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Nervous System Dr. C

Valencia Dr. Leroy Coleman

CNS Central Nervous System which consist of the brain, the spinal cord, and the peripheal
PNS Peripheal Nervous System which includes all nervous tissue outside the CNS
Nervous System Consist of 2 Subdivisions Central & Peripheal
Clusters of neuron cell bodies located outside the CNS are called Ganglia
Which functional divisons of the nervous system includes the SNS and ANS Motor
In the PNS,components of the afferent division include Sensory Neurons
Sensory Afferent Division Somatic and Visceral Sensory Nerve Fibers Conduct impulses from the receptors
Motor Efferent Division Motor Nerve Fibers Conduct Impulses from the CNS effectors (musles and glands)
ANS Autonomic Nervous System
Ans Divided into 2 subdivisions Sympathetic & Parasympathetic
Sympathetic Arises in Spinal Cord Flight of Fight (excited)Increase heartrate, Increased blood pressure
Parasympathetic Arises in Brain Feed or Breed (relaxed)increased digestion, reproduction, urination
Brachial Plexuses Formed by anterior Rami of C5-T1, innervates pectoral girdle, and entire upper limbs
Sensory Nervous System Transmits impulses from the PNS to the CNS includes pain touch pressure and temp
Neural Crest as neural tube forms some of ectodermal cells from the tube migrrate to form several layers of cells
Neural Tube the neural folds approach each other and fuse thus converting the neural plate
Mulitipolar Neurons usually have several dendrites and one axon In brain and spinal cord
Bipolor Neurons one main dendrite and one axonInretina of evey in inner ear and in olafactory
Dendrite Afferent unput or sensoryshort input from another axon at a sunapsis of sensory receptor
Axon Efferent output or motorlongmakes the nerve fiberconvered with axolemma
Interneurons Multipolar. many dendrites. In the cns.Brain communicates with different areas of itself recieves many inputs has many outputs
Motor Neurons Multipolar recieves information from many other interneurons tocause depolarization of the axonsends infoto an effector organ
Sensory Neursons Unipolar one process that is the sourch for both the sensory and motaar end
Special Sensory Neurons Found only in the special sensory prgans eye nose ear
Neuroglial Cells of the CNS-GLIAL TYPES (4) Astocyte, Microglial, Ependymal, Oligodendrocyte
Astrocyte Star Shaped CellsAttached to neurons capillaries and pia mater in CNS Blood Brain Barrier
Microglial Small star shapedReside in CNSeat any debris that makes it past the blood brain barrier
Ependymal Cells Cuboidal to ColumnarLine the Ventricles Cliated to move CSF
Oligodendrocytes Send processes that form thin sheets of the cell forms the white matter of the CNS
PNS Support Cells (2) Satellite & Schwann
Satellite Cells Surround the neuron body of sensory neurons in ganglia
Schwann Cells Make the myelin sheath for groups of axonsUnmyelinated nerves have Scwann Cells that only partially surround the axons
Somatic Senses include tactile sensations touch pressure vibration itch and tickle thermal senstaions warm and cold pain sensationsand proprioceptive sensations
Visceral Senses provide info about conditions within internal organs
Unipolar Neurons dendrites and one axon that are fused together to form a continuous process that emerges from the cell body
Spatial Summation summation of postsynaptic potentials in resonse to stimuli that occur at different lovations in the membrane of a postsynaptic cell at the same time
Temporal Summation summation pf postsynaptic potentials in resonse to stimuli that occur at the same location in the membrane of the postsynaptic cell but at different times
Acetylcholine Best Studied NeurotransmitterReleased by many PNS neurons and bo some CNS neurons. Excitatory
Epinephrine Serve as hormonesCells of the adrenal medulla the inner portion of the adrenal gland release them into bloodExcitatory & inhibitory
GABA found only in CNSControls stimulationAlcohol increases effect
Seratonin Many side effects more in females related to histamine the drug that causes inflammationMainly Inhibitory
Dopsmine more in males feel good hormoneExcitatory & Inhibitory
Presynaptic Neuron A neuron sending info to another
Postsynaptic Neuron A neuron receiving info from another
Cervical Plexuses is formed by the roots of the first four cervical nervessupplies the skin and muscles of the head neck and superior part of the shoulders and chest
Lumbar Plexuses Minimal interminging of fibers in the lumbar plexus. on either side of the firt four lumbar vertebrae the lumbar plexus passes obliquely outward between teh superficial and deep heads of the psoas major muscle
Olfactory Nerve Smell I
Optic Nerve Sight II
Oculomotor Nerve Eye Movements IIISomatic
Trochlear Nerve Pulls Eye Down IVSomatic
Trigeminal Nerve 3 Sets of Twins Feel where face is and whats going on V Somatic
Abducens Nerve Lateral Movements of the Eye VISomatic
Facial Nerve Facial Expressions VIIVisceral
Vestibulocochlear Get Info From Ear Equlibrium VIII
Glossopharyngeal Feels our throat and tell what to do IXSomatic & Visceral
Vagus Throat XSomatic & Visceral
Accessory Helps Spinal Nerves Moves Neck XISomatic
Hypoglossal Below tongue affects hyoid musle XIISomatic
Created by: Mszstlouis