PSB-2000 Lecture Notes - Lecture 4: Autonomic Nervous System, Parasympathetic Nervous System, Sagittal Plane
Document Summary
Gross anatomy of the nervous system: somatic nervous system (1 neuron bridges csn-periphery) Controlled by cortex: autonomic nervous system (2 neuron chain from cns to target) Autonomic control of visceral organs and glands. Axons activate organs for immediate energy expenditure. Fight or flight : ganglia near spinal cord, lumbar and thoracic regions, acetylcholine and norepinephrine. Parasympathetic nervous system axons direct organs for vegetative non-emergency functions. Rest and digest : ganglia near target organ, ganglion afferents in brain and sacral spinal cord, acetylcholine only, pns provides sensory afferents and motor efferents to the cns. Most enter/exit ventral surface of brainstem sensory and motor for head and face important in neurological exams some have autonomic component: the spinal cord. Conveys messages to and from the brain. Spinal nerves convey information between spinal cord and the body. Bell-magendie law: the entering dorsal roots carry sensory information to the brain and the exiting ventral roots carry motor information to the muscles and glands.
