At approximately day 1

Ovary weight is approximately 15 mg.

Reference [PubMed Link]

Rabinovici J, Jaffe RB. 1990. Development and regulation of growth and differentiated function in human and subhumand primate fetal gonads. Endocrine Reviews 11(4):532-557.

At approximately day 1

Primary oocytes become associated with precursor granulosa cells. Folicular development begins and intensifies after week 16.

Duration: 7 weeks

Reference [PubMed Link]

Rabinovici J, Jaffe RB. 1990. Development and regulation of growth and differentiated function in human and subhumand primate fetal gonads. Endocrine Reviews 11(4):532-557.

At approximately day 1

Oogenesis: Pachytene stage (chromosomal crossover) occurs. In human oocytes there is a relatively high rate of synaptic errors during this stage, with a high rate of germ cell death as a result.

Duration: 9 weeks

Reference [PubMed Link]

Rabinovici J, Jaffe RB. 1990. Development and regulation of growth and differentiated function in human and subhumand primate fetal gonads. Endocrine Reviews 11(4):532-557.