Bio 205 exam 3

Question Answer What does CNS Stand for and what does it consist of Central Nervous System
Consist of the brain and spinal cord What does PNS stand for Peripheal Nervous System What are the two parts of the PNS AFFERENT(sensory) and Efferent(motor) What are the Efferent divisions? Somatomotor(to skeletal muscle, voluntary movement)
Autonomic(to cardiac muscle, smooth muscle and glands) What are the Autonomic division Sympathetic (fight or flight)
Parasympathetic (resting and digesting) Neurons carry _________ Action potentials
-permanent tissue in most cases Dendrites carry _________ and where do they carry them? Local potentials to the cell body Define cell body(perikaryon) and what it consist of Nucleus, organelles, mitochondria, Nissl bodies
-summation of local potentials occur at the axon hillock
-hillock collects chemical and electrical signals Axons carry ______ Action potentials away from the cell body What are axon collaterals? Branches of the axon after the hillock What does the myelin sheath form and where does it form it? Insulation on the axon, axon terminals, terminal boutons Explain axoplasmic flow(transport) -retrograde Cell body –> axon
-slow stream
Slow like the milk man Explain axonal transport -now known as retrograde axoplasmic flow Cell body <a?? axon
-moderately fast via microtubules
-rabies virus – toxin produced returns to cell body Types of neurons – anaxonic -Many processes extend from the cell body
-no distinguishable axon
-found in brain and sense organs. (CNS)
***not the most common neurons found in the brain*** Types of neurons – unipolar -one extension from the cell body
-sensory neurons in PNS Types of neurons – multipolar -many extensions from the cell body
-motor neurons (PNS) and interneurons (CNS)
-most common CNS nervous type
– most common neurons found in the brain Types of neurons – bipolar -two extension from the cell body
-vision, olfactory neurons (only PNS) Sensory neurons – AFFERENT fibers Somatic – peripheral receptors
a??exteroreceptors
Visceral – monitor internal conditions
a??interoreceptors
a??proprioceptors Motor neurons – Efferent fibers Somatic – to skeletal muscle
Visceral – autonomic- to smooth and cardiac muscle and glands CNS
Define nerve tracts Groups of axons CNS
Define nuclei Collections of cell bodies PNS
Define nerves Groups of axons PNS
Define ganglia Collections of cell bodies Explain neuroglia -supporting cells of the Nervous System
-majority of cells are neuroglia
-different types in CNS and pns Neuroglia of the CNS Astrocytes
-Form part of the a??blood-brain barriera?? with capillaries
-NT uptake (glutamate and GABA)
-K+ uptake

Ependymal cells
-form choroid plexus
-forms CSF in ventricles

Microglia
-clean up

Oligodendrocytes
-myelin in CNS only
-one cell body w