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Pituitary Gland - Anatomy & Physiology (view source)
Revision as of 12:54, 4 June 2011
, 12:54, 4 June 2011no edit summary
During Stage 2 of parturition, the foetus engages the cervix. This initiates a neuroendocrine reflex, '''the Fergusson reflex'''. This is an example of a [[Positive Feedback - Anatomy & Physiology|positive feedback mechanism]], which occurs when stretch receptors in the [[Cervix - Anatomy & Physiology|cervix]] are stimulated. Sensory nerve endings in the cervix are stimulated causing afferent nerve impulses to be sent to the hypothalamus. Neuroendocrine cells of the paraventricular and supraoptic nuclei depolarise and oxytocin is secreted from the pars nervosa. Oxytocin enters the blood circulation and acts on the oxytocin receptors in the myometrium. Uterine contractions therefore, increase in strength and frequency.
During Stage 2 of parturition, the foetus engages the cervix. This initiates a neuroendocrine reflex, '''the Fergusson reflex'''. This is an example of a [[Positive Feedback - Anatomy & Physiology|positive feedback mechanism]], which occurs when stretch receptors in the [[Cervix - Anatomy & Physiology|cervix]] are stimulated. Sensory nerve endings in the cervix are stimulated causing afferent nerve impulses to be sent to the hypothalamus. Neuroendocrine cells of the paraventricular and supraoptic nuclei depolarise and oxytocin is secreted from the pars nervosa. Oxytocin enters the blood circulation and acts on the oxytocin receptors in the myometrium. Uterine contractions therefore, increase in strength and frequency.
==Links==
{{Template:Learning
|flashcards = [[Pituitary_Gland_Flash_Cards_- Anatomy & Physiology|Pituitary gland]]
|full text = [http://www.cabi.org/cabdirect/FullTextPDF/2008/20083156739.pdf ''' Role of catecholamines in regulation of hypothalamo pituitary ovarian axis: a review.''' Phogat, J. B.; Umed Singh; Inderjeet Singh; College of Veterinary Sciences, Haryana Agricultural University, Hisar, India, Haryana Veterinarian, 2007, 46, pp 1-7, many ref.]
}}
[http://www.cabi.org/cabdirect/FullTextPDF/2008/20083156739.pdf ''' Role of catecholamines in regulation of hypothalamo pituitary ovarian axis: a review.''' Phogat, J. B.; Umed Singh; Inderjeet Singh; College of Veterinary Sciences, Haryana Agricultural University, Hisar, India, Haryana Veterinarian, 2007, 46, pp 1-7, many ref. - '''Full Text Article''']