Somatosensory Sensation & Motor Functions

Somatosensory Sensation & Motor Functions Interdisciplinary Program in Neuroscience Eye Movement & Vision Research LAB Hwang, Jae Won

Somatosensory Sensation • Somatosensory Sensation • Modalities • Receptors • Somatosensory Pathways • Somatosensory Cortex • Motor Functions • Disorders

Somatosensory Modalities • Touch • Proprioception • Nociception • Temperature Sense

Ref. 1. Ch 22 p. 431 Morphology of DRG Cell

Ref. 1. Ch 22 p. 433 Mechanoreceptors (touch)

Ref. 1. Ch 21 p. 415 Mechanoreceptors (proprioception)

Ref. 1. Ch 22 p. 432 Receptor Types

Ref. 1. Ch 22 p. 434 Receptive Field (touch)

Ref. 1. Ch 22 p. 436 Two Point Discrimination

Ref. 1. Ch 22 p. 445 Distribution of Dermatomes

Ref. 1. Ch 18 p. 339 & Ref. 2. Ch 3 p.76 Spinal Cord

Ref. 3. http://thalamus.wustl.edu/course/bassens.html Touch & Proprioception(joint) Pathway

Ref. 2. Ch 5 p. 195 Decussation of Medial Lemnisci

Ref. 3. http://thalamus.wustl.edu/course/body.html Proprioception(muscle & tendon) Pathway

Ref. 1. Ch 24 p. 473-474 Nociceptive Afferent Fibers

Ref. 3. http://thalamus.wustl.edu/course/body.html Pain & Temperature Pathway

Ref. 1. Ch 22 p. 447 Sensory Pathways (summary)

Comparison of sensory pathway description among the references

Ref. 2. Ch 4 p. 145 Ascending & Descending Tracts

Ref. 2. Ch 4 p. 168 Segmental Organization of SC

Ref. 1. Ch 18 p. 343 Thalamus

Ref. 1. Ch 23 p. 453 Somatosensory Cortex

Ref. 1. Ch 23 p. 456 RF of Cell in a Column in SSC

Ref. 1. Ch 23 p. 455 Receptive Fields of Neurons in SSC

Ref. 1. Ch 23 p. 459 Columnar Organization of Sensory Input

Ref. 1. Ch 18 p. 344 Sensory Homunculus

Ref. 1. Ch 18 p. 345 Processing of Sensory Information

Motor Functions • Somatosensory Sensation • Motor Functions • Brain Structures Involved in Motor Control • Motor Pathways • Motor Neurons • Neuromuscular Junction • Disorders

Ref. 4. Ch 4 p. 144 & Ref. 1. Ch 38 p. 760 Motor Cortices

Ref. 1. Ch 19 p. 356 Flow of Motor Information

Ref. 1. Ch 38 p. 773 Supplementary & Premotor Areas

Ref. 4. Ch 4 p.148 & Ref. 1. Ch 28 p. 567 Parietal Cortex

Ref. 5. Ch 8 p. 216 Command Flow of Left PL

Ref. 1. Ch 42 p. 835 Cerebellum

Ref. 1. Ch 43 p. 856 Basal Ganglia

Ref. 3. http://thalamus.wustl.edu/course/basmot.html Corticospinal Tract anterior corticospinal tract (about 10%) lateral corticospinal tract

Ref. 2. Ch 5 p. 195 Pyramidal Decussation

Ref. 1. Ch 18 p. 346 Corticospinal Tract

Ref. 5. Ch 8 p. 212 Corticobulbar & Rubrospinal Tracts

Ref. 5. Ch 8 p. 213 Ventromedial Pathways

Ref. 2. Ch 4 p. 165 Motor Neurons

Ref. 1. Ch 11 p. 188 Neuromuscular Junction

Disorders • Somatosensory Sensation • Motor Functions • Disorders • Spinal Cord Syndromes • Phantom Limb • Agnosia & Apraxia • Subcortical Motor Disorders • Neurogenic Diseases of Motor Unit

Ref. 2. Ch 4 p. 173 Spinal Cord Syndromes

Ref. 1. Ch 20 p. 393 Phantom Limb

Ref. 6. Ch 2 p. 32 & Ref. 7. p. 1610 MEG of Amputee

Agnosia • The Inability to perceive or identify a stimulus by means of a particular sensory modality, even though its details can be detected by means of that modality and the person retains relatively normal intellectual capacity • Apperceptive visual agnosia • People with apperceptive visual agnosia may have normal visual acuity, but they cannot successfully recognize objects visually by their shape. • Prosopagnosia (Prosopon means “face”) • Associative visual agnosia • People with associative visual agnosia appear to be able to perceive normally but cannot name what they have seen.

Ref. 1. Ch 62 p. 1235 Example of Agnosia

Somatosensory Sensation & Motor Functions