Nervous System Flashcards
(27 cards)
What are the 4 neuralgia of the CNS (brain and spinal)
Astrocytes
Microglia
Oligodendrocytes
Ependymal cells
Astrocytes
Connect neurons to blood vessels
Part of blood brain barrier
Regulate ion contractions
Microglia
Phagocytic cell (consumes solids)
Oligodendrocytes
Myelin CNS axons
Ependymal cells
Regulate composition of cerebral spinal fluid (CSF)
Multiple sclerosis
Destruction of myelin sheath by immune response
Scars are left behind which stop neurons from conducting impulses without input and muscles stop contracting atrophy
Symptoms:fatigue,weak,and numb limbs
Sensory neurons
Carry impulse to CNS
Interneurons
Link neurons located in CNS
Motor neurons
Carry impulses away from CNS and towards effectors
General function of neuroglia
Provided structural support for neurons
Schwann cells
Produce myelin found on peripheral axons
Satellite cells
Supporting clusters of neuron
What is the nervous system
Detects changes , make decisions, stimulates muscles and glands (effectors), and maintain homeostasis
What are two cell types
Neurons and neuroglia
Neurons
React to changes
Send impulses for communication
Neuroglia
Support neurons
Central nervous system(CNS)
Brain and spinal cord
Peripheral nervous system (PNS)
Cranial nerves
Spinal nerves
Sensory function
Changes are detected
Information is delivered to the brain
Integrative function (brain)
Use sensory info to make decisions on body’s response
Motor functions
Decisions are acted upon
Impulses are carried to effectors
Neurons
Vary in size and shape
May differ in length
Share certain features
Cell body(soma)
Nucleus,cytoplasm,organelles
Dendrites
Branches receptive surfaces
