Ferguson reflex
Pronunciation: FUR-guh-son REE-fleks
Neuroendocrine response triggered by fetal head pressure on the cervix and vagina, increasing oxytocin release.
Full Definition
The Ferguson reflex is a positive feedback mechanism that occurs during labor when pressure from the fetal presenting part on the cervix and upper vagina stimulates stretch receptors. This stimulation sends signals through the spinal cord to the hypothalamus, triggering increased release of oxytocin from the posterior pituitary gland. The additional oxytocin enhances uterine contractions, which further increases cervical stretching and oxytocin release, creating a positive feedback loop that helps drive the progression of labor. This reflex is an important physiological mechanism for the natural progression of labor and explains why labor often accelerates as the cervix dilates and the fetal head descends. Understanding this reflex is crucial for managing prolonged labor and timing interventions.
Usage
Usage note: Named after James Ferguson; not to be confused with breastfeeding reflexes.
In Context
- "The Ferguson reflex was likely responsible for the sudden acceleration of labor once the cervix reached 8 cm dilation." — Labor progress notes
- "Understanding the Ferguson reflex helps explain why artificial rupture of membranes can sometimes enhance labor progression." — Medical education material