PS101 Chapter Notes - Chapter 4: Chemical Substance, Multiple Sclerosis, Phineas Gage
Document Summary
Chapter 4: the brain: source of mind and self. Portion of the nervous system consisting of the brain and the spinal cord. Spinal cord: collection of neurons and supportive tissue running from the base of the brain down the centre of the back, protected by a column of bones, spinal reflexes. Automatic, require no conscious effort (hot iron) Reflexes influenced by thoughts and emotions (e. g. erection) Neural circuits underly many spinal reflexes linked to neural pathways that run up and down spinal cord, to and from brain. Handles central nervous system input and output. Contains portions of the nervous system outside the brain and spinal cord. Sensory nerves: carry messages from receptors in skin, muscles, and other internal and external sense organs to the spinal cord, which sends them to the brain. Motor nerves: carry orders from central nervous system to muscle, gland, and internal organs, cause glands to secrete hormones.
