Cord reflex (Reflex Arch)

• Cord reflex (Reflex Arch)

• Segmental- Sensory linkage to motoneuron pools
• Interneurons link muscle groups that control extension or flexion via excitatory neurons while relaxing anatagonists by interneuronal inhibition of the ventral horn motoneurons.

• Intersegmental reflex movements- Interneurons link sensory input, axially, to motoneuron pools; These intersegmental axons target descending pathways.

• Swimming; snake-like
• Quadraped stepping- Based on segmental reflexes that are initialized by brain stem.