Spinal Reflexes – Myotactic (Stretch) Reflexes – Withdrawal Reflex
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Myotactic (Stretch) Reflexes

Withdrawal Reflex

Pelvic Limb
• Anatomy and Physiology
This reflex tests the L6-S1 segment of the spinal cord. The medial digit is innervated by the saphenous nerve which originates from L4-L6 thus this segment is also tested when the medial digit is stimulated.
• Assessment
Pinch the patient’s foot. The expected reflex is for the patient to flex the entire limb including the hip, stifle, and hock. It is important to use the least amount of stimulus as possible. If the animal displays a response with only touch do not crush the foot. If there is no response try using a hemostat, but do not apply so much pressure that the skin is injured.

 

Thoracic Limb
• Anatomy and Physiology
This reflex tests the C6-T1 segment of the spinal cord.
• Assessment
This reflex is tested in the same manner as the pelvic limb. Be sure to assess the dorsal, palmer, lateral and medial aspects of the foot.