The biceps reflex is a deep tendon reflex that is elicited by tapping the biceps tendon, which then causes a contraction of the biceps muscle and flexion of the forearm.
Here's how to check for the biceps reflex, as described in the reference:
Steps to Elicit the Biceps Reflex
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Positioning: The patient's arm should be relaxed and slightly flexed at the elbow, with the palm facing up. The arm can be supported to ensure it remains relaxed.
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Locate the Biceps Tendon: Palpate the biceps tendon in the antecubital fossa (the bend of the elbow). You can usually feel it as a firm cord.
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Tap the Tendon: Use a reflex hammer to sharply tap the thumb or finger placed on the biceps tendon.
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Observe Response: The expected response is a visible contraction of the biceps muscle and flexion of the forearm. A slight movement is still considered a response. As mentioned in the reference, "...contraction of the bicep and flexion of the forearm...is how you check that deep tendon reflex."
Understanding the Reflex Response
| Expected Response | What You'll See |
|---|---|
| Biceps Contraction | The biceps muscle will tense up. |
| Forearm Flexion | The lower arm will move upwards at the elbow joint. |
- Normal Response: A slight movement or contraction is considered a normal reflex.
- Absent Response: If there is no response, it could indicate issues with the nervous system.
- Hyperactive Response: An exaggerated or brisk response could also suggest neurological issues.
Additional Notes:
- This reflex is part of a standard neurological examination.
- It assesses the function of the C5 and C6 nerve roots, which are part of the spinal cord.
- The information provided is for educational purposes only and should not be used to diagnose or treat any medical condition. Always consult a healthcare professional for medical advice.
