The Luteal Phase of the Estrous Cycle Flashcards
what is the dominant hormone in the luteal phase?
P4
what part of the hormone cascade is ovvuring in a preovulatory follicle?
steroid synthesis of progesterone,which produces collagenase which acts on the theca interna
when is the corpus hemorrhagicum present?
1-3 days following ovulation, during metestrus
what is happening in the corpus hemorrhagicum? (4)
- blood vessels in follicle wall rupture
- walls collapse
- cells intermix
- old basement membrane becomes connective tissue of CL
is the corpus luteum larger or smaller than the corpus hemorrhagicum in most species?
larger for most species
what is the corpus luteum made of?
composed of cells from the granulosa and theca interna
what us the hormonal result of the CL?
progesterone production increases
does the small cavity present where the follicular antrum was have any effect on CL function?
no
what does SLC stand for?
small luteal cell
what does LLC stand for?
large luteal cell
where does P4 production take place (an organelle)
in the mitochondria of the CL
what do secretory granules of the CL contain and what is the function?
oxytocin: for cycling
relaxin: during pregnancy
what 2 things contribute to the functional capability of the CL?
- the number of luteal cells
2. vascularization of CL
what happens to large luteal cells in the CL?
they undergo hypertrophy (gorwing in size)
what happens to small luteal cells in the CL?
they undergo hyperplasia (increase in cell number)
what initiates vascularization of the CL?
angiogenic factors from follicle
what does CL vascularity effect?
CL steroid synthesis and delivery of hormones
what is the result of insufficient CL function? why?
failure to maintain pregnancy; won’t have adequate P4