Somatosensory system: Peripheral Mechanisms

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Column 1 Column 2 (memorize)
The 16 types of afferents from the hand can be grouped into what functional groups? 1). Cutaneous mechanoreceptors, 2). proprioceptors, 3). lightly myelinated and unmyelinated afferents that respond to warming and cooling, and 4). lightly myelinated and unmyelinated afferents that repond to noxious and pruritic stimuli.
What is the I-IV and A-C classification for the primary spindle afferent axon type? Ia / A-alpha
What is the I-IV and A-C classification for the golgi tendon organ afferent axon type? Ib / A-alpha
What is the I-IV and A-C classification for the cutaneous mechanoreceptive afferent axon type? II / A-beta
What is the I-IV and A-C classification for the "cold" thermoreceptive / pricking pain afferent axon type? III / A-delta
What is the I-IV and A-C classification for the "warm" thermoreceptive / burning pain afferent axon type? IV / C
What fibers from the A-C classification are myelinated? All of the A fibers (I-III).
What fibers from the A-C classification are unmyelinated? The C fiber (IV).
What is the diameter of A-alpha (Ia/Ib) fibers? 12-20 microns
What is the diameter of A-beta (II) fibers? 7-12 microns
What is the diameter of A-delta (III) fibers? 2-6 microns
What is the diameter of C fibers? .3-1.5 microns
What is the conduction velocity of A-alpha (Ia/Ib) fibers? 72-120 m/s
What is the conduction velocity of C (IV) fibers? .5-1.2 m/s
What are Ia/Aα fibers sensitive to? Innervate primary spindle afferents. Muscle length and velocity of contraction.
What are II/Aβ fibers sensitive to? Those innervating secondary spindle afferents are sensitive to muscle length. Those innervating joint receptors are sensitive to joint extremes.
What are Aδ fibers sensitive to? Cold temperatures and pricking pain. Lightly myelinated. Seems to be temporal code (bursting used for cold temperatures).
What are C fibers sensitive to? Warm temperatures and burning pain. Unmyelinated.
Merkel cells detect what? Connected to what afferents? Static and dynamic skin deformation. SAI afferents.
Meissner corpuscles detect what? Connected to what afferents? Dynamic skin deformation. RAI afferents.
Ruffini corpuscles detect what? Connected to what afferents? Static and dynamic skin deformation and particularly skin stretch. SAII afferents.
Pacinian corpuscles detect what? Connected to what afferents? High frequency vibrations. RAII afferents.
"Cold afferents" are? Aδ/III fibers.
"Warm afferents" are? C/IV fibers.

[edit] See also

[edit] NeuroCog Lectures

[edit lecture list]

NeuroCog Lectures
Date Time Topic Instructor
Mon 4-Jan 10:45-11:45 Intro to thalamus and cortex Hendry
Wed 6-Jan 10:45-11:45 Neural Mechanisms of pain Caterina
Fri 8-Jan 10:45-11:45 Molecular mechanisms of pain Caterina
Fri 8-Jan 1:00-3:00 Somatosensory lab 1 Schramm, Blue, Wilson/NT/TM
Mon 11-Jan 10:45-11:45 Trigeminal system Dong
Wed 13-Jan 10:45-11:45 Somatosensory system: Peripheral Mechanisms Hsiao
Fri 15-Jan 10:45-11:45 Somatosensory system: Central mechanisms Hsiao
Fri 15-Jan 1:00-3:00 Somatosensory lab 2 Schramm, Blue, Wilson/NT/TM
Mon 18-Jan Martin Luther King Jr Day-no classes
Wed 20-Jan 10:45-11:45 Retina and phototransduction Yau
Fri 22-Jan 10:45-11:45 Olfaction and taste Yau
Fri 22-Jan 1:00-3:00 Methods: bioinformatics Pevsner
Mon 25-Jan 10:45-11:45 Early visual processing I Hendry
Wed 27-Jan 10:45-11:45 Early visual processing II Hendry
Fri 29-Jan 10:45-11:45 Shape perception - Connor Connor
Fri 29-Jan 1:00-3:00 Visual systems lab Schramm, Blue, Wilson/VM/EG
Mon 1-Feb 10:45-11:45 Motion perception Connor
Wed 3-Feb 1:00-2:00 Spatial perception Connor
5-Feb Graduate Program Interviews-no classes
Mon 8-Feb 10:45-11:45 Attention lecture Yantis
Wed 10-Feb 10:45-11:45 Receptive fields and image segmentation von der Heydt
Fri 12-Feb 10:45-11:45 Cross-modal integration Hsiao
Fri 12-Feb 1:00-3:00 Methods: mathematical tools and concepts Niebur
Mon 15-Feb 10:45-11:45 The binding problem Niebur
Wed 17-Feb 10:45-11:45 Spinal cord circuitry lecture Bastian
Fri 19-Feb 12:00-1:00 Motor cortex lecture Bastian
Fri 19-Feb 1:00-3:00 Motor neuron lab Schramm, Blue, Wilson/NT/EG
Mon 22-Feb 10:45-11:45 Cerebellum lecture Bastian
Wed 24-Feb 10:45-11:45 ALS Rothstein
Fri 26-Feb 10:45-11:45 Basal ganglia lecture Stuphorn
Fri 26-Feb 1:00-3:00 Cerebellum lab Schramm, Blue,Wilson/VM/NT
Wed 3-Mar 10:45-11:45 Parkinson's disease lecture Dawson T
Fri 5-Mar 10:45-11:45 Huntington's Disease Ross
Fri 5-Mar 1:00-3:00 Basal ganglia lab Schramm, Blue, Wilson/NT/TM
|March 8-12 Spring Break-no classes
Mon 15-Mar 10:45-11:45 Oculomotor system lecture Zee
Wed 17-Mar 10:45-11:45 Vestibular lecture Minor
17-Mar 2-Jan review ALL TAs
Fri 19-Mar 10:30-11:45 METHODS: Movement Research **in Bastian lab, note time change Bastian
Fri 19-Mar 1:00-3:00 Vestibular lab Schramm, Blue, Wilson/EG/VM
Mon 22-Mar 9:00 AM MIDTERM EXAM
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