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Canada (162,366)
Psychology (9,699)
PSYB65H3 (479)
Ted Petit (185)
Chapter 5

PSYB65 Chapter 5 Detailed chapter notes

10 Pages
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Department
Psychology
Course Code
PSYB65H3
Professor
Ted Petit

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Chapter 5 The Sensorimotor SystemModule 51 Sensorimotor SystemUsed to movingutilizes a parallel and hierarchical system that relies heavily on functional segregation Somatosensory ReceptorsTypes of receptors are usually functionally grouped into three types of somatic information 1Nociceptionsensations of pain and temperature2Hapsissensations of fine touch and pressure3Proprioceptionawareness of the body and its position in baseMost of the sensory receptors in the skin are mechanoreceptors Receptors that react to distortion such as bending or stretching There are many different types of mechanoreceptors throughout the bodymost are axons that have mechanosensitive ion channels on themPrimary afferent axons that enter the spinal cord through the dorsal roots Cell bodies of primary afferent axons reside in the dorsal root ganglia of spinal cord Spinal cord is organized into dorsal and ventral root ganglia Dorsal root ganglia somatosensoryVentral root ganglia motor30 pairs of spinal nerveseach makes up a dorsal and ventral roots that exit the spinal cord through a notch in the vertebrae of the spineSpinal segments divided into 4 groups on the basis of where the nerves originateCervical C18Thoracic T112Lumbar L15Sacral S15Each of the 30 dorsal roots of the spinal cord innervates different areas of the skin dermatomesWhen a dorsal root is cut the spinal cord can no longer obtain information from that nerve however not all sensation from that dermatome is lostextensive overlap between dermatomesTo lose complete sensation in one dermatome must cut 3 dorsal roots the one serving the dermatome and the dorsal roots above and below itSomatosensory Pathways in the BrainTwo main somatosensory pathways that are named for their position in the spinal cord and the connections made Dorsal spinothalamic tract Ventral spinothalamic tract1 Dorsal Spinothalamic tractResponsible for transmitting information about proprioception and hapsisEnters the spinal cord through the dorsal root ganglion and synapses ipsilaterally into the dorsal column nuclei of the spinal cord 1
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