Uterine Cycle Flashcards

Flashcards reviewing the uterine cycle, its phases, and related hormonal changes.

What is the uterine cycle?

A fancy name for the menstrual cycle, focusing on the changes in the uterus over a 28-day period.

Which part of the uterus undergoes changes during the menstrual cycle?

Endometrium (specifically the stratum functionalis layer).

What are the three phases of the uterine cycle?

Menstrual phase, proliferative phase, and secretory phase.

Which days of the cycle encompass the menstrual phase?

Days 1-5 (approximately) of the uterine cycle.

Which days of the cycle encompass the proliferative phase?

Days 6-14 (approximately) of the uterine cycle.

Which days of the cycle encompass the secretory phase?

Days 15-28 of the uterine cycle.

What is the key event during the menstrual phase?

The stratum functionalis detaches from the uterine wall and is shed.

What happens to the stratum functionalis during the proliferative phase?

The stratum functionalis rebuilds and thickens.

What are the main characteristics of the secretory phase?

The stratum functionalis becomes its thickest, and glands secrete nutrients.

Why does the stratum functionalis thicken during the secretory phase?

To prepare the endometrium for potential embryo implantation.

During the secretory phase, what happens to the blood vessels and glands?

The arteries in the functionalis layer are fully formed and the glands secrete nutrients into the lumen of the uterus.

What hormonal changes cause the shedding of the endometrial lining?

Drops in estrogen and progesterone levels.