Main somatosensory pathways (including neurons, ascending spinal cord tracts and sensory information)
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48 Terms
Where does the spinothalamic pathway begin?
At sensory receptors in the skin, muscles, or organs
What is the main function of the spinothalamic pathway?
Conduct crude touch, deep pressure, pain, and temperature to the brain
Where do first‑order neurons travel?
From receptors into the posterior gray horn
What is the function of first‑order neurons?
Transmit sensory input into the CNS and synapse in sensory nuclei
Where are sensory nuclei located?
In the posterior gray horns of the spinal cord
What is the function of sensory nuclei?
Process incoming sensory input before relay to second‑order neurons
Where do second‑order neurons begin?
In the sensory nuclei of the posterior gray horn
What is the function of second‑order neurons?
Decussate and carry sensory information up the spinal cord to the thalamus
Where does the anterior spinothalamic tract run?
In the anterior white columns
What sensory information does the anterior spinothalamic tract conduct?
Crude touch and deep pressure
Where does the lateral spinothalamic tract run?
In the lateral white columns
What sensory information does the lateral spinothalamic tract conduct?
Pain and temperature
Where do second‑order neurons synapse?
In the thalamus
What is the function of the thalamus in this pathway?
Relay sensory information to the cerebral cortex
Where do third‑order neurons begin?
In the thalamus
What is the function of third‑order neurons?
Transmit sensory information to the primary somatosensory cortex (PSC)
Where does conscious perception of spinothalamic sensations occur?
In the primary somatosensory cortex
What is the function of the PSC?
Allows conscious awareness of touch, pressure, pain, and temperature
Where does the posterior column pathway begin?
At tactile receptors and proprioceptors in the body
What is the main function of the posterior column pathway?
Conduct fine touch, light pressure, vibration, and proprioception to the brain
Where do first‑order neurons travel in the posterior column pathway?
From receptors into the posterior gray horn and then up the spinal cord to the medulla oblongata
What is the function of first‑order neurons in this pathway?
Carry sensory input the entire length of the spinal cord without synapsing until the medulla
Where do first‑order neurons ascend?
In the fasciculus gracilis or fasciculus cuneatus tracts
What is the function of these tracts?
Transmit fine touch, vibration, light pressure, and proprioception from the body to the medulla
Where do first‑order neurons synapse?
In the medulla oblongata
What is the significance of this synapse?
Marks the transition to second‑order neurons that will decussate
Where do second‑order neurons begin?
In the medulla oblongata
What is the function of second‑order neurons?
Decussate and carry sensory information to the thalamus
Where do second‑order neurons synapse?
In the thalamus
What is the function of the thalamus in this pathway?
Relay sensory information to the cerebral cortex
Where do third‑order neurons begin?
In the thalamus
What is the function of third‑order neurons?
Transmit sensory information to the primary somatosensory cortex (PSC)
Where does conscious perception of PCML sensations occur?
In the primary somatosensory cortex
What sensations are consciously perceived here?
Fine touch, vibration, light pressure, and proprioception
Where does the spinocerebellar pathway begin?
At proprioceptors in muscles, tendons, and joints
What is the main function of the spinocerebellar pathway?
Conduct unconscious proprioceptive information to the cerebellum
Where do first‑order neurons travel?
From proprioceptors into the posterior gray horn
What is the function of first‑order neurons?
Transmit proprioceptive input into the CNS and synapse in sensory nuclei
Where are sensory nuclei located for this pathway?
In the posterior gray horns of the spinal cord
What is the function of these sensory nuclei?
Relay proprioceptive information to second‑order neurons
Where do second‑order neurons begin?
In the sensory nuclei of the posterior gray horn
What is the function of second‑order neurons?
Carry proprioceptive information up the spinal cord to the cerebellum
Where do second‑order neurons ascend?
In the anterior or posterior spinocerebellar tracts
What is the function of the spinocerebellar tracts?
Transmit unconscious proprioceptive information to the cerebellum
Where does the spinocerebellar pathway terminate?
In the cerebellum
What is the function of the cerebellum in this pathway?
Uses proprioceptive input to maintain posture, balance, and coordinated movement
Where is proprioceptive information processed consciously?
Not in the cerebrum; this pathway does not reach the PSC
What is the significance of this?
Spinocerebellar input supports coordination but does not produce conscious sensation