Process of Oogenesis Germ cells I mitosis Oogonia I Primary oocyte I (46, XX) Maturation of graafian Follicle I Completion of 1st meiotic (meiosis) division. Unequal sharing distribution of cytoplasm I produce one large cell and one small cell Secondary oocyte 1st polar body (Ovum) (23, X), Haploid (23,X ), can’t under go fertilization I Ovulation Not
Oogenesis Process of formation of femal gametes. Oogenesis is initiated in embryonic stage. Oogonia form primordial follicle and development into primary oocyte (at birth oogonia replaced by primary oocyte). Primary oocyte maximum development at 20 week of gestational age, million primary oocyte created. At birth ovary contains around 400,000 primordial follicle which contain primary oocyte. At puberty ovary has about 60,000 primary follicles. Only 400 mature oocyte to ovulate during entire reproductive age. Process of Oogenesis Germ cells I mitosis Oogonia I Primary
Gametogenesis Gametogenesis is production of gametes. Male gametes in male and female gametes in female. Spermatozoon; mature motile sperm cell Spermatozoa; Sperm Ovum(ova); mature egg Oocyte; Developing egg Oocytogenesis; Process of developing oogonia to form primordial follicles into primary oocytes. Form one single oogonium, only one mature oocyte will rise. Oocytogenesis is complete either before or shortly after birth. Forms of Gametogenesis 1. Oogenesis 2. Spermatogenesis
Folliculogenesis Folliculogenesis is the maturation of the ovarian follicle. Ovarian Follicles Medulla contains blood vessels and nerves. Cortex is occupied by developing follicles. Development of follicles stimulated by production of follicle stimulating hormone (FSH) by anterior pituitary gland. Oestrogen is secreted by developing follicular cells and estrogen stimulate ovulation. Structure of Mature Ovum Structure of ovum consist; 1. Zona granulosa 2. Antrum 3. Corona radiata 4. Zona pellucida 5. Oocyte Stages of Follicular Development 1. Follicular stage 2. Luteal stage 1. Follicular stage Oogonia
Ovarian Follicles Medulla contains blood vessels and nerves. Cortex is occupied by developing follicles. Development of follicles stimulated by production of follicle stimulating hormone (FSH) by anterior pituitary gland. Oestrogen is secreted by developing follicular cells and estrogen stimulate ovulation. Structure of Mature Ovum Structure of ovum consist; 1. Zona granulosa 2. Antrum 3. Corona radiata 4. Zona pellucida 5. Oocyte Stages of Follicular Development 1. Follicular stage 2. Luteal stage 1. Follicular stage Oogonia (female germ cell) – follicle formation – primary (form zona
Ovarian Follicles Medulla contains blood vessels and nerves. Cortex is occupied by developing follicles. Development of follicles stimulated by production of follicle stimulating hormone (FSH) by anterior pituitary gland. Oestrogen is secreted by developing follicular cells and estrogen stimulate ovulation. Structure of Mature Ovum Structure of ovum consist; 1. Zona granulosa 2. Antrum 3. Corona radiata 4. Zona pellucida 5. Oocyte Stages of Follicular Development 1. Follicular stage 2. Luteal stage 1. Follicular stage Oogonia (female germ cell) – follicle formation – primary (form zona
Hormone Secreted Through Ovary 1. Estrogen 2. Progesterone 3. Little bit testosterone Estrogen and progesterone are steroid hormone. Estrogen Secreted by growing follicle. Help to stimulate growth of ova. Stimulate ovulation Thickness lining of uterus (endometrium) to prepare pregnancy. Progesterone Progesterone secreted by corpus leuteum in ovary. Prepare the endometrium, lining of uterus for fertilized egg to implant and grow. Required for maintaining endometrium during implantation and pregnancy. Stimulate the formation of alveoli for milk storage in mammary gland and milk secretion. If conception occur,
Hormone Secreted Through Ovary 1. Estrogen 2. Progesterone 3. Little bit testosterone Estrogen and progesterone are steroid hormone. Estrogen Secreted by growing follicle. Help to stimulate growth of ova. Stimulate ovulation Thickness lining of uterus (endometrium) to prepare pregnancy. Progesterone Progesterone secreted by corpus leuteum in ovary. Prepare the endometrium, lining of uterus for fertilized egg to implant and grow. Required for maintaining endometrium during implantation and pregnancy. Stimulate the formation of alveoli for milk storage in mammary gland and milk secretion. If conception occur,
Structure of Ovary One pair gonads in female called ovary. Overy produce ovum. Length 3cm, Width 2cm, Thickness 1cm. Oval in shape, pinkish grey in colour. During ovulation, ovaries releases egg. If sperm fertilized egg, become pregnant. If ovaries released more than one egg result in multiple pregnancy. Location Ovarian fossa is shallow depression on lateral wall of pelvis, where in ovary lie, crossed by obturator nerve and blood vessel. Ovaries located on right and left side of uterus in lower abdomen (lower left and
Ovary One pair gonads in female called ovary. Overy produce ovum. Length 3cm, Width 2cm, Thickness 1cm. Oval in shape, pinkish grey in colour. During ovulation, ovaries releases egg. If sperm fertilized egg, become pregnant. If ovaries released more than one egg result in multiple pregnancy. Location Ovarian fossa is shallow depression on lateral wall of pelvis, where in ovary lie, crossed by obturator nerve and blood vessel. Ovaries located on right and left side of uterus in lower abdomen (lower left and right quadrants
