Obstetric and also Newborn care I > great > lesson 01: Reproductive Anatomy and also Physiology > 1.10 masculine Reproductive Organs

a. Testes (Two).

The testes are two almond-shaped glands whose features are for the production of sperm and testosterone.

You are watching: Why are the male testes located in the scrotum, outside the abdominopelvic cavity?

The testes space suspended in the scrotal sac exterior the abdominopelvic cavity. It is believed that the testes lie external the body cavity due to the fact that they are an extremely sensitive come heat and the higher temperature in ~ the human body is unfavorable come the production of sperm.

Each testis is enclosed by a tough, white fibrous capsule called the tunica albuginea. Extension of the capsule divides it into a huge number of lobes. Every lobe contains four strict coiled seminiferous tubules (this is the location of actual sperm production). The seminiferous tubules empty sperm right into the testicular network wherein they travel to the epididymis. The epididymis is located exterior of the testis (see figures 1-8 and 1-9).

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Figure 1-9. Structure of the testes.

b. Duct System.

The duct system is the passageway because that the sperm to exit the body. It has the epididymis and also the vas deferens. (1) Epididymis. The epididymis is a coiled tube about 20 inches long. It caps the superior component of the testis and runs under its posterior side. It creates the an initial part that the duct system and also provides a short-term storage site for immature sperm.

When the masculine is sexually stimulated, the walls of the epididymis contract come expel sperm into the next part of the duct system. (2) Vas deferens (ductus deferens). The sperm continue their journey through the vas deferens. The vas deferens runs upwards indigenous the epididymis through the inguinal canal into the pelvic cavity and also arches over the bladder (see figure 1-8). The is enclosed with blood vessels and also nerves in a connective tissue sheath, which is referred to as a spermatic cord. The vas deferens empties right into the ejaculatory duct the carries the sperm v the procedure to empty right into the urethra.

c. Accessory Glandular Structure.

The accessory glandular structure includes the seminal vesicles, prostate gland, Cowper’s glands, and the penis.

(1) Seminal vesicles. The two seminal vesicles are pouches that store sperm. Sixty percent of fluid volume of semen (seminal fluid) is created there. The secretion is well-off in sugar (fructose), which nourishes and activates the sperm passing v the tract.

(2) Prostate gland. The prostate gland is a solitary gland around the size and also shape of a chestnut. It encircles the top area of the urethra just listed below the bladder. That secretes a milky alkaline fluid, which has the duty in protecting the sperm versus acid conditions of the vagina.

(3) Cowper’s glands. The cowper’s glands space tiny pea-sized glands worse to the prostate. They type a thick, clear mucus, i m sorry drains right into the urethra. The secretion is believed to serve primarily as a lubricant during sexual intercourse.

(4) Penis. The prick is a cylinder-shaped organ located externally on the mons pubis, immediately above the scrotum. That is do of erectile tissue through cavern-like spaces in it. At the time of sexual excitement, blood fills these spaces, changing the soft, limp penis to an enlarged, rigid, erect organ.

The smooth lid of the penis is called the glans penis and is spanned by a fold of loosened skin that develops the headlock foreskin. Surgical removal that this foreskin, called circumcision, is typically performed. The penis additionally serves as part of the urinary tract in the male.


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