Neurons in the PNS Flashcards
1
Q
Types of neurons in the PNS
A
- afferent
- efferent
2
Q
Afferent neurons
A
- transmits messages to the CNS
- cell bodies typically outside of the CNS
3
Q
Efferent neurons
A
- transmits messages from the CNS
- somatic division has cell bodies in the CNS
- autonomic division has cell bodies inside both CNS and PNS
4
Q
Bundles of axons
A
- in the CNS: tracts (white matter)
- in the PNS: nerves
5
Q
Grouping of cell bodies
A
- in the CNS: nuclei
- in the PNS: ganglia
6
Q
Ganglia
A
- ones associated with afferent fibres contains cell bodies of afferent neurons
- ones associated with efferent fibres contain cell bodies from the ANS
7
Q
Nerves
A
- bundles of neuron fibres outside the CNS
- sensory nerve: carry afferent fibres
- motor nerve: carry efferent fibres
- mixed nerve: can carry both
8
Q
Structure of nerves
A
- includes bundles of axons, blood and lymph vessels, and connective Tissue sheaths
- endoneurium, perineurium, epineurium
- vary in size
- neurons can be myelinated or un myelinated
9
Q
Endoneurium
A
-covers neuron fibres
10
Q
Perineurium
A
-covers groups of fibres/fibre bundles/fascicles
11
Q
Epineurium
A
- covers many fascicles
- form the nerve
