Summary organisation of the nervous system

Lecture 1 : organization of the nervous system

Cells of the NS : neurons & glia -> neural circuits (+endoth cells, pericytes)
Neural circuits : primary components of the neural sys, process specific types of info
neural syst :
1) sensory syst
2) motor syst
3) association syst : sens + motor

Genetics and the brain : Human -> 20’000 genes, 14’000 expressed in the developing brain, 8’000 in all cells and
tissue

Subdivision of the NS :
Subdivision Components Special features Location

Central 1) Brain (+ CN2 + retina) - Oligo → myelin - Covered by meninges (o->i : dura
2) spinal cord - Axons CANNOT mater, arachnoid, pia mater)
3) Optic n (CN2) regenerate - Gray matter : cell bodies +
unmyelinated fibers
- nuclei : clusters of cell bodies within
the white matter of the CNS

Peripheral 1) Peri ganglia* (+ cell bodies) - Schwann cell -> - outside the dura mater
2) sensory respector myelin - * = Gps of n. cells concentrated into
3) peri portion of spinal cord + - Axons can small knots or clumps located
CN (no CN2) regenerate outside the CNS
Afferent + efferent

Autonomic Selected portions of the CNS and PNS Functionally distinct system




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