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Canada (162,200)
Psychology (9,697)
PSYB65H3 (479)
Ted Petit (185)
Chapter 5

Chapter 5 - The Sensorimotor System

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Department
Psychology
Course
PSYB65H3
Professor
Ted Petit
Semester
Fall

Description
Sensory and motor systems and disorders5 6 Chapter 5The Sensorimotor System Accurate movements depend on our ability to monitor the position and placements of our body and its partsfrom out joints tendons muscles and skin which relies on somatosensory feedback Module 51 Sensorimotor SystemWhy SensorimotorRole of somatosensory feedback in production of movements Is illustrated by former darts champion called GO who experienced almost complete destruction of somatosensory nerves in both arms due to an infectioncould still do finemotor skills with fingers and was able to make shapes in the air w fingers but GO stated that his hands were virtually useless to himunable to perform intricate motor skills pick up cereal fasten buttonsSomatosensory ReceptorsSomatosensory information that we receive about the world comes from sensory receptors in skin ie vibration pain pressure and touchThe types of receptors are usually functionally grouped into 3 types 1 Nociception Sensations of pain and temperature 2 Hapsis Sensation of fine touch and pressure 3 Proprioception Awareness of the body and its position in space react to distortion such as end or stretchingMost skin receptors in skin are mechanoreceptors Many different types of mechanoreceptors throughout the body although most are axons that have mechanosensitive ion channels axons that contain these ion channels are primary afferent axons that enter SC through dorsal rootsSC is organized into dorsal and ventral root ganglia 1 Dorsal root gangliasomatosensory 2Ventral root gangliamotor30 pairs of spinal nerves each made up of dorsal and ventral roots that exist in SC 4 groups on basis where nerves originate C 18cervical T 18 thoracic L 112lumbar S 15sacral Each of 30 dorsal roots of SC innervates different areas of skin called dermatonesSomatosensory Pathways in the BrainThere areof sensory pathways in the brain and are often divided into 2 main pathways which are named for their position in the SC and the connections made 1 Dorsal spinothalamic tractResponsible for transmitting information about proprioception and hapsis enter SC through dorsal root ganglionsynapses ipsilaterally in the dorsal column nuclei of SCy Axons ascend through SC until brainstem and continues through brainstem pathway called medial lemniscus y Axons in lemniscus synapse sends projections to both motor and somatosensory cortexwhich enters the SC through 2 Nociceptive information travels separately in ventral spinothalamic tractdorsal root ganglion and ascends the SC contralaterally
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