Learn about the symmetric tonic neck reflex, what causes it, what to expect, and more. Skip to main ... but can be useful in detecting retained primitive reflexes such as STNR. Sources Update History.

Learn about your baby’s symmetric tonic neck reflex (STNR), including its relationship with other primitive reflexes, including TLR and ATNR.

Learn all about asymmetric tonic neck reflex in children, what it is, its causes, and symptoms. Find out how it affects your baby and what the treatment options are.