Descending pathways from the hypothalamus to the medulla and spinal cord. Observations on blood pressure and bladder responses
✍ Scribed by S. C. Wang; S. W. Ranson
- Publisher
- John Wiley and Sons
- Year
- 1939
- Tongue
- English
- Weight
- 950 KB
- Volume
- 71
- Category
- Article
- ISSN
- 0021-9967
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✦ Synopsis
The efferent pathways from the hypothalamus have been investigated by a number of workers. Previously, investigators have held that the central sympathetic pathway descends through the dorsomedial part of the reticular formation and the medial longitudinal f asciculus (Fulton, '29 ; Beattie, Brow and Long, '30; Spiegel and Hunsicker, '36). Lately, a different opinion has been voiced by Magoun, Ranson and Hetherington ( '38)' namely that the hypothalamic descending connections occupy a wide area in both the central and tegmental region of the mesencephalon and the teapenturn of the pons.
As to the central connections for bladder responses Barrington ('25) found that bilateral lesions in the cat interrupting the region ventromedial to the superior cerebellar peduncle at the level of the pons caused partial retention of urine. It has been found on stimulating the brain stem that the reactive points for bladder responses are located in the periventricular gray and tegmentum of the mesencephalon (Kabat, Magoun and Ranson, '36) and in the ventrolateral portion of the lateral reticular formation in the medulla (Wang and Ranson, '39).