Nervous System Pathways
Nervous System Pathways ANAT 3001
U of M
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This 2 page Class Notes was uploaded by alliemartinnn Notetaker on Monday March 28, 2016. The Class Notes belongs to ANAT 3001 at University of Minnesota taught by Barnett, Vincent; Cook, Mark in Fall 2015. Since its upload, it has received 14 views. For similar materials see Human Anatomy in Anatomy at University of Minnesota.
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Date Created: 03/28/16
Pathways Pathways and Integrative Function ● Pathways ○ Spinocerebellar Pathway ■ Carries proprioception to Cerebellum through Lateral Funiculus ■ Composed of anterior and posterior spinocerebellar tracts ■ Damage to left or right side of this pathway results in reduced proprioception on both sides of the body and also some reduction in perception of pain and temperature of the opposite side ○ Corticospinal Pathway ■ 85% of fibers cross to the opposite side to get to the Medulla Oblongata; descend in the Lateral Funiculus to innervate the muscles ■ 15% of fibers pass through Medulla Oblongata without crossing until they get to the level of the innervated muscle (Anterior Funiculus) Autonomic Nervous System ● Aka Visceral System ● Sensations carried by the autonomic system can activate a somatic motor response, and vice versa ● Somatic Motor System vs Autonomic Motor System: Somatic Autonomic ■ Skeletal muscle ■ Requires 2 motor neurons ■ Causes excitation of skeletal (multipolar) muscles ■ Cardiac & smooth muscles, ■ Somatic motor neurons glands ■ Cause excitation or inhibition ■ Sympathetics ■ Parasympathetics ● Neuron ○ Somatic Motor Neuron ■ Neurotransmitter: Acetylcholine ■ Effector Organs: Skeletal muscle ○ Sympathetics ■ Neurotransmitter: Norepinephrine ■ Effector Organs: Smooth & cardiac muscle, glands ○ Parasympathetics ■ Neurotransmitter: Acetylcholine ■ Effector Organs: skeletal muscles ● Divisions of the Autonomic Nervous System ○ Sympathetic (Thoracolumbar) Division ■ Accommodate physiological needs of the body during physical activity ■ Also responsible for fight or flight ■ Exit the central nervous system between T1 and L2 levels of spinal cord ○ Parasympathetic (Craniosacral) Division ■ Accommodate physiological needs of the body during rest and digest ■ Heart rate, respiration, cardiac output decrease ■ Lung bronchioles decrease in size ■ Salivary glands and GI tract increase function ■ Cranial Nerves Involved in Parasympathetic Function ● III Oculomotor Nerve ○ Acetylcholine released in the front of the eyeball ○ Control pupil size (constrict) ○ Control thickness of lens (thicken) ● VII Facial Nerve ○ Control lacrimation ○ Control salivation (from submandibular and sublingual salivary glands) ● IX Glossopharyngeal Nerve ● X Vagus Nerve
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