Reproductive-Mace Flashcards
Production of Gametes:
Occurs in ____ for males
Occurs in _____ for females
Testes-> sperm (n)
Ovaries-> ovum (n)
Gametes are produced by:
**Meiosis of germ cells:
Meiosis of germ cells in males=
Spermatogonium (2n)
Meiosis of germ cells in females=
oogenium (2n)
what is the importance of Meiosis (aka production of gametes) ?
- Reducing the # of chromosomes
- **No info lost
Fertilization occurs in the _______
fallopian tubes
Fertilization produces:
Zygote (2n)
Importance of fertilization?
Restore # of chromosomes to diploid state (2n)
Female Gonads and Sex Hormones:
- Hypothalamus releases:
- Ant Pituitary releases:
- GnRH
- FSH and LH
female gonads= ovaries
Ovarian follicle contains which hormone?
estrogen
Corpus luteum consists of which hormone?
progesterone**
Male Gonads and Sex Hormones:
- Hypothalamus releases:
- Ant Pituitary releases:
- GnRH
- FSH and LH
Male gonads= testes
Testes produce _____
–interstitial cells produce _______
sperm, (& make testosterone)
interstitial cells produce testosterone
The _________ is the gonad and the ________ is the gamete.
Testis; ovary Testis; semen Testis; sperm Sperm; semen Semen; sperm
Testis; sperm
Development starts in the ______
**yolk sac
Genital ridges form at ___ weeks
6
At ___ weeks, differentiation starts
12
Development summary:
Starts in yolk sac-> genital ridges (6 wks)-> 12 wks differentiation starts
20 weeks differences
Development of fertilized egg:
when are “actual differences” seen?
20 weeks
which chromosome indicates Male sex?
Y chromosome
What does the Y chromosome provide?
**TDF= testes determining Factor
when a fertilized egg is developing, what sex hormones will result in the development of a Male? What is producing these hormones?
Testosterone & MIF/AMH (Mullerian inhibiting Factor)
-**BOTH produced by the testes
Testosterone induces the development of _______
mesonephric duct
MIF/AMH: fx? (what does it inhibit)
Inhibits female
development
Fetal development:
What is the “default system”? What does this result in?
- no action of embryo needed
- NO sex hormone production [ie: no T & MIF] –> so default to female sex
- **Paramesonephric duct (Mullerian Duct)
what is the primary sex organ of Males?
testis
What is the exocrine function of testis?
endocrine fx?
EXO:
sperm
ENDO:
Testosterone
Testis: location?
outside of body cavity-> scrotum
Testicular temperature regulation is controlled by: (2 muscles)
Tunica cremaster-> abdominal muscles extension
Tunica dartos: smooth muscle-> wrinkle skin
Testis Structure:
-External–> Tunica vaginalis covers _____
epididymis
Testis Structure:
-internal covering of testis=
**Albuginea =fibrous CT that reaches deep internally-> creates lobules for seminiferous tubules
What stimulations would cause the testis to be brought closer to the body to increase their temperature?
- SNS activation
- Cold temp
T or F:
The temperature of the scrotum/testis should always be a little bit HIGHER than core body temperature
False. should always be slightly lower than core body temp
Male Pelvic Region: describe
- tetsis are located?
- immature sperm will enter _____, upon stimulation it will enter _______
bulbourethral glands emit ______ upon stimulation
Testis are outside the body, immature sperm will enter the epididymis–> upon stimulation it will enter vas deferens–> and ampulla of the ductus deferens merges with the seminal vesicles and the ejaculatory duct in the prostate– ejaculatory duct merges with the urethra in the prostate–> as the urethra leaves the prostate–> enters urogenital diaphragm= membranous urethra.
