Luteal Phase Of The Menstrual Cycle Flashcards
E. Luteal Phase of the Menstrual Cycle
The luteal phase of the menstrual cycle occurs after ovulation. The follicular wall collapses onto itself
and the GC undergo a hypertrophy and hyperplasia; luteinization.
At this time
the part of the follicle that is exposed on the outside of the ovary has a reddish-brown
color from hemorrhaged capillaries. The follicle is now called the corpus hemorrhagicum.
The surface blemish on the ovary from the corpus hemorrhagicum is rapidly covered over by the
tunica albuginea and develops into the CL (Figures 3
10 and 15).
The CL now produces large amounts of progesterone and some estrogen. Increasing concentrations
of progesterone stimulate the previously estrogenized uterus to become secretory.
The glandular epithelium of the endometrium produces copious amounts of nutritive substances that
are transported to the lumen of the uterus in preparation for implantation and pregnancy.
One of the major nutritive substances produced is glycogen that will seve to nourish the implanting
embryo. Histologically
glycogen accumulates in large vacuoles that are located in the basal aspect of
the glandular epithelium of the endometrium.
Progesterone also stimulates the development of the arterial supply to the endometrium
especially
the spiral arteries.