BSC 228 Lecture Notes - Lecture 5: Efferent Nerve Fiber, Peripheral Nervous System, Somatic Nervous System
Document Summary
Chapter 5 central nervous system: a "wired" system. Specific pathways for transmission of signals between areas of body - in general, coordinates rapid, precise responses. Interacts with endocrine system ("wireless": organization of nervous system - central nervous system (cns, brain and spinal cord. Meninges: connective tissue membranes 1. dura mater - outer layer: forms dural sinuses and venous sinuses (blood and csf pool, return to circulation) 2. arachnoid mater. Middle layer: subarachnoid space contains csf, arachnoid villi reabsorb csf (return to blood in sinuses) 3. pia mater - inner layer, well vascularized, important in forming csf. Bones offer physical protection: cranium (skull) - brain, vertebral column - spinal cord, brain structure, cerebrum. Cortex is outer layer of gray matter (neuron cell bodies and dendrites, glial cells) Underneath is white matter (tracts of myelinated fibers), which transmits signals between cortical areas, and to other cns locations.
