Midbrain/Cortical Reflexes

Question 1

Neck Righting Action on Body

Answer 1

Supine: passive rotation of head - body rotates as whole to align body with head.
4-6mo - 5 yrs.

Question 2

Body Righting Acting on Body

Answer 2

Supine: passive rotate upper or lower trunk - body segment not rotated will align with rotated segment.
4-6mo - 5yrs.

Question 3

Labyrinthine Head Righting

Answer 3

Occlude vision - tip body. Head will orient to vertical with mouth horizontal.
Birth-2mo - persists.

Question 4

Optical Righting

Answer 4

Tip body - head will orient to vertical with mouth horizontal.
Birth-2mo - persists.

Question 5

Body Righting Acting on Head

Answer 5

prone or supine - head orients to vertical with mouth horizontal.
Birth-2mo - 5yrs.

Question 6

Protective Extension

Answer 6

Displace COG outside BOS - arms/legs extend and abduct to support/protect body form falling.
Arms: 4-6 mo.
Legs: 6-9 mo.
Persists.

Question 7

Equilibrium Reactions - Tilting

Answer 7

Tilt support surface - curvature of trunk toward upward side, extension and abduction of extremities on that side, and protective extension of opposite side.
Prone: 6mo, Supine: 7-8mo, Sitting: 7-8mo, Quad: 9-12mo, Stand: 12-21mo.

Question 8

Equilibrium Reactions - Postural Fixation

Answer 8

Push COG out of BOS - curvature of trunk towards external force, with extension and abduction of extremities on force side.
Prone: 6mo, Supine: 7-8mo, Sit: 7-8mo, Quad: 9-12mo, StandL 12-21mo.