Sensory responses of dorsal cells in the lamprey brain
Sensory responses were evoked in 17/33 dorsal cells in the brain of the lampreyIchthyomyzon unicuspis by mechanical stimulation of the dorsolateral skin of the sucker and head. Fifteen of the responsive cells tested were classified as pressuresensitive and two as nociceptive. Thus, some of the dorsal cells which are situated in the medulla of the lamprey and which project into the branches of the trigeminal nerves have sensory functions similar to those of dorsal cells in the spinal cord.
KeywordsSpinal Cord Mechanical Stimulation Trigeminal Nerve Sensory Response Sensory Function
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- Clark JDW, Hayes BP, Hunt SP, Roberts A (1984) Sensory physiology, anatomy and immunocytochemistry of Rohon-Beard neurones in embryos ofXenopus laevis. J Physiol (Lond) 348:511–525Google Scholar
- Damas H (1935) Contribution à l'étude de la métamorphose de la tête de la lamproie. Arch Biol 46:171–227Google Scholar
- Finger TE, Rovainen CM (1982) Spinal and medullary dorsal cell axons in the trigeminal nerve in lampreys. Brain Res 240:331–333Google Scholar
- Freud S (1877) Über den Ursprung der hinteren Nervenwurzeln im Rückenmark von Ammocoetes (Petromyzon planeri). SB Akad Wiss Wien 75:15–30Google Scholar
- Martin AR, Wickelgren WO (1971) Sensory cells in the spinal cord of the sea lamprey. J Physiol (Lond) 212:65–83Google Scholar
- Martin RJ, Bowsher D (1977) An electrophysiological investigation of the projection of the intramedullary primary afferent cells of the lamprey ammocoete. Neurosci Lett 5:39–43Google Scholar
- Matthews G, Wickelgren WO (1978) Trigeminal sensory neurons of the sea lamprey. J Comp Physiol 123:329–333Google Scholar
- Northcutt RG (1979) Experimental determination of the primary trigeminal projections in lampreys. Brain Res 163:323–327Google Scholar
- Ronan MC, Northcutt RG (1979) Primary sensory neurons within the medulla of the silver lamprey,Ichthyomyzon unicuspis. Anat Rec 193:667Google Scholar
- Rovainen CM (1967) Physiological and anatomical studies on large neurons of central nervous system of the sea lamprey (Petrymyzon marinus. II. Dorsal cells and giant interneurons. J Neurophysiol 30:1024–1048Google Scholar
- Selzer ME (1979) Variability in maps of identified neurons in the sea lamprey examined by a wholemount technique. Brain Res 163:181–193Google Scholar