A newborn has an asymmetric Moro reflex. What does a nurse identify as a cause of this problem?
ExplanationD. Injury to the brachial plexus, clavicle, or humerus during birth prevents abduction and adduction movements of an upper extremity.
A. Children with Down syndrome exhibit the expected Moro reflex.
B. This is not considered a cause; however, if the cochlea were undeveloped or the eighth cranial (vestibulocochlear) nerve were injured, it would affect equilibrium and response to the test.
C. These injuries usually cause a symmetric loss of the Moro reflex.
