Lecture 8

Question 1

types of tactile ( touch ) receptors

Answer 1

Meissner : ( superficial )
Merkel : (superficial)
Parcinian: (deep)
Ruffini: (deep)

Question 2

Pain and Temperature receptor

Answer 2

Free nerve ending
Pain: everywhere except for brain ( superficial )
A fiber : large and myelinated ( quick, sharp pain)
C fiber: axon smaller diameter, Unmyelinated
dull aching pain

Temperature : all of skin ( superficial)

Question 3

Muscle receptor

Answer 3

Muscle spindle : located in muscle belly
Golgi tendon organs : muscle tendon

Question 4

Extrafusal vs intrafusal muscle fiber

Answer 4

Intrafusal: part of mm spindel ( detect change in length )
extrafusal : skeletal muscle fiber: Muslce tension for movement

Question 5

Muscle spindle

Answer 5

detect rate of change in length ( Dynamic) / normal length ( static)
1A afferent neuron ( static + dynamic )
Group 2 afferent neurons ( static)

Question 6

Gorgi tendon organs

Answer 6

Muscle contract, tendon gets tighter
press down onto golgi tendon organ
detect amount of force being produced.
1B afferent ( sensory ) neuron

Question 7

Intrafusal muscle fiber:

Answer 7

nuclear chain fiber : position (static)
Static nuclear bag fiber ( static
Dynamic nuclear bag fiber ( dynamic )

Question 8

Alpha gamma co activation

Answer 8

innervate intrafusal fiber : tighten up muscle spindle and maintain sensitivity when the muscle is contracting (dual command)
Fire at the same time as alpha motor neuron when contracting

Question 9

Meissner and pacinian

Answer 9

Fast adapting receptor
dynamic
more sensitive to change in stimulus

Question 10

Markel and ruffini

Answer 10

slow adapting
static
always sensitive to presence of stimulus

Question 11

Markel and ruffini

Answer 11

slow adapting
static
always sensitive to presence of stimulus