Neuronal Structure + Classification Flashcards
What are the regions in the structure of a neuron?
- dendrites
- cell body (perikaryon & nucleus)
- axon
- telodendria
Daw a diagram of the structure of a neurone and label it’s regions
slide 3
Draw a more detailed diagram of a neurone
slide 4
What are shwann cells?
Fatty layers that form the myelin sheath, that wraps around the axon
Where are synaptic terminals located on a neurone cell?
The ends of the telodendria
What are the 4 classifications of neurones?
- anaxonic
- bipolar
- unipolar
- multipolar
(slide 7)
What is a anaxonic neurone?
- have more than 2 processes
- all dendrites, no axon
- brain & special sense organs
(slide 7)
What is a bipolar neurone?
- 2 processes separated by the cell body
- rare: special sense organs
(slide 7)
What is a unipolar neurone?
- single elongated process
- cell body located in the middle but off to the side
- common sensory type
What is a multipolar neurone?
‘typical’ neurone
- more than 2 processes
- single axon but multiple dendrites
- somatic motor and autonomic nerves
Draw diagrams of all 4 classifications of neurones
slide 7
What is the difference between efferent autonomic nerve pathways and efferent somatic pathways?
- efferent autonomic nerve pathways have a 2-neurone arrangement, comprising a pre- and a post-ganglionic nerve
- efferent somatic pathways have a single neurone that extends from the CNS to the effector
(slide 8)
What are the three types of neurons based on the direction of nerve impulse conduction?
- sensory (afferent) neurons
- association neurons (interneurons)
- motor (efferent) neurons
(slide 8)
What is the function of sensory neurons?
- transmit nerve impulses from receptors to the CNS
- from lower to higher CNS levels
What is the function of association neurons?
- connect sensory and motor neurons
- facilitate the processing and integration of neural information
