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Concept Map for Nervous Per.5 Mikaela Hernandez - Coggle Diagram
Concept Map for Nervous
Per.5
Mikaela Hernandez
CNS and PNS
CNS:The central nervous system include the brain and spinal cord of dorsal cavity its responsible for proccessing and deciding what output is necessary
PNS:The peripheral nervous system is the portion of the nervous system outside the CNS, its mainly based off of the nerves from the brain and spinal cord (spinal and cranial nerves)
Sensory:afferent
Somatic sensory fibers:convey impulses from skin,skeletal muscles,and joints
Visceral sensory fibers:convey from visceral organs to CNS
Motor:efferent
-transmits impulses from CNS to effector organ (muscles and glands)
Somatic nervous system(voluntary)
-somatic nerve fibers conduct impulses from CNS to Skeletal
-conscious control
Autonomic nervous system(involuntary)
-consists of visceral motor nerve fibers
-regulates smooth,cardiac musles and glands
-two subdivisions
sympathetic and parasympathetic
Neurons
Neuron cell body:AKA perikaryon or soma
-biosynthetic center of neuron
-synthesizes proteins,membranes,and chemicals
-contains nucleus with nucleolus
-most neuron cell bodies are located in CNS
-Nuclei-clusters-CNS
-Ganglia-Clusters-PNS
Multipolar:3 or more processes
bipolar 2 processes
Unipolar 1 process
Major function of the nervous system
The nervous system is responsible for:controlling and communicating
Integration:Proccessing the information given
Motor output:Activation of organ to produnce a response
Sensory input:info gathered by receptors
Tissues
Neuroglia(glial cells):small cells that surround and wrap neurons
Astrocytes:
-most abundandt and verastile
-cling to neurons,synaptic endings, and capillaaries
-functions:
-support and brace neurons
-play role in exchanges
-guide migration of young neurons
-control chemical environment around neurons
-influence neuronal functioning
-participate in formation processing in brain
Microglial cells:small ovoid cells with thorny processes that touch and monitor neurons
-migrate toward injured neurons
Ependymal cells:range in shape from squamous to columnar
-may be ciliated
-line central cavities of the brain and spinal column
Oligodendrocytes:branched cells
-processes wrao CNS nerve fibers,forming insulating myelin sheaths
Neurons(nerve cells):excitable cells that transmit electrical signals
connective tissue coverings
Major parts and functions of the spinal cord
Major Parts and functions of the Brain
Major sulci
that divides lobes:
Central sulcus
:divides precentral gyrus of fronta lobe and postcentral gyrus
Parieto-occipital
sulcus:seperates occipital and parietal lobes
Hemisphere:
Cerebral cortex
of gray matter superficially
white matter
internally
basal nuclei
deep in white matter
Cerebral cortex:Mind awareness, sensory perceotion,voluntary motor initiation
-40% of mass or brain
Motor areas
:control voluntary movement
Sensory areas
:conscious awareness of sensation
Association areas
:integrate diverse information
Lobes:parietal,occipital,temporal,frontal
Cerebellum:posterior portion of brain connects to spinal cord