Flashcards in Physiology Deck (71)
What promotes the conversion to testes?
What do seminiferous tubules produce?
What cells secrete testosterone?
When do the testes descend into the scrotum?
Shortly befor birth
Define Tunica Albiginea
Fibrous capsule of the testes
Define Tunica Vaginalis
Surrounding the seminiferous tubules
Egg-shaped structures outside the abdominal cavity in the scrotum
Where do the testicular arteries branch from?
What helps to cool off the warm blood from the testicular arteries?
When do the testicles descend?
7-12 weeks fetal life
7-9 months fetal life
Why is testicular descent important?
Risk of hernias
Increased risk of testicular cancer
Function of the Scrotum
Muscles that Affect the Surface Area of the Scrotum
Dartos muscle (wrinkles)
Site of Sperm Production
Path of Sperm from Testes to Vagina
Vas deferens (Ductus deferens)
How do sperm move from the efferent ducts to the epididymus?
Secrete fluid high in fructose (energy for sperm to swim)
Excrete prostaglandins: increases muscle contraction & helps with cervical mucus
70% of semen fluid
Add fluid to the semen (make it more alkaline)
2 Issues with the Prostate Gland
Bulbourethral Glands (Cowper Glands)
Helps to become more alkaline
Where does seminal fluid come from?
Shaft that ends in a tip
Define Glans Penis
Tip of the penis
Loose skin of the penis shaft folds to cover the glans
Portions of the Penis
Hormone Path to Leydig Cells
Testosterone (negative feedback loop)
Hormone Path to Sertoli Cells
Inhibin (negative feedback loop)
Endocrine Function of the Testes
Differentiation of male genital tract during fetal development
Induces development of primary and secondary sex characteristics
Promotes spermatogenesis & maturation of sperm
Testosterone on Development of Primary & Secondary Sex Characteristics
External genitalia & accessory organs
Male voice timbre
Male skin characteristics
Male hair distribution