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Neuro > Motor 2 > Flashcards

Motor 2 Flashcards

1
Q

alpha motor neurons

A

ventral root

make skeletal muscles contract

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2
Q

gamma motor neurons

A

ventral root

make muscle spindles more sensitive to stretch

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3
Q

α Motoneurons

A

innervate extrafusal skeletal muscle fibers

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4
Q

γ Motoneurons

A

innervate specialized intrafusal muscle fibers

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5
Q

Muscle Spindle

A

monitor changes in the length of skeletal muscle

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6
Q

Nuclear bag fibers

A

larger, and their nuclei are accumulated in a central (“bag”) region

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7
Q

Nuclear chain fibers

A

smaller, and their nuclei are arranged in rows (“chains”)

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8
Q

group 1a afferent nerve

A

innervates nuclear bag fibers and the nuclear chain fibers

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9
Q

group 2 afferent nerves

A

innervates nuclear chain fibers

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10
Q

Dynamic γ motoneurons

A

synapse on nuclear bag fibers in “plate endings”

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11
Q

Static γ motoneurons

A

synapse on nuclear chain fibers in “trail endings”

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12
Q

α-γ motor coactivation

A

γ-motor discharge ↑es along with ↑ed discharge of α-MN

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13
Q

Group Ib fibers

A

primary afferents

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14
Q

Golgi Tendon Organ Reflex

A

group Ib afferent fibers

inhibitory neurons

changes in FORCE

inhibit the α motoneurons

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15
Q

muscle spindle reflex

A

contraction

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16
Q

Golgi tendon reflex

A

muscle relaxation and load drop

17
Q

spinal reflex

A

Stretch reflex

18
Q

cranial reflex

A

pupillary light reflex

19
Q

monosynaptic reflex

A

single synapse between the afferent and efferent neurons

20
Q

polysynaptic reflex

A

two or more synapses

through an interneuron

21
Q

tonic stretch reflex

A

maintains posture

22
Q

S1-2 reflex

A

ankle jerk

1, 2 buckle my shoe

23
Q

L3-4 reflex

A

ankle jerk

3, 4 kick the door

24
Q

C5-6 reflex

A

biceps and supinator jerks

5, 6 pick up sticks

25
Q

C7 reflex

A

triceps jerk

7, 8 shut the gate

26
Q

C8 reflex

A

finger jerk

7, 8 shut the gate

27
Q

Babinski sign

A

Normal in children under 18 months of age

after age 18 months, indicates an interruption of the corticospinal tract.

positive =
big toe extends
corticospinal tract interruption

Neuro (16 decks)

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