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1A groove, ridge, or seam in an organ or tissue, typically marking the line where two halves fused in the embryo, in particular.
- ‘If the variant is bilateral the deviant muscle plate has a raphe in the median line.’
- ‘They are located close to the median raphe, ventromedial to the hypoglossal nucleus.’
- ‘Its fibers pass dorsally from an extensive anterior attachment to insert on the pharyngeal raphe, the pharyngeal tubercle of the occipital bone.’
- 1.1The connecting ridge between the two halves of the medulla oblongata or the tegmentum of the midbrain.
- ‘Because most medullary raphe neurons that project to motoneurons are inhibited by vagal afferents.’
- ‘Second, there is a midbrain trigger, perhaps in serotonergic neurons of the dorsal raphe.’
- ‘In rats, the CO2-sensitive neurons of the caudal medullar raphe act during sleep only.’
- ‘Stimulation of 5 - HT1A receptors in the raphe regulates serotonin synthesis and release.’
- ‘The second pathway arises from the median raphe and enervates the hippocampus and appears to mediate resilience and adaptation to stress.’
- 1.2Botany A longitudinal ridge on the side of certain ovules or seeds.
- ‘The raphe is a slightly depressed area on the opposite side of the hilum from the micropyle.’
- 1.3Botany A longitudinal groove in the valve of many diatoms.
- ‘Through the raphe, the living diatom secretes mucilage, with which it may attach to a substrate or move by gliding over the substrate.’
Mid 18th century: modern Latin, from Greek rhaphē seam.
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