Week 1 Flashcards
(26 cards)
PNS is subdivided into?
Sensory (afferent) & Motor (efferent)
Sensory is subdivided into
Somatic and visceral
Motor is subdivided into
Somatic and Autonomic
Autonomic is subdivided into
Sympathetic & Parasympathetic
Sympathetic is also known as
fight or flight or fawn
Parasympathetic is also known as
Rest and Digest
Central Nervous System consists of?
Brain and Spinal Cord
What are the 3 main functions of the nervous system
Receive Integrate and Respond
What does the PNS consist of
everything else
What are the two main types of cells?
Nuerons & Neuroglia
What do Neurons do?
Respond to stimuli, transmit electrical impulses
what do neuroglia do?
- support, insulate and protect neurons
What are the 4 types of neuroglia in the cns
astrocytes, microglial cells, Ependymal cells
What to do astrocytes do
CNS
- Most abundant and versatileof neuroglia
- provide scaffolding for neurons and capillaries
- control chemical environment
What do microglial cells do?
CNS
- Monitor health of neurons
- Act as macrophage when needed
Ependymal cells do?
CNS
- Line areas in brain and spila cord filled with CSF
- Create permeable barrier between csf and cells in the cns
Oligodendrocytes
process wrap around nerve fibers forming mylen sheath
Satellite and Schwann Cells
Satellite: similar to astrocytes - provide structure
Schwann Cells: similar to oligodendrocytes form the myelin sheath
What are the two main types of nervous tissue cells
neurons and nueroglia
what do satelite cells and astroctye ceslla hve in common, how are they different?
both provide scaffolding - astrocytes cns satellites - pns
What is the myelin sheath?
fatty substance that wraps around the neurons - insulation
what three special characteristics do neurons have
- extreme longevity
- amitotic
- high metabolism
What is the resting membrane potential? which type of gates contribute?
-70mv, leak channels and na+/k+ pump
What are the 4 steps of an action potential? which gates contribute to each step?
Resting state, Depolarization , Repolarization and Hyperpolarization, resting.
