ANAT 321 Lecture Notes - Lecture 2: Blurry, Neurotransmitter, Ganglion
20 Dec 2017
School
Department
Course
Professor
Document Summary
Construct sensation of texture: different sensations, brain combine information coming from multiple. Axons innervating skin surface ending project into spinal cord/brain stem project ap from arm to. Spinal cord but not all sensory neurons same. Classified by a) how fast neurons propagate ap & b) how thick/diameter & whether myelinated/not: thickness of axon fiber = Speed up rate of ap propagation: myelination around axon fiber = *speed influenced by axon"s thickness / presence + thickness of myelin. Ex: a fi(cid:271)ers =100m/s & c fibers = 0. 5m/s. Sensory neuron fibers carry information from periphery pns to cns: a & a fibers = large diameter/well-myelinated fibers so fast. Correspond to specialized sensory endings [pacinian corpuscles] & responsible for fine touch + Proprioception + vibration: a & c fibers = small diameter/thinly myelinated or un-myelinated fibers so slow. Correspond to free nerve endings & responsible for pain + temp sensation. Stimulus within this receptive field will excite the.
