Kinesiology 1080A/B Lecture Notes - Lecture 4: Muscle Spindle, Gamma Motor Neuron, Extrafusal Muscle Fiber

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 1080A/B
• Professor: Matthew Heath

Document Summary

Coricobulbar tract innervates facial musculature (facial expressions) and masicaion (swallowing food) Facial nucleus is divided into rostral (innervates forehead) and caudal (innervates mouth) parts. What is the impact of an upper vs. lower motor neuron lesion: tumour in the right cerebral cortex (upper and lower) upper from corical motor neuron to its synapse. Will only experience impairment in the lower let muscles of his face, because the rostral part of the brain is innervated bilaterally: damage to the right pons lower enire right side of the face will experience paralysis. Rostral component can innervate muscles on either the let or right side of the face. Caudal component only project contralaterally (opposite side of body) Originate from m1 (primary motor cortex) (most ibers) Descend uncrossed in ventral columns of the spinal cord, forming ventral coricospinal tract. Innervate axial musculature (muscles of the back or trunk, that allow us to bend or lex at hips) only innervates axial muscles.