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Questions and Answers
What is the role of the trigeminal ganglion in the neuronal pathway of fine sensibility?
What is the role of the trigeminal ganglion in the neuronal pathway of fine sensibility?
Where do the axons of the second neuron cross over in the brainstem?
Where do the axons of the second neuron cross over in the brainstem?
Which cranial nerve is associated with the superior and inferior ganglia?
Which cranial nerve is associated with the superior and inferior ganglia?
What is the endpoint of the thalamocortical tract?
What is the endpoint of the thalamocortical tract?
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What type of sensory information is transmitted through this pathway?
What type of sensory information is transmitted through this pathway?
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Study Notes
Neuronal Pathways of Fine Sensibility
- The pathway of fine sensibility originates from the contralateral part of the head and is responsible for transmitting information related to touch, discrimination, vibration, and pressure.
- This pathway also involves conscious proprioception, which is the ability to sense the position and movement of body parts.
First-Order Neurons
- The first-order neurons involved in this pathway are located in the trigeminal ganglion (CN V), geniculate ganglion (CN VII), and the superior and inferior ganglia of CN IX and CN X.
Second-Order Neurons
- The second-order neurons are found in the ipsilateral pontine nucleus of CN V.
- The axons of these neurons cross over in the brainstem and continue as the trigeminal lemniscus.
Third-Order Neurons
- The third-order neurons are located in the contralateral ventral posteromedial nucleus of the thalamus.
- The axons of these neurons form the thalamocortical tract, which passes through the internal capsule to the inferior part of the postcentral gyrus (sensory homunculus).
- The postcentral gyrus is organized in a specific way, with different areas responding to different parts of the body, forming the sensory homunculus.
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Description
This quiz covers the pathways of fine sensibility from the contralateral part of the head, including touch, discrimination, vibration, and pressure, as well as conscious proprioception.
