MEDS 371 Systems Neuroscience Central Somatosensory System Dr

MEDS 371, Systems Neuroscience Central Somatosensory System Dr. D. O. Kim

dorsal root gang. dorsal root ventral root Purves Fig 16 -10

Purves Fig A-4 spinal nerve

* somatotopic organization: topographic representation of the body in the nervous system * dermatomes: an area of skin that is mainly supplied by a single spinal nerve Also, think of cochleotopic (tonotopic) and retinotopic organizations.

Purves Box 9 A dermatomes

pain touch spinal cord Purves Fig 9 -1

The dorsal-column medial-lemniscus pathway medial lemniscus dorsal column nuclei dorsal col.

The dorsal-column medial-lemniscus pathway Purves

discriminative somatosensory pathway for face midbrain pons Purves Figure 9 -8

propriorceptive processing; spino-cerebellar cuneo-cerebellar pathways Lumbar & Thoracic spinal cord Purves Fig 9 -9

Propriorceptive inputs to cerebellum cortex Purves Fig 19 -3

Purves Fig 9 -11

homonculus Purves Fig 9 -11

where-stream: tactile localization what-stream: tactile object recognition “LOC” “TOR” Reed et al 2005

neural plasticity: ability of the nervous system to reorganize in response to learning or injury

A monkey was trained 1 hour daily where digits 2 and 3, and occasionally digit 4, were heavily used for several months. Purves, Fig. 9 -15, adapted from Jenkins et al. , 1990

Magnetoencephalographic measures in humans D 1: 1 -st digit D 5: 5 -th digit Elbert et al. , 1995