HTHSCI 1H06 Lecture 28: CNS 2.
29 Apr 2016
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Document Summary
Relays sensory information to brain and relays motor information to pns. Spinal cord is shorter than vertebral canal. Nerve roots extend further via cauda equina. Dermatome - a region of skin innervated by a spinal segment. Fissures: a long narrow opening in the form of a crack or groove (e. g. spaces separating convolutions in the brain) Sulci: a groove or furrow on the surface of the brain. Gyri: a ridge or fold between two clefts on the cerebral surface in the brain. 3. super cial grey matter (neurons) white matter tracts (axons) deep nuclei (neurons) formed around ventricles grey matter = neurons. Cortical grey matter is organized into columns white matter = axons. There are more sensory and motor cortical neurons dedicated to the upper and lower limbs than the trunk = homunculus commissures. To different parts of cns projection bres. Organization of cortex super cial and deep grey matter.
