PNS & CNS basic info Flashcards
What is a collection of nerve cell bodies called in the PNS?
Ganglion
What cells maintain myelin sheaths in PNS?
Schwann Cells
What is a collection of nerve cell bodies called in CNS?
Nucleus
What cells maintain myelin sheaths in CNS?
Oligodendrocytes
What are the defining features of a multipolar neuron?
- Body in CNS
- 2 or more dendrites
- Make up all motor neurons of skeletal muscle and Autonomic nervous system
What are the defining features of a unipolar neuron?
- Cell body in PNS
- Double process
- Assoc with sensory part of nervous system
Where can spinal nerves be found?
Intervertebral foramen
What is a dermatome? and name some important dermatomal land mark
A dermatome is an area of skin supplied by one spinal nerve
- T4 = nipple
-T10 = Umbilicus
What is a myotome?
Area of skeletal muscle supplied by one spinal nerve
What nerve roots contribute to the cervical plexus and where does this supply?
C1-C4
Posterior scalp, neck & diaphragm
What nerve roots contribute to the brachial plexus and where does this supply?
C5-T1
Upper limb
What nerve roots contribute to the Lumbar plexus and where does this supply?
L1-L4
Lower limb
What nerve roots contribute to the sacral plexus and where does this supply?
L5 - S4
Lower limb, Gluteal region & perineum
What spinal nerve roots do sympathetic nerves leave to enter sympathetic chain?
T1-L2
What are the 4 ways that signals from the sympathetic chain can leave?
- Travel up and then synapse, then hitch a ride on arteries (internal carotid) to get to head and neck
- Synapse at this level, then exit at that level and go and do something at that same level
- Travel down through the chain, synapse and then eventually hitch a ride on arteries again
- NOT synapse but travel straight through in an abdominopelvic splanchnic nerve (organs of abdomen and pelvis)
- These then eventually synapse in prevertebral ganglia
