Finger jerk refers to a specific type of reflex response observed in the fingers.
Understanding Finger Jerk
Based on medical definition, finger jerk is defined precisely as the reflex flexion of fingers on tapping the biceps tendon or eliciting the brachioradial reflex.
This means that when certain tendons in the arm are stimulated in a particular way, the fingers involuntary and quickly bend inwards (flex). It's a nervous system response that doesn't require conscious thought.
How Finger Jerk is Elicited
As the definition states, this reflex can be brought about through two primary methods:
- Tapping the Biceps Tendon: This tendon is located at the elbow and connects the biceps muscle to the forearm bone. A tap here can trigger the reflex.
- Eliciting the Brachioradial Reflex: The brachioradial reflex is another common reflex tested by tapping the tendon of the brachioradialis muscle, usually located on the thumb side of the forearm near the elbow.
What Happens During Finger Jerk
The observable action during a finger jerk is the reflex flexion of fingers. This means the fingers will quickly curl or bend. It is an automatic motor response triggered by the sensory input from the stimulated tendon, mediated through the spinal cord.
In summary, finger jerk is a specific reflex where the fingers flex involuntarily when the biceps tendon or brachioradial reflex is tested.
