Segments only begins in the midbrain begins in the

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Unformatted text preview: lls iinnervating muscles that nnervating muscles that move the head move the head iinvolved in reflex nvolved in reflex movements of head in movements of head in response tto visual and response o visual and auditory stimuli auditory stimuli Extrapyramidal Tracts Extrapyramidal Lateral & Medial Reticulospinal Lateral & Medial Reticulospinal Reticulospinal tract tract ttract originates iin tthe reticular ract originates n he reticular reticular formation of the brainstem fformation of the brainstem ormation iinvolved in the muscles that nvolved in the muscles that control posture and balance control posture and balance control also contain descending also contain descending analgesic pathways that analgesic pathways that rreduce ttransmission off pain educe ransmission of pain o signals to the brain signals to the brain signals tthe princiipal function of tthe unction he princ pal ffunction of he reticulospinall ttracts is to racts reticulo spina tracts is to reticulo provide efferent signals to tthe provide efferent signals to he efferent llaterall horn off the gray atera horn o the gray matter--the autonomic prematter the autonomic prematter--the autonomic ganglionic ffibers. This ganglionic fibers. This ibers. iinclludes both tthe sympathetic nc udes both the sympathetic he outflow as well as the sacral outflow as well as the sacral parasympathetics. parasympathetics parasympathetics. Extrapyramidal Tracts Extrapyramidal Vestibulospinal tract Vestibulospinal tract Cells are llocated in vestibular Cells are ocated in vestibular nuclei of the medulla,, and nuc lei of the medulla and nuc and tthey synapse onto lower hey synapse onto lower motor horn circuits of motor horn circuits of locomotorr and trunk llo comoto and trunk o and musculature tthat receives musculature that receives usculature hat receives iimpulses for balance from the mpulses for balance from the inner ear iinner ear nner based on saccular, based on saccular saccular, utricular and semiciircular utricular and semic rcular utricular and duct sensation--iinner ear nner duct sensation--inner ear duct and sense of and sense of balance/acceleration. balance/acceleration. controls limb muscles tthat controls limb muscles that hat maintain balance and posture maintain balance and posture maintain posture Spinal Sensory Pathways S...
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This note was uploaded on 12/08/2011 for the course AMY 2A taught by Professor Jamesivey during the Spring '06 term at Riverside Community College.

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