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BIOLOGY 2C03 (138)
Kim Dej (45)
Lecture

Somatosensory I I

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Department
Biology
Course
BIOLOGY 2C03
Professor
Kim Dej
Semester
Fall

Description
Outline of Lecture 25 (02-26 A; Johnson) Somatosensory I I. Basic terms used in somatosensory systems - Receptor zone  transmission zone  synaptic zone - Neural image - Divergence vs. convergence - Receptive vs. projective field - Adaptation: rapid vs. slow adaptation - Specificity: to specific forms of energy and to specific modalities - Population response - Neural coding - Sensation vs. perception II. Afferent nerve fiber types (see also table on p. 7!!!) - Afferent peripheral nerves can be divided into 4 groups: I-IV (or A-α, A-β, A-δ, C), in order of decreasing axon diameter/conduction velocity (see chart on p. 3 for function) A) Mechanoreceptors afferents: all A-β except for low threshold C - SAI (aka Merkel): bottom of sweat duct ridges, form and texture perception - SAII (aka Ruffini): skin stretch (e.g. hand shape, lip/mouth position) - RAI (aka Meissner): grip control -
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