Bulbourethral glands– emit an alkaline mucous into the spongy urethra upon stimulation and this allows for control of pH and bacteria so the sperm successfully leave the body
Male Genitalia: consists of ______
- testis
- epididymis
- Ductus Deferen (vas deferens)
- Penis
- Seminal vesicle, Prostate gland, Urethra, scrotum
function of spermatic cord?
provide protection to blood flow (testicular artery & pampiniform plexus) & protection of vas deferens
Spermatic fascia=
this is fascia around the spermatic cord & its contents that goes all the way up into the body
Pamniform plexus drains the _____
spermatic cord
Spermatic cord is flanked by the _______ muscle
cremaster
Development of sperm in the seminiferous tube:
summary
Spermatogonium is located right on the outside of the smooth muscle layer on the outside of the seminiferous tubule. The smooth m will contract and enhance the movement of cells as they differentiate-– down towards the seminiferous tube
Spermatogonium–> goes through mitosis (creates 2 separate primary spermatocytes which have 46 pairs of chromosomes–> surrounded by susentacular cells (=Sertoli cells) they tightly fuse on the developing spermatocyte to create a tight junction–> Meiosis 1 (split down to secondary spermatocyte (with 23 pairs)–> also increase cytosol of spermatocyte–> Go through meiosis 2 and produce 4 spermatids (23 singles)–> these spermatids are pushed through the tight junction into the lumen–> this process= spermatogenesis!
Pay attention to= blood testis barrier–> not exactly a structural formation its more created by susentacular cells (aka Sertoli cell barrier) which helps to est. different chemical environments
–it blocks lymphocytes, it blocks complement, it can be problematic cuz lymphocytes may attack spermatids AND WE DON’T WANT THIS. We need to produce sperm
Blood testis barrier prevents….?
antibodies in the blood from getting to the germ cells
The \_\_\_\_\_\_\_ has/have no androgen receptors and do not respond to it. Germ cells Muscular tissue Sustentacular cells Hypothalamus Pituitary gland
Germ cells
(notes: Blood testis barrier prevents antibodies and lymphocytes, and variety of hormones from entering so they cant disrupt the germ cells that are developing)
List the 3 parts of the urethra (in males)
- prostatic urethra
- Membranous urethra
- Spongy (penile) urethra
From their formation to ejaculation, sperm cells take the following pathway.
- Seminiferous tubule, epididymis, rete testis, urethra, ejaculatory duct, ductus deferens.
- Seminiferous tubule, epididymis, rete testis, ejaculatory duct, ductus deferens, urethra.
- Seminiferous tubule, epididymis, rete testis, ductus deferens, ejaculatory duct, urethra.
- Seminiferous tubule, rete testis, epididymis, ductus deferens, ejaculatory duct, urethra.
- Seminiferous tubule, rete testis, epididymis, ejaculatory duct, urethra, ductus deferens.
-Seminiferous tubules (in testes), rete testis, epididymis, ductus deferens, ejaculatory duct, urethra.
(my summary: Testisincluding the seminiferous tubules–> rate testis epididymis ductus deferens–> ampulla of seminal vesicle seminal vesicle comes together w ejaculatory duct to deliver seminal fluid ampulla at the seminal vesicle deposits sperm coming up through ductus deferens you are now in the ejaculatory duct at the beginning of the prostate now inside the prostate gland where prostatic fluid is deposited int the prostatic urethra now in the urogenital diaphragm–> membranous urethra bulbourethral gland deposits bulbourethral secretion into the urethra–> spongy urethra goes for bulb of penis into outside world )
Male internal accessory organs nurture and _____ sperm cells
transport**
List the Male internal accessory organs:
Epididymides
Ductus deferentia
Prostate gland
Urethra
Bulbourethral glands
Ejaculatory ducts
ED PUBE= internal
Epididymis= tightly coiled tubes located ______
-connected to ______
**At the top of each testis
-Connected to ducts within the testis
Epididymis: fx?
Promote maturation of sperm cells
Ductus Deferentia aka ______
vas deferens
Vas deferens are muscular tubes about ___cm each
45cm
Vas deferens: each extends from the _______ to the ________
epididymis to the ejaculatory duct
the Vas deferens is covered in which epithelia?
-pseudostratified columnar epith, and smooth muscle** (for peristalsis)
Seminal Vesicles:
-each is attached to the ______
-vas deferens near base of the urinary bladder
Seminal Vesicles:
-secrete? (**3 things)
- alkaline fluid
- fructose
- prostaglandins
Seminal Vesicles:
-it’s contents empty into the ______
ejaculatory duct
Prostate Gland surrounds the proximal portion of the ______
urethra
The ducts of the prostate gland open into the _____
urethra
Prostate Gland: secretes ______
**a thin, milky, alkaline fluid
Prostate gland secretions enhance _______
**sperm mobility
Prostate gland is composed of:
- _____ glands in CT
- _____ muscle
- tubular glands in CT
- Also contains smooth muscle