Week 2-2

Question 1

divergence

Answer 1

a single neuron synapses on multiple neuron

Question 2

convergence

Answer 2

multiple neuron converge on fewer neurons (alpha motor neron)

Question 3

extrafusal

Answer 3

skeletal

Question 4

intrafusal

Answer 4

muscle spindles

Question 5

afferent

Answer 5

to the CNS

Question 6

efferent

Answer 6

away from the CNS

Question 7

where is the cell body located

Answer 7

dorsal root ganglion

Question 8

sensory afferent labeling

Answer 8

afferent are labels based on cross sectional diameter I largest IV smallest

Question 9

what does conduction depend on

Answer 9

diameter

Question 10

larger diameter =

Answer 10

faster conduction

Question 11

Group 1a (primary)

Answer 11

muscle spindles
length and velocity

Question 12

Group II

Answer 12

length or (static length of the muscle)

Question 13

do muscle spindles lie in parallel or series the the skeletal muscle

Answer 13

parallel

Question 14

what is the shape of a muscle fiber

Answer 14

football (fusiform shaped)

Question 15

why do hand muscle have a higher density of spindles?

Answer 15

the hands are important for fine motor task and we dont know what length and where the muscle are in space

Question 16

bag 1

Answer 16

dynamic (length change of the muscle

Question 17

bag 2

Answer 17

static (coding for the static length)

Question 18

chain

Answer 18

static (coding for the static length)

Question 19

afferent type 1A

Answer 19

primary (length and velocity of stretch)
innervate bag 1,2 and chain

Question 20

type II

Answer 20

secondary static length
innervates bag 2 and chain

Question 21

la primary send info from

Answer 21

all muscle spindles rectors

Question 22

II secondary send info from

Answer 22

static receptors (bag 2 and chain)

Question 23

how do we record?

Answer 23

microneurigraphy (single unit action potential with needle)

Question 24

what happens when the stretch gets quicker

Answer 24

the action potential get closer together (Ia are firing faster)

Question 25

plateaus in the middle

Answer 25

have a faster firing rate because of the length tension relationship

Question 26

as the length of the muscle decreases the

Answer 26

AP rate also decreases

Question 27

what does the tendon tap activate

Answer 27

primaries Ia they are very sensitive to vibration and taps and can stop firing on release

Question 28

what is the efferent system of the motor neuron called

Answer 28

gamma system

Question 29

E alpha motor neurons send info to

Answer 29

extrafusal muscle fibers (skeletal)

Question 30

E gamma motor neurons send info to

Answer 30

muscle spindles

Question 31

dynamic gamma sends info to

Answer 31

Bag 1

Question 32

static gamma sends info to

Answer 32

bag 2 and chain

Question 33

why do we have the gamma motor system

Answer 33

maintains sensitive of the spindle when there is slack in the muscle and prevents the spindle from coming unloaded

Question 34

gamma dynamic makes the spindle

Answer 34

more velocity sensitive

Question 35

gamma static makes the spindle

Answer 35

more length sensitive

Question 36

co activation

Answer 36

alpha and gamma are at the same time

Question 37

without co activation

Answer 37

the muscle would become unloaded so it will not fire while it is shortened