Tutorial title - Somatosensory Pathways
8 important questions on Tutorial title - Somatosensory Pathways
What is the pathway of 1st order sensory neurons?
How many cervical, thoracic, lumbar and sacral dorsal root ganglia are there that take information from the sensory receptors to the spinal cord then the thalamus and brain?
Thoracic = 12 pairs
Lumbar = 5 pairs
Sacral - 5 pairs
Neurons at the circuit level have 3 functional regions, what are these regions called?
- Receptive region
- Conducting region
- Secretory region
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How many steps do the mechanosensory pathways have from the face to the primary somatosensory cortex? List these steps in the order of flow
Mechanosensory receptors from the face → principal nucleus of trigeminal complex via the trigeminal ganglion → medial lemniscus → trigeminal lemniscus → ventral posterior medial nucleus of the thalamus → primary somatosensory cortex
What 3 purposes do the mechanosensory pathways of the face serve? Through what nerve allows the sense of texture, pressure, and position across the face and mouth.
- fine touch discrimination
- proprioceptive feedback for jaw movement
- protective reflexes
Through the trigeminal nerve
What does the thalamus project into the primary somatosensory cortex and somatosensory association area that results in the conscious image of the stimulus
What does the primary somatosensory cortex do and from where does it receive information from?
Where is the somatosensory association cortex located
What does it do to the sensory information received from the thalamus into the primary somatosensory cortex?
What is the ultimate result of this processing?
- integrates various sensory inputs to form a comprehensive understanding of the stimulus
- determines the quality, magnitude, size, texture, shape, and pattern of the stimulus, as well as the relationship of its parts
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