Study sheet: Ferguson Reflex in Labor

📋 Course Outline

1. Ferguson Reflex Mechanism
2. Role in Labor

📖 1. Ferguson Reflex Mechanism

🔑 Key Concepts & Definitions

• Ferguson reflex : Wikipedia — A positive feedback reflex initiated by pressure-induced stretching of the internal cervix or vaginal walls during labor, ultimately increasing uterine contractions until delivery.

📝 Essential Points

• The Ferguson reflex proceeds from mechanical stretch detection by sensory neurons, transmission through the dorsal horn and anterolateral columns to the brain, hypothalamic stimulation of the posterior pituitary, oxytocin release, and myometrial contraction. — Wikipedia

• The contractions produced by oxytocin further increase cervical pressure, reinforcing the reflex in a self-sustaining positive feedback loop until delivery occurs. — Wikipedia

💡 Memory Hook

Cervical stretch → oxytocin release → stronger contractions → greater stretch

📖 2. Role in Labor

🔑 Key Concepts & Definitions

• Fetal ejection reflex : The involuntary process in which powerful uterine contractions can expel the baby without active pushing by the mother when conditions are optimal.

📝 Essential Points

• During labor, the density of oxytocin receptors in the uterus can increase dramatically, making the uterus highly responsive to oxytocin.

• As uterine contractions push the baby down the birth canal, additional oxytocin is released and produces powerful involuntary contractions that can expel the baby without active maternal pushing.

💡 Memory Hook

Involuntary fetal ejection contrasts with active maternal pushing