Primitive reflexes are those reflexes present in the child or adult that are no longer a normal response to stimuli after a certain age.A primitive reflex elicited by an extension of the head,which causes increased extensor tone in the upper extremities and increased flexor tone in the lower extremities is called:

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The symmetrical tonic neck reflex (STNR) is elicited by extending the head, which leads to increased extensor tone in the upper extremities and increased flexor tone in the lower extremities. This reflex is considered primitive and typically integrates as the child develops.

Primitive Reflexes Are Those Reflexes Present in the Child or Adult