strongest muscles of the human body. 8WHULQH WXEH 2YDU\ 8WHUXV 8ULQDU\ EODGGHU &OLWRULV /DELXP PLQRUD /DELXP PDMRUD 8UHWKUD )LPEULDH &HUYL[ 5HFWXP 9DJLQD $QXV Fig. . (a) Female pelvis showing reproductive system XII Std Biology-Zoology Chapter- XII Std Biology-Zoology Chapter- Human Reproduction reproductive structures that lie external to the vagina are called as the external genitalia or vulva comprising of labia majora, labia minora, hymen and clitoris .
The Bartholin’s glands (also called greater vestibular glands) are located posterior to the left and right of the opening of the vagina. They secrete mucus to lubricate the vagina and are homologous to the bulbourethral glands of the male. The Skene’s glands are located on the anterior wall of the vagina and around the lower end of the urethra. They secrete a lubricating fluid and are homologous to the prostate gland of the males.
The external opening of the vagina is partially closed by a thin ring of tissue called the hymen. The hymen is often torn during the first coitus (physical union). However in some women it remains intact. It can be stretched or torn due to a sudden fall or jolt and also during strenuous physical activities such as cycling, horseback riding, etc., and therefore cannot be considered as an indicator of a woman’s virginity.
The mammary glands are modified sweat glands present in both sexes. It is rudimentary in the males and functional in the females. A pair of mammary glands is located in the thoracic region. It contains glandular tissue and variable quantities of fat with a median nipple surrounded by a pigmented area called the areola .
Several sebaceous glands called the areolar glands are found on the surface and they reduce cracking of the skin of the nipple. Internally each mammary gland consists of - lobes, separated by fat and connective tissues (Fig. . ).
Each lobe is made up of which help in collection of the ovum after ovulation. The infundibulum leads to a wider central portion called ampulla . The last part of the oviduct is the