Study Notes: The Reproductive System

The Reproductive System

The Prostate Gland

The prostate gland is a walnut-sized gland located below the urinary bladder in males. It surrounds the upper part of the urethra and plays a crucial role in the male reproductive system.

• Function: The prostate secretes a slightly alkaline fluid that forms part of the seminal fluid, which nourishes and transports sperm during ejaculation.

• Enlargement (Benign Prostatic Hyperplasia): The prostate may become enlarged due to age-related hormonal changes, leading to urinary symptoms such as difficulty starting urination, weak stream, or frequent urination.

• Other Causes of Enlargement: Prostate enlargement can also be due to prostatitis (inflammation) or prostate cancer.

Glands and Vesicles of the Male Reproductive System

The male reproductive system contains several accessory glands that contribute to the formation of semen.

• Seminal Vesicles: Paired glands that secrete a viscous, alkaline fluid rich in fructose, which provides energy for sperm.

• Prostate Gland: Secretes a milky, slightly alkaline fluid that enhances sperm motility and longevity.

• Bulbourethral (Cowper's) Glands: Secrete a clear, lubricating mucus that neutralizes traces of acidic urine in the urethra.

Secretions:

• Seminal vesicles: Fructose, prostaglandins, and clotting proteins.

• Prostate: Citric acid, enzymes, and prostate-specific antigen (PSA).

• Bulbourethral glands: Mucus and alkaline fluid.

Female Reproductive Organs

The female reproductive system consists of both internal and external organs that function in the production of gametes, fertilization, and support of fetal development.

• Ovaries: Produce ova (eggs) and secrete hormones such as estrogen and progesterone.

• Uterine (Fallopian) Tubes: Transport ova from the ovaries to the uterus; site of fertilization.

• Uterus: Muscular organ where implantation and development of the embryo/fetus occur.

• Vagina: Muscular canal that receives the penis during intercourse and serves as the birth canal.

• External Genitalia (Vulva): Includes the labia, clitoris, and vestibular glands.

Functions of Myometrium and Endometrium

The uterus is composed of three layers: the perimetrium (outer), myometrium (middle), and endometrium (inner).

• Myometrium: The thick, muscular middle layer responsible for uterine contractions during menstruation and childbirth.

• Endometrium: The inner mucosal layer that thickens in preparation for implantation of a fertilized egg and is shed during menstruation if implantation does not occur.

Example: During labor, the myometrium contracts rhythmically to expel the fetus, while the endometrium provides the initial site for embryo implantation and supports early pregnancy.