18 Questions
Where are the cell bodies of afferents in the trigeminal nerve (except those conveying proprioception) located?
Dorsal root ganglion
Which nucleus mediates fine touch stimuli, joint position, and vibration in the trigeminal nerve pathway?
Chief sensory nucleus
The trigeminothalamic tract provides somatic sensation to which parts of the body?
Head and neck
Where does the spinal nucleus of the trigeminal nerve extend into?
Spinal cord
Which part of the brain stem houses the trigeminal sensory nucleus?
Pons
Which nucleus mediates pain and temperature sensations in the trigeminal nerve pathway?
Spinal nucleus
Where does the central process make synaptic connections that mediate spinal reflexes and intersegmental coordination?
In the spinal gray matter
Where does the second neuron have its cell body?
In the spinal cord
Which structure does the Axon of the third neuron pass through before reaching the somatosensory cortex?
Thalamus
What is the function of the dorsal (posterior) columns in the spinal cord?
Running from the spinal cord to the medulla
Where does the main fiber of the central process remain?
On the ipsilateral side of the cord
Which part of the central nervous system does the Axon of the second neuron cross over to?
Opposite side of the CNS
Where are the cell bodies of proprioceptive afferents from the muscles of mastication and the temporomandibular joint located?
In the mesencephalic nucleus of the trigeminal
Where do the axons of 2nd order neurons in the trigeminal nucleus decussate?
In the ventroposteromedial (VPM) nucleus of the thalamus
Where do 3rd order neurons in the thalamus project to?
Primary sensory cortex
Which part of the brain houses the mesencephalic nucleus of the trigeminal?
Medulla oblongata
Which structure receives input from 2nd order neurons in the trigeminal nucleus?
Ventroposteromedial (VPM) nucleus of the thalamus
What is the function of 3rd order neurons in the thalamus?
Project to the postcentral gyrus
Test your knowledge on the synaptic connections involved in spinal reflexes and intersegmental coordination. Learn about the central processes and second-order neurons in the spinal gray matter or brainstem. This quiz is based on information from Trinity College Dublin, The University of Dublin.
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