Final answer:
The Achilles tendon reflex is a deep tendon reflex that assesses the function of the lower motor neurons in the spinal cord. It is elicited by striking the Achilles tendon and causes a reflexive contraction of the calf muscles.
Step-by-step explanation:
Achilles tendon reflex is a deep tendon reflex that is tested as part of the neurological exam. It is commonly used to assess the function of the lower motor neurons (LMNs) in the spinal cord. The reflex is elicited by striking the Achilles tendon with a rubber mallet, which stretches the calf muscles and activates the muscle spindles. This results in a signal being sent into the spinal cord, causing a reflexive contraction of the calf muscles.