The Calgary Guide to Understanding Disease @TheCalgaryGuide
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Menstrual Cycle Physiology: Ovarian Cycle – Brief Overview
LH and FSH are required for follicular development and
- FSH from pituitary ... - LH from pituitary ... theca cells • Ovulation ... forms following ovulation ... #menstruation #endocrinology
Feedback Loop: Prolactin (PRL)
 • PRL levels exhibit diurnal, menstrual, and age-related variation
 • TRH has
Prolactin #PRL #FeedbackLoop ... #endocrinology ... pathophysiology #pituitary
Feedback Loop: Growth Hormone (GH)
Growth Hormone:
 • Liver -> GHR activates JAK-STAT pathway -> Incr IGF1
GrowthHormone #GH #FeedbackLoop ... #endocrinology ... pathophysiology #pituitary
Menstrual Cycle Physiology: Ovarian Cycle – Ovulation Explained

Around Day 14, estrogen exerts sudden +++ positive feedback
Ovarian Cycle – Ovulation ... on the anterior pituitary ... pathophysiology #Ovulation ... #endocrinology
Menstrual Cycle Physiology: Ovarian Cycle – Follicular Phase Explained
Early Follicular Phase (Days 0-5)
 • Granulosa cells
production by pituitary ... back on anterior pituitary ... production by pituitary ... preparing for ovulation ... FollicularPhase #endocrinology
Menstrual Cycle Physiology: Correlating the Ovarian and Uterine Cycles
Note: Some charts show different relative levels of
Ovulation • ... See also "Ovulation ... on the anterior pituitary ... • After ovulation ... pathophysiology #comparison #endocrinology
Menstrual Cycle Physiology: Ovarian Cycle – Luteal Phase Explained
 • The LH surge can be thought
slide) Besides ovulation ... hypothalamus and anterior pituitary ... #LutealPhase #endocrinology