ANAT 1615 Lecture Exam 1 REVIEW

ANAT 1615 Lecture Exam 1 REVIEW - G rossAnatomy...

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Gross Anatomy Exam 1 Lecture Notes 2 Sets of Peripheral Nerves : 1. Cranial Nerves - nerves that emerge directly from the brain. 12 pairs. 2. Spinal Nerves - generally refers to the mixed spinal nerve, which is formed from the dorsal and ventral roots that come out of the spinal cord. spinal nerve passes out of the vertebrae through the Intervertebral Foramen all spinal nerves are part of the PNS Dorsal horns: receives sensory input from the body, including light touch, proprioception, and vibration. This information is sent from receptors of the skin, bones, and joints through sensory neurons whose cell bodies lie in the dorsal root ganglion. Information from a sensory toward the spinal cord through a dendrite. Receptors dendrite (toward spinal cord) I.V.F sensory neurons in dorsal root ganglion (DRG) dorsal horn in spinal cord Ventral horns: responsible for motor output. contains motor neurons that affect the axial muscles. Carries information through an axon away from the spinal cord. Ventral horn in spinal cord axon (away from spinal cord) I.V.F motor end plate Action Potential movement away from the spinal cord- Axon (from ventral horn) Action Potential movement toward the spinal cord- Dendrite (to dorsal horn) Dorsal root ganglion/Spinal Ganglion: contain afferents axons- relay sensory information into the brain and spinal cord (CNS) psuedounipolar neurons - have an axon with 2 branches that act as 1 single axon no synapses multipolar neuron: single axon with many dendrites , allowing for integration of a great deal of information from other neurons. motor end plate: in the Neuromuscular junction, is the highly excitable region of muscle fiber plasma membrane responsible for initiation of action potentials across the muscles surface causes muscle contraction. located only in skeletal muscle; there for control of sk. muscle movement. General Somatic Efferent Fibers: arise from motor neuron cell bodies in the ventral horns of the gray matter in the spinal cord. exit the spinal cord through the ventral roots carries motor impulses to skeletal muscles carries information Out General Somatic Afferent Fibers: arise from cells in the spinal ganglia (dorsal root ganglia)
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and are found in all the spinal nerves conduct impulses of pain, touch, and temperature from the surface of the body through the: posterior roots to the spinal cord and impulses of muscle sense. carries information In Rules to Remember about the Autonomic Nervous System: 1. *Always a 2 neuron Chain * innervates 3 items: smooth muscle glands cardiac muscle 2. 1 st Neuron is always listed in the CNS preganglionic neuron 3. 2 nd neuron always in the periphery any neuron in periphery (outside the CNS) is located in ganglion. 1 or many postganglionic neuron
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This note was uploaded on 11/21/2011 for the course ANAT 1615 taught by Professor Samueldemons during the Fall '10 term at Life Chiropractic College West.

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ANAT 1615 Lecture Exam 1 REVIEW - G rossAnatomy...

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