Tag: the reproductive system

In human males, the testes are situated outside the abdominal cavity within a pouch called scrotum. These type of testes is called extra-abdominal. Scrotum helps in maintaining the low temperature of the testes than the normal body temperature. It is necessary for sperm formation. But there are certain mammals in which the testes descend into scrotum only during breeding season. These mammals breed seasonally. Bat and otter are the examples of these mammals.

In human males, the testes are situated outside the abodominal cavity within a pouch called scrotum. These type of testes is called extra-abodominal. Scrotum helps in maintaining the low temperature of the testes than the normal body temperature. It is necessary for sperm formation. But there are certain mammals in which the testes remain permanently in the abdomen and does not cause any defect. Scrotum in absent in these mammals. Examples are elephant, aquatic mammals like whales, dolphins, seal and prototherians or egg-laying mammals like Ornithorhynchus.

Testes is the primary sex organ in human males. The testes are situated outside the abdominal cavity within a pouch called scortum. In adults, each testis is oval in shape, with a length of about 4 to 5 cm and width of about 2 to 3 cm. The testis is covered by a dense covering. They are enclosed in an outer tough capsule of collagenous connective tissue, the tunica albuginea. It is a protective layer.

Spermatogenesis is the process by which the formation of sperm which is the male gamete takes place and it is carried out in the tiny tubes like structure in seminiferous tubules of testes.

Testes are extra-abdominal in position. The testes are situated outside the abdominal cavity within a pouch called scrotum. The scrotum helps in maintaining the low temperature of the testes ($2 – 2.5^o$ C lower than the normal internal body temperature), which is necessary for spermatogenesis. The slightly cooler temperature of the scrotum is necessary for the development of normal sperm. So, the testes start their development in the abdominal cavity. But during the 7^th month of the foetal life, they descend into the scrotal sacs in presence of testosterone hormone.

To ensure the survival and growth of the sperms, testes have been placed outside the abdominal cavity within a pouch called scrotum so as to ensure the optimal temperature. The scrotum helps maintain the low temperature (by about 2-2.5 degrees than the normal body temperature) required for spermatogenesis. So, the correct option is '2.0−2.5o C lower than the normal body temperature'.

• In the case of premature delivery, $8^{th}$-month) of a male baby the testis are situated in because of testes descent into the scrotum outside the body just before birth.
• The testis is placed outside the body in scrotum because The scrotum helps in maintaining the low temperature of the testes (2–2.5°C lower than the normal internal body temperature) necessary for spermatogenesis. 
• So, the correct answer is "Abdominal birth'.