Primitive Reflexes

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Last updated 11:42 PM on 6/1/26
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16 Terms

1
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Rooting

  • stroke cheek —> infant turns head toward stimulus and opens mouth

  • appears at birth

  • integrates at 3-4 months

2
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sucking

  • touch lips/roof of mouth —> sucking motion

  • appears at birth

  • integrates ~ 2-5 months (becomes boluntary)

3
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moro

  • sudden head drop or loss of support —> arms abduct/extend, then adduct/flex, often crying

  • appears at birth

  • integrates 4-6 months

4
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startle

  • sudden loud noise —> generalized flexion/extension response

  • appears at birth

  • persists through life

5
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palmer grasp

  • pressure in palm —> finger flexion/grasp

  • appears at birth

  • integrates 4-6 months

6
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plantar grasp

  • pressure under toes —> toe flexion

  • appears at birth

  • integrates 9-12 months

7
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babinski

  • stroke lateral sole —> great toe extension and toe fanning

  • appears at birth

  • integrates 12-24 moths

8
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Asymmetrical Tonic Neck Reflex (ATNR)

  • turn head to one side —> face-side extremities extend, skull-side flex (fencer position)

  • appears at birth

  • integrates 4-6 months

9
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symmetrical tonic neck reflex (STNR)

  • neck flexion —> arms flex, legs extend ; neck extension —> arms extend, legs flex

  • appears 4-6 months

  • integrates 8-12 months

10
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tonic labyrinthine reflex (TLR)

  • supine —> extensor tone dominates ; prone —> flexor tone dominates

  • appears at birth

  • integrates ~6 months

11
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positive support

  • weight bearing on feet —> legs extend to support weight

  • appears at birth

  • integrates 2-4 months

12
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stopping (automatic walking)

  • hold upright with feet touching surface —> alternating stepping

  • appears at birth

  • integrates 1-2 months

13
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galant (trunk incurvation)

  • stroke one side of spine —> trunk curves toward stimulus

  • appears at brith

  • integrates 2-4 months

14
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crossed extension

  • flex one leg and apply stimulus to sole —> opposite leg extends

  • appears at brith

  • integrates 1-2 months

15
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flexor withdrawal

  • noxious stimulus to sole —> leg flexes away

  • appears at brith

  • integrates ~2 months

16
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placing

  • dorsum of foot contacts edge —> hip/knee flex and foot placed on surface

  • appears at birth

  • integrates ~2 months