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Nursing Physiology and Anatomy
Typology: Lecture notes
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Internal Structures o Ovaries The ovaries are the ultimate life-maker for the females. It has an estimated length of 4cm and width of 2cm and is 1.5cm thick. It appears to be shaped like an almond. It looks pitted, like a raisin, but is grayish white in color. It is located proximal to both sides of the uterus at the lower abdomen. For its function, the ovaries produce, mature, and discharge the egg cells or ova. Ovarian function is for the maturation and maintenance of the secondary sex characteristics in females. It also three divisions: The protective layer of epithelium The cortex The central medulla o Fallopian Tubes The fallopian tubes serve as the pathway of the egg cells towards the uterus. It is a smooth, hollow tunnel that is divided into four parts: The interstitial (1 cm in length) The isthmus (2 cm in length) The ampulla (5 cm in length) The infundibular (2 cm long and shaped like a funnel) The funnel has small hairs called the fimbria that propel the ovum into the fallopian tube. The fallopian tube is lined with mucous membrane, and underneath is the connective tissue and the muscle layer. The muscle layer is responsible for the peristaltic movements that propel the ovum forward. The distal ends of the fallopian tubes are open, making a pathway for conception to occur.
o Uterus The uterus is described as a hollow, muscular, pear-shaped organ. It is located at the lower pelvis, which is posterior to the bladder and anterior to the rectum. The uterus has an estimated length of 5 to 7 cm and width of 5 cm. it is 2.5 cm deep in its widest part. For non-pregnant women, it is approximately 60 g in weight. Its function is to receive the ovum from the fallopian tube and provide a place for implantation and nourishment. It also gives protection for the growing fetus. It is divided into three: The body The isthmus The cervix The body forms the bulk of the uterus, being the uppermost part. This is also the part that expands to accommodate the growing fetus. The isthmus is just a short connection between the body and the cervix. This is the portion that is cut during a cesarean section. The cervix lies halfway above the vagina, and the other half extends into the vagina. It has an internal and external cervical os, which is the opening into the cervical canal. External Structures o Mons Veneris The mons veneris is a pad of fat tissues over the symphysis pubis. It has a covering of coarse, curly hairs, the pubic hair It protects the pubic bone from trauma. o Labia Minora The labia minora is a spread of two connective tissue folds that are pinkish in color. The internal surface is composed of mucous membrane and the external surface is skin. It contains sebaceous glands all over the area. o Labia Majora Lateral to the labia minora are two folds of fat tissue covered by loose connective tissue and epithelium. Its function is to protect the external genitalia and the distal urethra and vagina from trauma. It is covered in pubic hair that serves as additional protection against harmful bacteria that may enter the structure. o Vestibule It is a smooth, flattened surface inside the labia wherein the openings to the urethra and the vagina arise. o Clitoris The clitoris is a small, circular organ of erectile tissue at the front of the labia minora. The prepuce, a fold of skin, serves as its covering. This is the center for sexual arousal and pleasure for females because it is highly sensitive to touch and temperature.