Male Reproductive Physiology Flashcards
Function of testes?
- Sperm production
- Millions of viable sperm produced each day
- Average time from production to ejaculation is 64 days
- Testosterone production
- Maintains male secondary characteristics
- Controls spermatogenesis
What hormone is responsible for male secondary characteristics?
Testosterone
What hormones are involved in the endocrine control of testicular function?
- GnRH
- Gonadotrophin releasing hormone
- Produced from hypothalamus
- Gonadotrophins
- FSH and LH
- Released from anterior pituitary
- Testosterone
- Released from testicles
Where is testosterone produced?
Testicles
Where is gonadorophin releasing hormone produced?
Hypothalamus
Where are the gonadotrophins produced?
Anterior pituitary
What are the gonadotrophin hormones?
FSH and LH
What effects on other hormones does testosterone have?
Inhibits secretion of GnRH by the hypothalamus
Inhibits secretion of FSH and LH by pituitary
What does FSH and LH stimulate?
Spermatogenesis and testosterone secretion by the testis
What is spermatogenesis?
Production of sperm from the primordial germ cells
What is the average cycle of spermatogenesis?
64 days
What are the 2 phases of spermatogenesis?
- Spermatocytogenesis
- Clonal expansion and maturation through mitotic and meiotic process
- Spermiogenesis
- Differentiation into mature sperm cells
What happens during spermatocytogenesis?
Clonal expansion and maturation through mitotic and meiotic processes
What happens during spermiogenesis?
Differentiation into mature sperm cells
When does spermatogenesis start and for how long does it go on?
Starts from puberty and is lifelong