Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
|
where are bipolar neurons found?
|
sense organs
|
|
|
what is the most common type of neuron in the body?
|
multipolar neuron. this is a classic motor neuron
|
|
|
where are pseudounipolar neurons found?
|
spinal and cranial ganglia
|
|
|
what are the Nissl bodies?
|
when stained, when stained, the cytoplasm of neurons is dark because of the large amount of ER and free ribosomes.
|
|
|
where is the initial site of action potential generation?
|
initial segment of axon
|
|
|
what is the cytoplasm within the initial segment of the axon called?
|
axon hillock
|
|
|
what is important about staining of the axon hillock?
|
the Nissl bodies are absent
|
|
|
what are lipofuscin granules?
|
accumulated debris when lysosomal degradation in the neuron cannot be completed.
|
|
|
what is the simplest and most common type of sensory ending? is the fiber myelinated?
|
"free ending." dendrite terminal branches simply taper to points. fibers are un- or lightly myelinated.
|
|
|
what is a muscle spindle? what does it do?
|
sensory organ within skeletal muscle. 8-10 modified skeletal muscle fibers (intrafusal fibers) with central nuclei, all surrounded by connective tissue capsule. it is a stretch receptor
|
|
|
what are annulospiral endings?
|
sensory endings wrapped around the nuclear regions of the muscle spindle
|
|
|
what are flower spray endings?
|
sensory endings wrapped around the non-nuclear striated regions of the muscle spindle
|
|
|
where are Pacinian Corpuscles and what do they sense?
|
they are deep in the dermis and sense deep pressure
|
|
|
where are Meissner's corpuscles and what do they sense?
|
found in dermal papillae and they are sensitive mechanoreceptors
|
|
|
where are Merkel cells found and what are they a part of?
|
found in skin basal layer and are part of a mechanosensory complex. they are not encapsulated
|
|
|
where are Ruffini's endings found?
|
encapsulated receptors in dermis and joints. they sense pressure and touch.
|
