Class 1 Deck 1 Flashcards
(49 cards)
What are the 3 major functions of the Nervous system?
- Sensory (monitor environment via receptors)
- Integration (Interpret sensory info)
- Motor (Response to info)
What are the 2 types of neural cells in the nervous system?
- Neuroglia
- Neurons
What does neuroglia (glial) cells do?
-Support, regulate and protect neurons
What do neuron cell do?
-Process, transfer and store information
What are the glial cells of the CNS? PNS?
- CNS = Astrocytes, Oligodendrocytes, microglia, ependymal
- PNS = Schwann, Satellite
What type of nervous system cell generally has the malignancy?
Glial
What type of cell creates the blood brain barrier?
Astrocytes
What functions does the astrocyte have?
- Frame work for neuron
- regulate interstitial fluid around nerve
- Chemical for neuron formation
- Scar tissue after CNS injury
What does the oligodendrocytte do?
-Create mylein sheath
What transmits impulses faster myelinated or unmyelinated neurons?
Myelinated
What does the microglia cells do?
- Brain macrophages
- Pagocytize cell waste and pathogens
What do ependymal cells do?
- Lines central canal of spinal column and ventricular cavities
- Involved in CSF secretion
Where is CSF made?
Ventricular cavities
What is the role of the schwann cell?
- Creates neurilemma
- Creates myelin sheath around axons of PNS
What does the neurilemma do?
-Regeneration of damaged axons
What does the satellite cells of the PNS do?
-Support cell bodies of neurons within the ganglia of the PNS
How many neurons can an oligodendrocyte myelinate? Schwann Cell?
- More than one
- Only one
T/F nerve cells can regenerate in the CNS.
-False, nerve cells can only regenerate in the PNS
What are the two main roles of the neuron?
- Structural unit of the nervous system
- Receives and conducts stimuli
What are the 3 components of the neuron?
- Cell body
- Axon (carries impulses away)
- Dendrites
What are the 2 functions of the neuron?
- Sensory (afferent) - receives sensory input
- Motor (efferent) - Control effector tissue
Name and describe the 3 structural classes of neurons.
- Multipolar (many dendrites / one axon) Motor
- Bipolar (1 dendrite / 1 axon) rare: eye, ear, nose only
- Unipolar (cell body outside the axon) sensory & reflex
Name the 3 classifications of neuron and what they do and the structure.
- Sensory / afferent (sensory info to the brain) mostly unipolar
- Motor / efferent (motor info from brain to periphery) multipolar
- Association / interneurons (Most common, info between neurons, analyze input, coordinate output) multipolar
Axons bundle together form _____ in the PNS and ________ in the CNS. Since both these are myelinated they are also known as _______.
- Nerves
- Tract/pathways
- White matter