Somatic Sensory System Flashcards
1
Q
Pseudo-unipolar neurons
A
Exclusive to sensory neurons
No dendrites, only axons!
2 AXONAL BRANCHES: 1 extends towards PNS (muscles) and 1 extends towards CNS (spinal cord)
2
Q
The largest-diameter sensory afferent axon neurons are those that supply the ____ to _____.
A
sensory receptors to the muscles
3
Q
Smaller arborizations result in…
A
smaller receptive fields
4
Q
What determines the size of the receptive fields? (2)
A
- The branching characteristics of the afferent (arborization size)
- Density of afferent fibers supplying the area.
5
Q
Receptive fields in regions with dense innervation (fingers, lips, toes) are ___
A
small
6
Q
Two-point discrimination (def.)
A
the min interstimulus distance required to perceive two simultaneously applied stimuli as distinct.
7
Q
Two-point discrimination for fingertips
A
2mm
8
Q
Two-point discrimination for forearm
A
40mm
