Deep tendon reflex

Deep Tendon Reflex

The Deep Tendon Reflex (DTR), also known as the Stretch Reflex, is a type of reflex that is elicited by a brisk tap on the tendons of the skeletal muscles. Pronunciation: /di:p 'tɛndən 'ri:flɛks/.

Etymology

The term "Deep Tendon Reflex" originates from the fact that the reflex is elicited by stimulating the deep tendons of the skeletal muscles. The term "reflex" comes from the Latin word "reflexus", meaning "bent back", while "tendon" comes from the Latin word "tendere", meaning "to stretch".

Function

The primary function of the Deep Tendon Reflex is to protect the muscles from overstretching. When a muscle is stretched, the muscle spindles within the muscle send a signal to the spinal cord, which then sends a signal back to the muscle causing it to contract. This reflexive contraction prevents the muscle from being stretched too far.

Testing

Deep Tendon Reflexes are commonly tested during a neurological examination. The most commonly tested reflexes are the biceps reflex, the triceps reflex, the brachioradialis reflex, the patellar reflex, and the Achilles reflex. The reflexes are graded on a scale from 0 to 4, with 0 indicating no response and 4 indicating a hyperactive response.

Related Terms

• Hyperreflexia: An exaggerated reflex response, often indicative of certain neurological conditions.
• Hyporeflexia: A diminished reflex response, often indicative of certain neurological conditions.
• Monosynaptic reflex: A type of reflex that involves only one synapse between the sensory and motor neuron, such as the Deep Tendon Reflex.

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