ST NESIS Some of the structures of oogenesis can be observed

Last updated: 6/29/2023

ST NESIS Some of the structures of oogenesis can be observed under the microscope including the primordial follicles with primary oocytes Figure 13 7 The single layer of cells forming the primordial follicles are known as follicular cells As the follicles mature they form primary follicles with granulosa cells forming a layer external to the follicular cells Primary follicles develop further to form secondary follicles in which a central cavity appears called the antrum antrum a cave The antrum is filled with fluid produced by the follicular cells that line it Every 28 days approximately one secondary follicle from either ovary develops into a larger Graafian follicle which surrounds a secondary oocyte The Graafian follicle has a large antrum filled with fluid and several layers of granulosa cells that form the corona radiata A second clear glycoprotein layer the zona pellucida is found between the oocyte and the corona radiata After ovulation the Graafian follicle forms a corpus luteum corpus body luteum yellow The corpus luteum is a source of progesterone and estrogen If fertilization does not occur it soon degenerates to form a corpus albicans alba white which eventually disappears Exercise 6 Structures of the Ovary and Oogenesis 1 Label the structures of the ovary in Figure 13 7 by writing the numbers in the blanks below Germinal epithelium Ovarian ligament Medulla 8 Word Bank Tunica albuginea 7 corpus luteum primordial follicles corpus albicans primary follicles 1900 2 Cortex Granulosa cells Oocyte Developing corpus luteum 3 Figure 13 7 The ovary frontal section secondary oocyte antrum ovulated secondary oocyte secondary follicle Corona radiata Mesovarium and blood vessels 6 4 5 bluedoor LLC