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Phys: Nervous System

Ch 13. Spinal Cord

QuestionAnswer
Autonamic Nervous System Efferent - Carries info from brain to target. Controls involuntary processes - vicersal functions > heart rate, digestions, respiration, salivation. Adjusts to maintain internal environment
Somatic Nervous System Afferent - carries info to the brain. Controls voluntary movements. Adjusts to external environment.
There are 2 types of nerve fibers. What are they? 1. Afferent - Sensory 2. Efferent - Motor
Afferent Nerve Fibers Relay impulses toward CNS Can be Somatic or Visceral
Somatic Afferent Fibers Relay impulses to the CNS from Skin, Skeletal Muscle or Joints
Visceral Afferent Fibers Relay impulses to the CNS from Visceral Organs - Heart, Stomach Etc.
Efferent Nerve Fibers - Motor Transmits impulses from CNS to target organ. These impulses activate muscles to contract or glands to secrete.
Somatic System - Sensory & Motor SNS neurons carry info to and from the brain. Both Sensory and Motor control voluntary processes or movements.
Somatic Sensory Afferent. Processes info that arrives from external stimuli hearing, touch, sight, pain - sends to cns
Somatic Motor Efferent. Resonsible for nearly all Voluntary skeletal muscle movement or contraction.
Visceral Sensory Afferent. Sends impulses of Stretch, pain, temp, nausea, hunger, taste and smell to CNS
Visceral Motor Efferent. Impulses are sent from CNS to effector Smooth muscle, Cardiac Muscle, and glands
What are the 2 divisions of the ANS? 1. Parasympathetic 2. Sympathetic
What is the Parasympathetic division responsible for? Rest & Digest Concerned with conserving energy and house keeping functions during rest.
What is the Sympathetic division responsible for? Stress. This is activated in extreme situations. (3Es) Exercise, Excitement, Emergencies
Ipsilateral Motor response is on the same side as sensory input
Contrlateral Motor response is on the opposite side as sensory input.
Inhibitory A reflex can inhibit the contraction of a muscle. Ex. Inverse Myotatic Reflex
Excitatory A reflex can stimulate the contraction of a muscle. Ex. Myotatic Reflex
Reciprocal Innervation A reflex that stimulates the flexor and stimulates the extensor simultaneously
Reciprocal Inhibition A reflex that inhibits the flexor and stimulates the extensor simultaneously.
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