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VW Spinal Cord Path
IS-B1-Spinal Cord Pathways
Question | Answer |
---|---|
What is the name of the spinal cord pathway described here? PRG (neuron 1) -> Substantia Gelatinosa (neuron 2) -> NAME OF TRACT HERE -> Thalamus (ventral posterolateral nucleus - neuron 3) -> Thalamocortical fibers -> Postcentral Gyrus | Anterolateral System - Lateral Spinothalamic Tract |
What is the name of the spinal cord pathway described here? PRG (neuron 1) -> Nucleus Proprius (neuron 2) ->NAME OF TRACT HERE -> Thalamus (ventral posterolateral nucleus - neuron 3) -> Thalamocortical fibers -> Postcentral Gyrus | Anterolateral Systems - Anterior Spinothalamic Tract |
What is the name of the spinal cord pathway described here? PRG (neuron 1) -> Fasciculus/Nucleus Gracilis or Cuneatus (neuron 2) -> NAME OF TRACT HERE -> Thalamus (ventral posterolateral nucleus - neuron3) -> Thalamocortical fibers ->postcentral gyrus | Posterior Columns/Medial Lemniscus |
Pain and Temperature are sensed using which Tract and which System? | Lateral Spinothalamic Tract , ALS |
General Tactile - Crude and Light Touch are sensed using which Tract and which System? | Anterior Spinothalamic Tract, ALS |
Conscious proprioception and fine or discriminatory touch are sensed using which Tract/System? | Posterior Columns/ Medial Lemniscus (PC/ML) |
What is the name of the spinal cord pathway described here? PRG (neuron 1) -> NAME OF TRACT HERE -> Dorsal nucleus of clarke/nucleus proprius/lateral cuneate nucleus (N2) -> Inf or Sup cerebellar peduncle -> cerebellum | Posterior and Anterior Spinocerebellar Tracts |
Reflex proprioception uses what tracts? | Posterior and Anterior Spinocerebellar Tracts |
Describe the 3 neurons in the sensory pathway. | receptor (pseudounipolar), relay from lower center to thalamus, relay from thalamus to cortex |
Describe the 3 tracts in the sensory pathway. | axons in cord from dorsal column, relay axons from medial lemniscus to thalamus, relay axons from thalamus to cortex (thalamocortical tracts) |
Describe the 2 neurons in the motor pathway | 1 in cortex sending signal to spinal cord (UMN) and 1 in spinal cord sending info to the muscle (LMN) |
Describe the 2 tracts in the motor pathway | corticospinal neurons -> peripheral nerves |
Describe the pathway of a spinal reflex (6 steps) | Stimulus -> receptor -> afferent pathway -> integration center -> efferent pathway -> effector organ |
What does this describe: Muscle spindle/golgi tendon organ -> dorsal root ganglion -> integration center -> motor output -> alpha motor neuron -> muscle innervation | Spinal Reflex |
First order neurons are _ neurons whose cell bodies are located in the dorsal root ganglion. | Pseudounipolar |
This pathway is used to test the integrity of the nervous system and the location of lesions. | ALS |
The spinothalamic tract of the ALS crosses in the _. | Spinal cord |
If there is a lesion in the peripheral nerve, where will a loss of pain and temperature occur when investigating the ALS? | At that dermatome level, ipsilaterally |
If there is a lesion in the spinothalamic tract (after crossing) in the ALS, where will a loss of pain and temperature occur? | Contralateral side, below the level of the lesion. |
Describe the path of the ALS | 1st order neuron from PRG enters SC through posterolateral fasciculus -> synapse in Substantia Gelatinosa ->2nd order cross in anterior white commissure and become the ALS contralaterally which then ascend to thalamus -> postcentral gyrus |
True or False - the PC/ML pathway does not cross in the spinal cord. | TRUE |
What are the differences between the ALS and the PC/ML? | The ALS contains pain and temp receptors while the PC/ML contains discriminatory touch and vibration receptors. The ALS crosses in the spinal cord but the PC/ML does not. |
Where does the PC/ML pathway cross? | In the caudal medulla |
Describe the path of the PC/ML from T6 and above | 1st order neuron from PRG enters SC through posterolateral fasciculus -> Enter Fasciculus Cuneatus -> ascends to medulla to synapse on 2nd order neurons in the Nucleus Cuneatus. |
Describe the path of the PC/ML from below T6 | 1st order neurons from the PRG enters SC through posterolateral fascculus -> Enter Fasciculus Gracilis -> ascends to medulla to synapse on 2nd order neurons in the Nucleus Gracilus. |
Describe the 3 main Tracts for Reflex Proprioception | Anterior Spinocerebellar - Lower Extremities, Posterior Spinocerebellar - Lower Extremities, Cuneocerebellar - Upper Extremities and Neck |
Cerebellar influences are ipsilateral, contralateral, or both? | Ipsilateral |
This disease is a cavitation of the central canal which destroys the anterior white commissural fibers of the ALS - pain sensation lost bilaterally. | Syringomyella |
This disease follows a spinal hemisection. Pain and temp are lost contralateral to the lesion, paralysis and posterior column information are lost ipsilaterally. | Brown-Sequard Syndrome |
The cell bodies of this pathway originate from the cerebral motor cortex in the _central gyrus or paracentral lobule, and their axons from the _ tract. | Voluntary Motor Pathway - precentral gyrus, corticospinal tract |
UMN cell bodies are located in the precentral gyrus or the _ lobule. | Paracentral |
The axons of the UMN are called the corticospinal tract in the brain, will decussate in the _, and continue as the _ _ tract in the spinal cord. | caudal medulla (pyramids), lateral corticospinal tract |
LMN cell bodies are in the _ _ of the spinal cord | Anterior horn |
IF the lesion is ABOVE the cross point, the issue will be seen _laterally. | Contralaterally |
IF the lesion is BELOW the cross point, the issue will be seen _laterally. | Ipsilaterally |