft of penis)
ischiocavernosus muscles (run back & laterally)
