The Calgary Guide to Understanding Disease @TheCalgaryGuide
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Menstrual Cycle Physiology: Ovarian Cycle – Ovulation Explained

Around Day 14, estrogen exerts sudden +++ positive feedback
sudden +++ positive feedback ... negative to positive feedback ... MenstrualCycle #OvarianCycle ... pathophysiology #Ovulation #endocrinology
Feedback Loop: Growth Hormone (GH)
Growth Hormone:
 • Liver -> GHR activates JAK-STAT pathway -> Incr IGF1
Feedback Loop: Growth ... metabolic abn #GrowthHormone ... #FeedbackLoop #endocrinology
Menstrual Cycle Physiology: Ovarian Cycle – Brief Overview
LH and FSH are required for follicular development and
MenstrualCycle #OvarianCycle ... #menstruation #endocrinology
Feedback Loop: Prolactin (PRL)
 • PRL levels exhibit diurnal, menstrual, and age-related variation
 • TRH has
Feedback Loop: Prolactin ... #FeedbackLoop #endocrinology
Growth Hormone Excess - Pathogenesis and clinical findings
 • Acromegaly and gigantism share the same pathophysiology
fraction • HTN #GrowthHormone ... signs #symptoms #endocrinology
Menstrual Cycle Physiology: The Hypothalamic-Pituitary-Ovarian Axis
Estrogen, when released:
 • Negatively feeds back on the hypothalamus and
HypothalamicPituitary #endocrinology ... #feedback
Menstrual Cycle Physiology: Ovarian Cycle – Luteal Phase Explained
 • The LH surge can be thought
MenstrualCycle #OvarianCycle ... #LutealPhase #endocrinology
Menstrual Cycle Physiology: Correlating the Ovarian and Uterine Cycles
Note: Some charts show different relative levels of
MenstrualCycle #OvarianCycle ... pathophysiology #comparison #endocrinology
Menstrual Cycle Physiology: Ovarian Cycle – Follicular Phase Explained
Early Follicular Phase (Days 0-5)
 • Granulosa cells
MenstrualCycle #OvarianCycle ... FollicularPhase #endocrinology
Menstrual Cycle Physiology: the Uterine Cycle
The endometrium has receptors for ovarian hormones! Changes in structure and
MenstrualCycle #OvarianCycle ... #UterineCycle #endocrinology