Textbook Notes (362,796)
Canada (158,054)
Psychology (9,545)
PSYA01H3 (1,192)
Steve Joordens (1,048)
Chapter 4

Chapter 4

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University of Toronto Scarborough
Steve Joordens

Chapter 4: the Biology of Behaviour NERVOUS SYSTEM Central NS Peripheral NS Brain Spinal Chord Brain Stem Cerebellum Cerebral Hemispheres - CENTRAL NERVOUS SYSTEM: only brain and spinal chord short distances, short communication system (synapses) - SPINAL CHORD: long, thin collection of nerve cells attached to base of brain and running along length of spinal column automatic reflexes - PERIPHERAL NERVOUS SYSTEM: cranial and spinal nerves; that part of the nervous system peripheral to brain and spinal chord long distance signals Thee Major Parts of Brain - Brain Stem: includes medulla, pons, and midbrain primarily control physiological functions and automatic behaviours - Cerebellum: pair of hemispheres resembling cerebral hemispheres but much smaller, lie beneath them, controls posture and movements, especially rapid ones - Cerebral Hemispheres: largest part of brain, covered by cerebral cortex and containing parts of brain that evolved most recently More Brain Terminology: - MENINGES: 3-layered set of membranes that enclose the brain and spinal chord (protection due to pressure of evolution?) meningitis is inflammation of meninges - CEREBRAL SPINAL FLUID (CSF): liquid in which brain and spinal chord float, provides shock-absorbing cushion brain does not come in direct contact with bones of skull and vertebrae fills space between meninges, acts as shock absorber - CEREBRAL CORTEX: outer layer of cerebral hemispheres of brain - GREY MATTER: abundant in cell bodies of neurons rather than axons - WHITE MATTER: abundant in axons rather than cell bodies of neurons, colour derived from presence of axons myelin sheaths - folds in brain increase surface area (fissures, gyrus, sulcus) www.notesolution.com
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