Nerves Flashcards
exam 2
afferent
dendrites
efferent
axons/ nerve fibers
pulls away from the nerve fiber
perineurium
pseudounipolar
axon
bipolar
- sensory
- sensory organ
multipolar
visceral
motor
nissal bodies
rough ER- RNA
where nissel bodies are absent
axon hillock
will you find rough ER in the axon?
No! just in the cell body
large cells, nucleoulus present, and satellite cells in the periphery continous and nucleus in the middle
dorsal root (spinal) gnaglion- sensory
found in the muscle
myentric gnaglion
eccentric nuclei
multipolar
multipolar, eccentric nucleus, dispersed satellite
autonomic ganglion
first neuron cell body resides in
CNS
second neuron cell body resides in
peripheral ganglia
required for peristalsis
smooth muscle is perpendicular to nerve cells
exist as a plexus
enteric ganglia
neurokeratin is specific to
myelination
1:1 shwan cell to axon explain
for unmylinated axons one shwan cell will cover many of them but for mylinated axon there is a 1:1 relationship
reticular fibers will show black in
silver stain
neurokeratin found only in
myelinated nerves (somatic motor nerves too)
residual protein elements in myelin sheath following lipid extraction
neurokeratin
cross-section of mylenated axons you will find big cells
mitochondria
two rings in a myelinated neuron
Schmidt-lanterman
end to end junction between shwan cells
nodes of ranvier
why doe we need nodes of ranvier?
for Reflex!!!!
most of the autonomic nerve pathway is
unmylenated
perineural sheath
blood brain barrier
Cytoplasmic channels that allow nutrient exchange between the axon and the Schwann cell
Schmidt-Lanterman Clefts
A layer of connective tissue surrounding a single nerve fascicle of nerve fibers
perineurium
Transmission of impulses from periphery to spinal cord is accomplished by
Afferent sensory fibers and pseudounipolar neurons
Conduction in a peripheral nerve is MOST rapid when the axon is:
Wide and myelinated
