Sensory Pathways (DCM & STT)

What is the function of the STT

discriminative temperature

discriminative pain

crude touch

Sensory receptors in the STT

nocioceptors & thermoreceptors

Where is the cell body of the first-order neuron in the STT

dorsal root ganglion

Describe the STT pathway of the proximal axon of the first-order neuron

enters ipsilateral dorsal horn

Where does the first order neuron synapse of the STT

ipsilateral dorsal horn

Where does the STT decussate

same level as 1st order neuron

Describe the STT pathway of the second-order neuron

cell body in ipsilateral dorsal horn--> immediately decussates to contralateral ventral horn --> ascends in anterolateral white matter --> VPL of thalamus

Where does the second-order neuron terminate in the STT

VPL of thalamus

Where is the cell body for the third-order neuron in the STT

VPL of thalamus

Through where does the third-order neuron project in the STT

internal capsule

Where does the third order neuron terminate in the STT

S1

What is the function of the DCML

discriminative touch

vibration

proprioception

Sensory receptors in the DCML

mechanoreceptors and proprioceptors

In the DCML, where is the cell body of the first-order neuron

dorsal root ganglion

Describe the DCML pathway of the proximal axon of the first-order neuron

enters the ipsilateral dorsal horn --> ipsilatearl dorsal column --> medulla

What is the name of the part of the spinal cord associated with tactile information from the lower extremities

fasciculus gracilis

What is the name of the part of the spinal cord associated with tactile informatio nfrom the upper extremities

fasciculus cuneatus

Where does the first-order neuron terminate in the DCML

nucleus gracilis/cuneatus in medulla

Where is the cell body for the second-order neuron in the DCML

nucleus gracilis/cuneatus in medulla

Where does the DCML decussate

in medulla

Where does the second order neuron terminate in the DCML

VPL of thalamus

Where is the cell body for the third-order neuron in the DCML

VPL of thalamus

Through where does the third-order neuron project in the DCML

internal capsule

Where does the third-order neuron terminate in the DCML

S1