Chaddock

Chaddock's sign is a neurological reflex that is used to identify damage to the upper motor neuron. It is named after the British neurologist, Charles Gilbert Chaddock, who first described it in 1911.

Description

Chaddock's sign is elicited by stroking the lateral malleolus or the skin under the external malleolus, towards the heel. If the reflex is present, it results in an upward movement of the big toe, similar to the Babinski sign. However, unlike the Babinski sign, Chaddock's sign does not require the sole of the foot to be stroked.

Clinical significance

Chaddock's sign is used in the clinical setting to identify damage to the upper motor neuron. It is one of several reflexes that can be used to assess the integrity of the pyramidal tract, a major pathway in the central nervous system that is responsible for carrying motor commands from the brain to the spinal cord.

See also

• Babinski sign
• Hoffmann's sign
• Oppenheim's sign
• Gordon's sign
• Schaeffer's sign
• Tromner's sign

References

Chaddock Resources
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