The asymmetric tonic neck reflex. Its presence and significance in the newborn.

Asymmetric tonic neck reflex (ATNR) is an easily elicited reflex in the immediate newborn period and should not be considered pathologic unless it is obligatory. Although bidirectional responses are normally encountered, unidirectional responses are not uncommon. The majority of infants display the complete reflex, however, the lower extremities are the most consistent participants.