Chapter 55: Spinal Cord Motor Functions; the Cord Reflexes Flashcards

1
Q

Also located in the anterior horns of the spinal cord, in close association with the motor neurons, are a large number of small neurons that transmit inhibitory signals via glycine. These are called:

A

Renshaw cells

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2
Q

These ascending and descending propriospinal fibers of the cord provide pathways for the _____________ reflexes

A

multisegmental reflexes

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3
Q

These fibers form Multisegmental Connections From One Spinal Cord Level to Other Levels

A

Propriospinal fiber

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4
Q

The gamma efferent system is excited specifically by signals from the _________ region of the brain stem

A

bulboreticular facilitatory region

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5
Q

An especially important function of the stretch reflex is its ability to prevent oscillation or jerkiness of body movements, which is a ________ function

A

damping, or smoothing

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6
Q

Oscillation of muscle jerks

A

clonus

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7
Q

When tension on the muscle—and therefore on the tendon—becomes extreme, the inhibitory effect from the tendon organ can be so great that it leads to a sudden reaction in the spinal cord that causes instantaneous relaxation of the entire muscle. This effect is called:

A

lengthening reaction

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