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Nervous System (Central Nervous System (CNS) (White matter (Axons &…
Nervous System
Central Nervous System (CNS)
Function
Receive & process sensory input
Integration
Location
Spinal Cord
Brain
White matter
Axons & Neuroglia
Myelin sheath surrounding axons
No neuron cell bodies
Communication through different parts of CNS
Gray matter
Ventral horn - motor neurons
Dorsal horn - interneurons
Clustered neuron cell bodies
Types of Sensory & Motor Fibers of PNS
Visceral Sensory
Stretch, pain, temperature, nausea, hunger
all organs in ventral body
Somatic Motor
Skeletal muscles
Somatic Sensory
Touch, pain, pressure, vibration, temperature
Proprioceptors - skin, body wall, limbs
Visceral Motor
Smooth muscle, cardiac muscle, and glands
Peripheral Nervous System (PNS)
Function
Transmit nerve impulse
Location
Cranial Nerves
Spinal Nerves
Nerves
Contains ganglions
Clusters of neuron cell bodies
Glial Cells
CNS
Ependymal cells
Lining of ventricles of brain
Microvilli & cilia
Simple cuboidal/columnar epithelium
Making of cerebralspinal fluid
Microglia
Decompose damages neural tissue
Defends against invaders
Mobile phagocytes of CNS
Astrocytes
Largest & most abundant
Maintain correct chemical environment
Oligodendrocytes
Forms myelin sheath around axons
Multiple processes
In brain & spinal cord
PNS
Schwann cells
Forms myelin sheath around axons
Myelinated & nonmyelinated
In fetal period and 1st year of postnatal life
Satellite cells
Structural support
Surrounding neuron cell bodies
Regulates exchange of materials