<P> The corona radiata is the innermost layer of the cells of the cumulus oophorus and is directly adjacent to the zona pellucida , the outer protective glycoprotein layer of the ovum . Its main purpose in many animals is to supply vital proteins to the cell . It is formed by follicle cells adhering to the oocyte before it leaves the ovarian follicle , and originates from the squamous granulosa cells present at the primordial stage of follicular development . The corona radiata is formed when the granulosa cells enlarge and become cuboidal , which occurs during the transition from the primordial to primary stage . These cuboidal granulosa cells , also known as the granulosa radiata , form more layers throughout the maturation process , and remain attached to the zona pellucida after the ovulation of the Graafian follicle . For fertilization to occur , sperm cells rely on hyaluronidase ( an enzyme found in the acrosome of spermatozoa ) to disperse the corona radiata from the zona pellucida of the secondary ( ovulated ) oocyte , thus permitting entry into the perivitelline space and allowing contact between the sperm cell and the nucleus of the oocyte . </P>
<P> The corona radiata is the innermost layer of the cells of the cumulus oophorus and is directly adjacent to the zona pellucida , the outer protective glycoprotein layer of the ovum . Its main purpose in many animals is to supply vital proteins to the cell . It is formed by follicle cells adhering to the oocyte before it leaves the ovarian follicle , and originates from the squamous granulosa cells present at the primordial stage of follicular development . The corona radiata is formed when the granulosa cells enlarge and become cuboidal , which occurs during the transition from the primordial to primary stage . These cuboidal granulosa cells , also known as the granulosa radiata , form more layers throughout the maturation process , and remain attached to the zona pellucida after the ovulation of the Graafian follicle . For fertilization to occur , sperm cells rely on hyaluronidase ( an enzyme found in the acrosome of spermatozoa ) to disperse the corona radiata from the zona pellucida of the secondary ( ovulated ) oocyte , thus permitting entry into the perivitelline space and allowing contact between the sperm cell and the nucleus of the oocyte . </P>
which follicle stage is characterized by the development of a corona radiata
which follicle stage is characterized by the development of a corona radiata
the transition from the primordial to primary stage
the transition from the primordial to primary stage