BPK 207 Study Guide - Final Guide: Premotor Cortex, Muscle Spindle, Proprioception

• School: Simon Fraser University
• Department: Biomedical Physio & Kines
• Course: BPK 207
• Professor: Dan Marigold

Document Summary

Cat"s brain is disconnected from spinal cord and she is immobilized. Experiment physically brings cat"s hind limb into extension, this causes the flexor motor neurons to fire as though it is actually moving. The muscle spindle sends stretch signals thru ia afferents to cpg which in turn triggers flexor activity. Main idea: hip extension triggers swing phase b/c pulling the leg into extension signals that extension is occurring which triggers flexion. Hip proprioception is being used by cpgs to regulate the swing phase. Cat is walking on treadmill with clamp attached, which stimulates and pulls the extensor muscle signalling that extensor activity has stopped, which causes flexion activity. If extensors turn of earlier, flexion occurs earlier. As cat is walking, ib afferents are stimulated which mimics as though gtos are sensing a load in the limb so in response to this extensor muscle activity is enhanced to prevent from collapsing.