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Introduction to Brain and Behavior [NOTES] Part 4 -- I got a 92% in the course

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Department
Psychology
Course
PSB 2000
Professor
All Professors
Semester
Winter

Description
♦ Spinal cord conveys messages to and from brain  → White matter consists of axons, so this is where info is conveyed up to or down from the  brain → A spinal nerve contains both sensory fibers (afferents) and motor fibers (efferents) → 31 pairs of spinal nerves • Cervical, Thoracic, Lumbar, Sacral, Coccygeal • Each spinal nerve has a sensory and motor component  • Segment of skin/muscle/bone associated with a spinal nerve → Near the spinal cord, the sensory fibers entering are called the dorsal root, the motor  fibers exiting are called the ventral root → Bell­Magendie Law: the entering dorsal roots carry sensory information to the brain and  the exiting ventral roots carry motor information to the muscles and glands; when you  touch something hot and pull your hand away = reflexive response  ♦ The spinal cord organizes reflexes → Involuntary, stereotyped response to a sensory input → Modifiable → Stretch reflex: muscle contraction in response to stretch; monosynaptic; reciprocal  inhibition → Flexor (withdrawal) reflex ♦ Peripheral Nervous system → Somatic nervous system: • Controls voluntary muscles and conveys sensory information to the central nervous  system; you are aware of it, you can control it • Nerves outside brain and spinal cord • Nerves that convey info from sense organs to CNS and from CNS to muscles  • It takes 1 neuron to get from the spinal cord to a muscle → Autonomic: controls involuntary muscles • Sympathetic: expends energy; fight
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