Chapter 22, Reproductive System

Home

Get App

Take Quiz

Create

Main male gonad? Female?
- Testes
- Ovaries
Testes are suspended by

spermatic cord
Original location of testes? When do they descend?
- Retroperitoneal
- 1-2 months
Male sex hormone that stimulates testes descent

testosterone
Fibromuscular cord in fetus that guides descent of testes through inguinal canal to scrotal swelling

gubernaculum
Suspend testes in scrotum

spermatic cords
Failure of testes to descend

cryptorchidism
Why do undescended testes fail to produce sperm?

high abdominal temp.
Testes that have not descended by puberty will result in

sterility
Capsule that covers each testis

Tunica Albuginea
At the posterior border of testis where CT thickens into organ forming mass

mediastinum testis
Extensions of mediastinum that seperate testis into lobules

septa
Site of sperm production

seminiferous tubules
Cells that give rise to sperm cells

spermatogenic cells
Where are spermatogenic cells located?

seminiforous tubules
Complex network of channels in mediastinum testis formed by union of seminiforous tubules?

Rete testis
Produce testosterone, located in spaces between seminiforous tubules

interstitial cells
2 cells types in seminiforous tubule epithelium?
- Sertoli cells(sustentacular cells)
- spermatogenic cells
Which cells support, nourish, and regulate spermatogenic cells?

Sertoli cells(sustentacular cells)
Which cells secrete Inhibin?

Sertoli cells(sustentacular cells)
Protein hormone that regulates secreation of FSH?

Inhibin
Where is FSH secreted from?

anterior pituitary gland
What do spermatogenic cells give rise to?

spermatogonia
Type of stem cell, nucleus has 46 chromosomes & 2 sister chromatids per chromosome

spermatogonia
What is spermatogenisis?

Series of events that lead to sperm production
How long does spermatogenisis take?

9 weeeks from spermatogonial to spermiation
Spermatogenisis begins at puberty due to an increase of

testosterone
What happens during spermatogenisis?
- Mitosis
- 2 daughter spermatigonia
- 1 stays at basement membrane
- 1 moves to lumen of seminiforous tubule and becomes primary spermatocyte
What is the genetic makeup of spermatogonia?
- 46 chromosomes
- 2 sister chromatids per chromosome
What is the genetic makeup of primary spermatocyte?
- 46 chromosomes
- 2 sister chromatids per chromosome
- (same as spermatogonia)
When does spermatogenisis arrest?

After primary spermatocyte is formed
What happens during meiosis I?
- chromosomes divide in half, chromatids remain the same
- 2 secondary spermatocytes form
What is a haploid cell?
- 23 chromosomes
- 2 sister chromatids per chromosome
What is the genetic makeup of the secondary spermatocyte?
- 23 chromosomes
- 2 sister chromatids per chromosome
- haploid cell
What happens during meiosis II?
- chromatids divide
- 4 spermatids are formed
Spermatids mature into ______ and are located in the _____ of the seminiforous tubules
- sperm cells
- lumen
What part of the sperm contains a nucleus with 23 chromosomes?

head
What part of the sperm contains enzymes that allow for egg penetration?

acrosome
What part of the sperm contains mitochandria for energy to carry on aerobic respiration and movement?

body
What part of the sperm propels it?

flagellum
stores, nourishes, and promotes sperm cell maturation?

epididymids
Sperm taken from the ______ is nonmotile

seminiforous tubules
How long will it take for sperm to mature and become viable in the epididymis?

18 hours

Author

tville01

139996

Card Set

Chapter 22, Reproductive System

Description

Chapter 22, Reproductive System

Updated

2012-03-06T13:37:20Z