Human Anatomy Testes and Scrotum

Study Notes

Anatomy of the Testes

Testes are located outside the abdominal cavity within a pouch known as the scrotum.
The scrotum regulates the temperature of the testes, maintaining it 2-2.5°C lower than the normal body temperature, which is essential for sperm production (spermatogenesis).

Structure and Dimensions

Each adult testis is oval, measuring approximately 4-5 cm in length and 2-3 cm in width.
The testis is enveloped in a dense covering for protection.

Testicular Lobules and Seminiferous Tubules

Each testis contains roughly 250 compartments termed testicular lobules.
Within each lobule are 1 to 3 highly coiled seminiferous tubules, which are the sites of sperm production.

Cell Types within Seminiferous Tubules

Seminiferous tubules are lined with two key cell types:
- Male germ cells (spermatogonia) that undergo meiotic divisions to form sperm.
- Sertoli cells that nourish the germ cells during their development.

Interstitial Spaces and Leydig Cells

The areas outside the seminiferous tubules are known as interstitial spaces, which contain:
- Small blood vessels for nutrient and waste transport.
- Interstitial cells, commonly known as Leydig cells.
Leydig cells are responsible for synthesizing and secreting androgens, which are testicular hormones vital for male reproductive function.

Additional Cellular Presence

Other immunologically competent cells are present within the interstitial spaces, playing a role in the immune response within the testes.

Description

This quiz covers the structure and function of the testes, including their location within the scrotum and the importance of temperature regulation for spermatogenesis. Learn about the anatomical features, such as the testicular lobules and their role in reproductive physiology.