Vision. Structure of the Eye. Flashcards
What are the specialised senses of the body?
Vision.
Hearing.
Balance.
Taste.
Smell.
The organs that give rise to special senses are all located in what part of the body?
The head.
What kind of nerves carry information relating to the specialised senses?
Cranial nerves, not spinal nerves.
Do cranial nerves have 1st, 2nd and 3rd order neurons?
Yes.
What is the major difference between the nerves that carry specialised senses and normal nerves?
The nerves that carry specialised senses have a specialised receptor cell that picks up the stimulus.
What name is given to the ganglia in the brain?
Nuclei.
Where are sensory and motor nuclei located within the brain?
Sensory nuclei are located dorsally within the brainstem.
Motor nuclei are located ventrally within the brainstem.
What part of the brain will most cranial nerves originate from?
The nuclei of the brain stem.
Where do the 1st order neurons of special sensory organs run from and to?
From the sensory organs will travel into the brainstem.
For specialised sensory information, where does synapsis from 1st to 2nd order neurons occur?
In the brainstem.
Where do the 2nd order neurons of special sensory organs run from and to?
From the brainstem to the thalamic region.
For specialised sensory information, where does synapsis from 2nd to 3rd order neurons occur?
In the thalamus.
Where do the 3rd order neurons of special sensory organs run from and to?
From the thalamus to the area of the cortex that corresponds to the location where the stimulus was generated.
E.g. The visual cortex.
What cranial nerves do not have a specialised area of the cortex?
Cranial nerves 1 and 2.
What is vision?
The ability to see light.
