PSY 250 Chapter Notes - Chapter 3: Stellate Cell, Frontal Lobe, Pyramidal Cell
26 Jan 2017
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Encased in bone and covered by three protective membranes (meninges: outer meninx (dura mater) arachnoid membrane, subarachnoid space (contains large blood vessels and cerebrospinal fluid) pia mater (adheres to surface of cns) Sns (somatic: interacts w/ external env, afferent nerves (carry sensory sig from skin, skeletal musc, joints, eyes, ears, to cns, efferent carry motor signals from cns to skeletal musc. Ans (autonomic: regulates internal env, afferent nerves carry signals from internal organs to cns, efferent carry motor signals from cns to internal organs. Sympathetic project from lumbar (small of back) and thoracic (chest) regions of sc. Project from cns on second stage neurons at a distance from target organs. Parasympathetic project from brain and sacral (lower back) Project from cns near target organ on short second stage neurons. Most project from spinal cord but 12 exceptions: 12 pairs of cranial nerves purely sensory nerves. Impedes passage of toxic substances from blood to brain.
