Male Reproductive Anatomy and Physiology: Testes, Spermatogenesis, and Mating

What are the two main functions of the male gonad?

Steroidogenesis (testosterone production) and gametogenesis (sperm cell production).

What is the major male hormone produced by the testicles?

Testosterone.

What are the requirements for successful function of male reproductive anatomy?

Correct steroidogenic conditions and correct temperature conditions.

What are the layers of the scrotum?

Scrotal skin, tunica dartos, scrotal fascia, parietal vaginal tunic, and visceral vaginal tunic.

What is the function of Sertoli cells?

Spermatogenesis (supporting the development of sperm cells).

What do Leydig cells produce?

Testosterone (steroidogenesis).

What is the mediastinum in the testis?

The central connective tissue core that houses the rete testis.

What is the process of spermatogenesis?

The development of sperm cells from spermatogonia through various stages including proliferation, meiotic, and differentiation stages.

What are the stages of spermatogenesis?

Proliferation stage, meiotic stage, and differentiation stage (spermiogenesis).

What is the structure of a spermatozoon?

Head (with acrosome and nucleus) and tail (axoneme and dense fibers).

What is the function of the epididymis?

Storage, concentration, and maturation of spermatozoa.

What is spermiation?

The release of mature spermatids from Sertoli cells into the seminiferous tubule lumen.

What are the accessory sex glands in the male reproductive system?

Vesicular gland, prostate gland, and bulbourethral gland.

What is the function of seminal plasma?

Transport media for sperm, adds fluid volume, provides an environment for sperm viability, and stimulates sperm motility.

What is the role of testosterone in spermatogenesis?

It maintains spermatogenesis and is present in higher concentrations within the seminiferous tubules.

What is the role of GnRH in male reproductive function?

It stimulates the release of LH and FSH from the anterior pituitary.

What is the relationship between LH and testosterone?

LH stimulates testosterone production in Leydig cells.

What happens during the erection of the penis?

The cavernous bodies engorge with blood while venules contract, facilitated by muscle contractions.

What are the three portions of the penis?

Base, shaft, and glans penis.

What is the function of the ischiocavernosus muscle?

It compresses the dorsal veins of the penis to trap blood during erection.

What is the difference between fibroelastic and vascular penises?

Fibroelastic penis is non-expandable with dense connective tissue, while vascular penis is expandable with minimal connective tissue.

What is the process of ejaculation?

A neuroendocrine reflex involving the release of sperm from the male reproductive tract.

What is the significance of temperature regulation in the male reproductive system?

It is essential for proper sperm cell production and overall testicular function.

What happens to sperm during their transit through the epididymis?

They undergo maturation and gain motility and fertilizing capabilities.

What is the role of inhibin in male reproductive physiology?

It causes a decrease in FSH levels.

What is the importance of the acrosome in spermatozoa?

It contains enzymes necessary for penetrating the egg during fertilization.

What is the primary energy source for sperm in seminal plasma?

Fructose.