UMass Amherst KIN 460 - 08 - Sensory systems - skin sense- fall 2017 (23 pages)

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08 - Sensory systems - skin sense- fall 2017



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08 - Sensory systems - skin sense- fall 2017

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Pages:
23
School:
University of Massachusetts Amherst
Course:
Kin 460 - Motor Control
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Section 3 Sensory systems Kinesthetic Organs If you had to live without one sensory system vision proprioception vestibular which one would it be Why Somatosensory system Somatosensory system Most diverse sensory system Mediates a range of sensations touch pressure vibration limb position heat cold pain Functional subsystems Skin mechanoreceptors touch pressure vibration Muscle tendon joint receptors proprioception Pain receptors pain temperature overview How do cutaneous receptors work What different types of cutaneous receptors exist What is a receptive field How do somatic sensory afferent fibers reach the brain What happens in the brain in the somatic sensory cortex Somatosensory afferents convey information from skin surface to central circuits Dermatomes Dermatome maps of body regions innervated by each spinal nerve Transduction in a mechanosensory afferent a Pacinian corpuscle Stimulus deformation Ion channels open in the afferent nerve ending Receptor potential depolarization current Afferent action potential overview How do cutaneous receptors work What different types of cutaneous receptors exist What is a receptive field How do somatic sensory afferent fibers reach the brain What happens in the brain in the somatic sensory cortex Slowly and rapidly adapting mechanoreceptors respond differently to a stimulus size and shape tap on shoulder Mechanoreceptor types Pain temperature Low frequency vibration grip control slippage rapid Form texture high spatial resolution slow Skin stretch slow High frequency vibration rapid Simulated activity patterns in different mechanosensory afferents as Braille is read Form texture Low frequency Grip Control Skin stretch slow high frequency vibration rapid 270 mph overview How do cutaneous receptors work What different types of cutaneous receptors exist What is a receptive field How do somatic sensory afferent fibers reach the brain What happens in the brain in the somatic sensory cortex Receptive fields and two point discrimination threshold Receptive field area of the skin surface over which stimulation results in a significant change in the rate of action potentials of afferent fibers Loss of sensation Neuropathic Arthropathy Charcot joints in a patient with diabetic neuropathy Loss of sensation numbness blood flow to limbs unstable and deformed joints Occur with several diseases affecting the sensory nervous system diabetes syphilis alcoholism leprosy overview How do cutaneous receptors work What different types of cutaneous receptors exist What is a receptive field How do somatic sensory afferent fibers reach the brain What happens in the brain in the somatic sensory cortex Mechanosensory pathways Cuneate upper body Gracile lower limbs Decussation where fibers cross midline Mechanoreceptors Pain temperature Synapse above cord Synapse in cord What happens to lower limb sensation with spinal cord hemisection Spinal cord hemisection interruption of ascending fibers on one side crosses in cord pain temp crosses at brainstem mechanoreceptor Overview How do cutaneous receptors work What different types of cutaneous receptors exist What is a receptive field How do somatic sensory afferent fibers reach the brain What happens in the brain in the somatic sensory cortex S1 primary somatic sensory cortex What would it be like to lose proprioception but have a normal efferent system Ian Waterman Pride and a Daily Marathon Cole 1995 At age 19 got flu his immune system attacked nerves for touch and proprioception Initially did not move he says he could move but his lack of control made it dangerous and ineffective Taught himself how to walk to drive to hold an office job All his movements done under conscious control and continuous visual inspection Without thought there was no movement https www youtube com watch v pMEROPOK6v8


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