Biology for ( Grade 10 )

(iv) Vagina (v) Glands

(i) Ovaries : These are oval shaped lying near the kidney.

• Ovary is covered by two layers outer is made up of germinal

epithelial cells.

• Inner layer is called as tunica albuginea which is made up of fibrous

connective tissues.

• The ovary consists of inner part called as stroma.


• It’s outer peripheral pat is called as cortex while inner part is called a

medulla.

• Medulla consists of connective tissues containing numerous blood

vessels, lymphatic vessels and nerves.

• Cortex consists of graffian follicles in all the stages of development.
  The developing oocyte is called as primary oocyte

This primary follicle undergoes maturation to form

secondary follicle or secondary oocyte

It later on forms follicular layer

This follicular layer undergoes mitotic

division to form secondary egg membrane.

This stage is called as secondary follicle

This is called as graffian follicle

FLOW CHART SHOWING THE FORMATION OF GRAFFIAN

FOLLICLE

• Cortex also consists of large mass of yellow cells termed as corpus
  luteum, formed in an empty graffian follicle after the release of it’s
  ovum.
  
  
  • The cells of corpus luteum secrete the hormones
    (A) progesterone during pregnancy. (B) Relaxing at the end of