Question

The testis is located in the

• A. abdomen
• B. pelvic cavity
• C. scrotum
• D. thoracic cavity

Answer 1

Answer:

C. scrotum

a. Testes:

• The testes are situated outside the abdominal cavity (Extra abdominal), within a pouch called scrotum.
• The scrotum helps in maintaining the low temperature of the testes (2–2.5⁰C lower than the normal internal body temperature), which is necessary for spermatogenesis.

• Shape of Each Testis: Oval
• Length: 4 to 5 cm
• Width: 2 to 3 cm
• Position: Within scrotum

• The testis is covered by a dense covering.
• Each testis has about 250 compartments called testicular lobules.
• Each Testicular lobule contains 1 to 3 highly coiled seminiferous tubules in which, sperms are produced. 

• Each seminiferous tubule is lined on its inside by two types of cells called

1. 1. Male germ cells (spermatogonia) and
   2. Sertoli cells.

• The male germ cells undergo meiotic divisions finally leading to sperm formation, while Sertoli cells (Nursing cells) provide nutrition to the germ cells.
• The regions outside the seminiferous tubules called interstitial spaces, contain small blood vessels and interstitial cells or Leydig cell.
• Leydig cells synthesise and secrete testicular hormones called androgens. Other immunologically competent cells are also present.