Lec 1-3 - Muscle and its Innervation

Question 1

antigravity muscles

Answer 1

extensors

Question 2

muscles with same action at a joint

Answer 2

synergists

Question 3

resisting forces of gravity

Answer 3

posture

Question 4

elimination of unwanted movement at a joint

Answer 4

postural fixation

Question 5

postural fixation example

Answer 5

have to hold hands in the right place in able to use the fine motor skills of typing

Question 6

can different types of muscle fibers be changed from one to the other with training?

Answer 6

nope

Question 7

alpha motor neurons are aka

Answer 7

LMN

Question 8

if motor neurons die, axons die and muscles blank

Answer 8

atrophy

Question 9

true atrophy only occurs in diseases like blank

Answer 9

polio, ALS

Question 10

spontaneous twitches of motor fibers as muscle is dying

Answer 10

fasciculations

Question 11

single motor neuron and all of the muscle fibers it innervates

Answer 11

motor unit

Question 12

each muscle fiber receives innervation from blank

Answer 12

one motor neuron

Question 13

large motor neurons will innervate blank

Answer 13

many muscle fibers

Question 14

all muscle fibers in a single motor unit are blank

Answer 14

the same type

Question 15

largest motor units are blank fibers

Answer 15

FF

Question 16

smallest motor units are blank

Answer 16

S

Question 17

fine control has a blank average motor unit size

Answer 17

small

Question 18

force and speed control have blank motor unit size

Answer 18

large

Question 19

motor units are recruited in this order

Answer 19

smallest first

Question 20

receptor of muscle length

Answer 20

muscle spindle

Question 21

receptor of muscle force and contraction

Answer 21

golgi tendon organ

Question 22

muscle spindle has these specialized fibers called blank

Answer 22

intrafusal fibers

Question 23

intrafusal fibers have blank and blank centers

Answer 23

contractile, noncontractile

Question 24

2 types of information from muscle spindle

Answer 24

static length, dynamic length

Question 25

2 types of intrafusal fibers

Answer 25

nuclear bag (dynamic), nuclear chain (static)

Question 26

Intrafusal fibers are attached in blank with extrafusals

Answer 26

Parallel

Question 27

Cell bodies of all spindles are located here

Answer 27

Dorsal root ganglion

Question 28

These fibers innervate every single intrafusal fiber

Answer 28

Group 1a

Question 29

Contractile poles of the intrafusal fibers allows for the adjusting the blank of the spindle in conjunction with the extrafusals

Answer 29

Length

Question 30

These innervate the contractile poles of intrafusal fibers (bags and chains)

Answer 30

Gamma motor neurons

Question 31

Gamma motor neurons cell bodies are located here

Answer 31

Ventral horn (efferent)

Question 32

Alpha and gamma motor neurons are blank

Answer 32

Coactivated

Question 33

Gto are innervated by these

Answer 33

1b fibers

Question 34

Cell bodies of gto are located here

Answer 34

Dorsal root ganglion