27
Primordial follicles
Theca folliculi
Primary
oocyte
Forming
antrum
Theca
folliculi
Zona pellucida
Zona
pellucida
Antrum
Antrum
Secondary oocyte
Secondary oocyte
Corona radiata
Primary follicle
Mature vesicular follicle carries out
meiosis I; ready to be ovulated
2
3b
3a
4
5
6
6
7
1
2
Secondary follicle
3a
Late secondary follicle
3b
4
Follicle ruptures; secondary oocyte
ovulated
5
Corpus luteum (forms from
ruptured follicle)
6
Figure 27.20
Schematic and microscopic views of the ovarian cycle: development and fate of ovarian follicles.
The numbers on
the diagram indicate the sequence of stages in follicle development, not the movement of a developing follicle within the ovary. During stage
7
(no
photomicrograph), the corpus luteum degenerates into the corpus albicans. No primordial follicle (
1
) is shown in the central schematic view.
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