NROC64H3 Lecture Notes - Lecture 5: Raphe Nuclei, Substance P, Substantia Gelatinosa Of Rolando
19 Oct 2013
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What is the purpose of the vor: counter-clockwise rotation of head results in the clockwise rotation of eyes, medial rectus muscle rotates eye towards the nose, lateral rectus muscle rotates eye away from nose, semicircular canal. Vestibular nucleus connected to: left oculomotor nucleus, contraction of one side and relaxation of other side. Mechanoreceptors differ in their receptive field size: meissner corpuscles are very small. Detailed resolution for what you are touching. Skin slip sensation: grasping things, pacinian corpuscles are much larger. Transient vs sustained firing: transient firing at the beginning and at the end, sustained firing throughout. Meissner vs pacinian corpuscles and their thresholds (slide 9) Two point discrimination influenced by: density of receptors, neural capacity, convergence, receptive field size, special mechanisms. Dorsal root ganglion cell: cluster of neural cells. Primary afferent neurons: four types of axons from skin. C: diameters and speed sizes decrease as you move down the four group types.
