Kinesiology 1080A/B Lecture Notes - Lecture 15: Alpha Motor Neuron, Gamma Motor Neuron, Lesion

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

Document Summary

Lecture 15: corticobulbar and corticospinal tracts (feb. 12th 2018) Spinal cord connection with extrafusal muscle: ventral root ganglion is the pathway for signals from the spinal cord to muscles, muscle contracts and your body moves. Sends bilateral projections, one side will project its information to both sides, can control left and right upper facial musculature: caudal innervates lower facial muscles (mouth). Only projects its information to the contralateral side. Lower motor neuron disorder causing unilateral facial nerve paralysis: means that upper and lower facial muscles will be affected, mononeuropaathy involving lower motor neurons. Corticospinal tract: ventral corticospinal tract, largely originates from m1, des(cid:272)e(cid:374)ds (cid:862)u(cid:374)(cid:272)rossed(cid:863) i(cid:374) (cid:448)e(cid:374)tral (cid:272)olu(cid:373)(cid:374)s of the spi(cid:374)al (cid:272)ord, for(cid:373)i(cid:374)g (cid:272)orti(cid:272)ospi(cid:374)al tra(cid:272)t. Innervate axial musculature, the muscles involved in balance and upright stance: when these fibers terminate, they innervate propriospinal neurons, means that multiple motor neurons can be coordinated, important for balance control.