Kalpesh J Gadhvi is teaching live on Unacademy Plus
Human reproduction Presented by Kalpesh Gadhvi
About me Kalpesh gadhvi I am pursuing MBBS from PDU medical college Rajkot My hobbies are to play cricket and listen music You can follow me on unacademy If you like my courses than please rate review recommend and share it . o . .
Oviducts . They are also called fallopian tubes. . They are 10 to 12 cm long, and extend from the ovary to the uterus. . The part of each oviduct lying towards the ovary is funnel shaped, and is called infundibulum.lt has finger-like projections called fimbriae. . The infundibulum leads to the ampulla, and then to the isthmus, which has a narrow lumen opening into the uterus.
Uterus o It is also called womb, and is pear shaped. . It is connected to the pelvic walls by ligaments. . The uterine wall consists of: o External perimetrium o Middle myometrium o Internal endometrium, which lines the uterine cavity . The endometrium undergoes changes during the menstrual cycle.
Cervix and Vagina . The cervix connects the uterus to the vagina. . The cervix and the vagina constitute the birth canal External Genitalia . Consists of: o Mons pubis - Fatty tissue covered by skin and pubic hair o Labia majora - Extends from mons pubis and surrounds the vaginal opening o Labia minora - Fold of skin beneath the labia majora o Hymen Partially covers the vaginal opening o Clitoris - Lies at the junction of labia minora
Mammary glands . Present in all female mammals . It is paired and is glandular. Each breast contains 15 to 20 mammary lobes with alveoli which secrete milk. The alveoli open into the mammary tubules, which unite to form memory duct . Many mammary duct combine to form lactiferous duct
Gametogenesis The testis and ovary produce the male and female gametes respectively by gametogenesis (spermatogenesis in males and oogenesis in females). Spermatogenesis . In males, sperms are produced by the spermatogonia (immature germ cells), which are present in the inner walls of the seminiferous tubules. . Spermatogonia increase in number by mitosis. These are diploid . Some of the spermatogonia called primary spermatocytes periodically undergo meiosis.
Spermatogenesis Spermatogenesis patogonium Spermatozna Secondary spermatocyte Spermatid Pnmary spermatocyte Sertoli cell Spermatogonium Primary spermatocyte Meosis I hy Meiosis I D O Spermatids Mature sperm cells
. After the first meiotic division, two haploid and equal secondary spermatocytesare formed. . These further undergo meiosis to give rise to four haploicd spermatids. . These spermatids are converted into sperms by spermiogenesis. .The sperm head gets embedded in the Sertoli cells after spermiogenesis and is released from the seminiferous tubules by spermiation. . Spermatogenesis starts at puberty by the action of the gonadotropin releasing hormone (GnRH), which in turn causes the release of two gonadotropins called Luteinizing Hormone (LH) and Follicle Stimulating Hormone (FSH). . LH acts on Leydig cells and causes them to release androgens, which stimulate the process of spermatogenesis while the FSH acts on the Sertoli cells, which help in spermiogenesIS.
Structure of a Sperm -Acrosome Head Nucleus Neck- Centrioles Midpiece Mitochondria -Tail Sperm cell
Oogenesis Oogenesis Oogonium Primary oocyte Primary oocyte Primary follicle Meiosis I (m) Polar bh. Ovary Secondary oocyte Ovulation Meiosis Mature follicle Polar body Ovum Ruptured follicle Mature egg cell