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/lp/bioscientifica/the-afferent-pathway-of-the-milk-ejection-reflex-in-the-mid-brain-of-cvMGZnLPOb
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- Publisher
- Bioscientifica
- Copyright
- Copyright © 1972 The Authors. All Rights Reserved.
- ISSN
- 0022-0795
- eISSN
- 1479-6805
- DOI
- 10.1677/joe.0.0520333
- Publisher site
- See Article on Publisher Site
Abstract
SUMMARYThe position of the pathway for the release of oxytocin in the mid-brain was ascertained by exploration of a transverse stereotaxic plane (A4) in 23 anaesthetized goats. Electrical stimulation was applied between a monopolar electrode and an indifferent electrode in the scalp. Oxytocin release was monitored by simultaneous collection of blood samples during stimulation from a catheter in a jugular vein. The blood samples were extracted by the Sephadex G-25 or fuller's earth method and assayed for oxytocin content on the lactating guinea-pig preparation.Oxytocin release occurred occasionally after stimulation of certain sites in the tectum, central grey and reticular formation. Regular releases of oxytocin, however, were only obtained after stimulation of a pathway which was compact and lay in the lateral tegmentum of the mid-brain in association with the spinothalamic tract. The position of this pathway corresponds to that described previously for the afferent pathway of the milk-ejection reflex in the mid-brain of the guinea-pig and rabbit. In these three species therefore, the impulses concerned in oxytocin release appear to ascend through the mid-brain in the spinothalamic tract.
Journal
Journal of Endocrinology – Bioscientifica
Published: Feb 1, 1972