Each ovary is composed of a cluster of egg or ovarian tubes, the
ovarioles,
each
consisting of a
terminal filament
, a
germarium
(in which mitosis gives rise to primary oocytes), a
vitellarium
(in which oocytes grow by deposition of yolk in a process known as vitellogenesis)
and a
pedicel
. An ovariole contains a series of developing oocytes each surrounded by a layer of
follicle cells forming an epithelium (the oocyte with its epithelium is termed a follicle), the youngest
oocytes occur near the apical germarium and the most mature near the pedicel.
The different types of ovariole is based on the manner in which the oocytes are nourished.
Dostları ilə paylaş: