PSYC 2410 Chapter : CNS Anatomy and Function.docx
1 Aug 2013
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Central nervous system: brain and spinal cord. Directions are described in relation to orientation of spinal cord. Difference between animals and human directions because we walk bipedally. Directions are rotated as we are standing up ** (rotate once clockwise once reach spine) Dorsal towards the surface of back or top of head. Proximal in pns closer to cns. Distal in pns farther from cns. Cervical region (neck): 7 vertebrae: cervical spinal cord, cervical nerve emerges. Thoracic region (chest): 12 vertebrae: thoracic spinal cord, thoracic nerve emerging. Lumbar region (back below chest area): 5 vertebrae: lumbar spinal cord, spinal cord ends in upper region of lumbar region, nerves still emerge below spinal cord ending (not solid spinal cord, horse tail nerves, lumbar nerves emerge. Sacral region (lower back): 5 vertebrae: sacral nerves emerge. Coccygeal region (tail): 3-5 vertebrae: coccygeal nerves emerge.
