Midterm 1 Flashcards
What does the Peripheral Nervous System consist of
Cranial nerves
Spinal Nerves
Ganglia
Name the classification of neurons
- pseudounipolar
- bipolar
- multipolar
What is the purpose of Schwann cells
they hold fibers in place
T/F
Perinerium = surrounds the entire nerve
epinerium = surrounding one fiber
Endonerium = surrounds the fascicle
False
Endonerium = surrounding one fiber
Epinerium = surrounding the nerve
perinerium = surrounding the fascicle
Where are the cell bodies of motor neurons are located in the CNS
Brainstem or spinal cord
Cell bodies of sensory neurons are located in where in the PNS
Dorsal root ganglion/ geniculate ganglion
Where are the Preganglionic sympathetic neurons located in the CNS
lateral horn of the spinal cord T1 to L2
Where are the Postganglionic sympathetic neurons located in the PNS
para and prevertebral ganglia - sympathetic chain
Cytoplasmic process of neuron usually ___ and ____
axon
coverings
Epineurium is connective tissue covering around several ___
fascicles
what is the AKA of a Schwann cell
neurolemma
T/F
Schwann cells are only found in CNS
False
only in PNS - always associated with all nerve fibers of PNS
Schwann cell wrapped with protein = ___
Schwann cell wrapped without protein= ___
- myelinated
- unmyelinated
T/F
most cells are unmyelinated
False most are
Nuclear material is made up of what
chromosomes
the phospholipid layer of the nucleus does what type of function
holds the nuclear membrane
The structural classification of a neuron is related to what
- where the nucleus lis located
- how many cellular processes enter or go off of nuclear area (cell body)
which type of neuron is most common in the body
Multipolar
Does Multipolar neurons carry efferent or afferent signals
Efferent ( mostly motor)
AKA for Unipolar
pseudounipolar
T/F
pseudo unipolar only carries sensory information
True
T/F
pseudounipolar has one cellular process on each side of the cell body
False that is Bipolar
in a pseudounipolar neuron… the dendritic side ____ and the axonal side _____
receives information
sends out information
( same goes for bipolar neurons)
____ neurons are only found in the head
Bipolar
Which neurons are associated with special senses like sight, hearing, taste and smell
Bipolar neurons
Name the organelles located in the cytoplasm and name their functions
- nucleus - control center
- Rough ER - Protein producer
- Smooth ER
- Lysosomes - self- destruction of cell
- mitochondria = energy producer
- Golgi bodies= storage ( proteins or glycoproteins)
- Cytoskeleton= transportation
describe what happens in a nerve injury ?
where does the lesion occur?
what degeneration is it usually called?
- lesion occurs distally —> myelin degenerates—-> debri left behind—>
- Wallerian degeneration
what is chromatolysis
cell body will change to survive
Anterograde Transport goes ___
Retrograde Transport goes ___
down
- up
Describe the Following
- Ventricular Zone
- Intermediate zone
- Marginal Zone
- Precursor cells ( increasing in numbers)
- Blast cells ( neuro/glial)
- Mature neurons ( fibers sending out called rays
