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

Perineal Reflex

• Anatomy and Physiology
The sensory component of this reflex is from the pudendal nerve originating in the S1-S2(3) spinal segment. Anal sphincter contraction is mediated through the motor nerve of the pudendal. Tail flexion is mediated through the caudal nerve.
• Assessment
The perineum is lightly stimulated. The stimulus should not be painful. The expected response is a contraction of the anal sphincter and flexion of the tail.