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Lecture 8

KP161 Lecture Notes - Lecture 8: Cerebral Cortex, Cornea, Proprioception


Department
Kinesiology & Physical Education
Course Code
KP161
Professor
Michael Cinelli
Lecture
8

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Neural Mechanisms: Contributions and Control
January 25, 2017
10:31 AM
Pinal Reflexes
An automatic, involuntary response to stimuli
Reflex arc:
Simplest pathway to which a reflex occurs
Types:
Monosynaptic (only one- approx. 30 sec)
Knee tap from doctor
Polysynaptic (more than one synapse- more time)
Withdrawl of leg to take a step
Both ventral horns involved
Damage to the spinal cord
Types of injury:
Complete
Incomplete: efforts of the injury depend on of the area of the spinal cord affected
The level of injury:
In general, the higher up the spinal cord the injury, the less motor control you have (lower back
vs. neck)
Lumbar= legs
Neck= upper and lower extremities
Sensory/Perceptual Systems
Stimulate reflexive movement at the spinal cord level
Modulate output of movement
Adjust frequency/ force of movement
Modulate movement resulting from commands originating in higher centers of the nervous
system
Control movement via the ascending pathways
Soma = body therefore somatosensory is info from the body about body position
Sensory receptors
Detect stimuli and provide info
Exteroceptors- gather info from external enviro (sounds and sight)
Interoceptors- internal to body ex. Joints
Proprioceptors- position of limbs
Relay info to the CNS, where it is interpreted
Vision
Predominant sensory receptor:
70% of all sensory receptors are located in the eye
40% o the cerebral cortex is thought to be processing vision info at any given point
Sports vision:
Focuses on investigating visual contributions to performance
Visual System
Exteroceptive sense
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