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NeuroAnatomyTracts
Neuro Pathways
| Question | Answer |
|---|---|
| What does the Dorsal-Column Medial Lemniscal System sense? | Somatic Sensory Light, pressure, position, vibration and discriminative touch for the body and posterior head. |
| What does the Trigeminal mechanosensory system sense? | Somatic sensory Light, pressure, position, vibration and discriminative touch for the face. |
| What does the anterolateral system sense? | Somatic sensory Pain, temperature and crude touch for the body and posterior head |
| What does the spinal trigeminal system sense? | Somatic sensory Pain, temperature and crude touch for the face |
| What does the corticospinal/corticobulbar pathway sense? | Motor pathway for voluntary movements and posture |
| Sensations for pressure, vibration, discriminative touch from the UPPER extremities take which tract, the Cuneate or Gracile Tract of the DCML system? | Cuneate Tract Mechanical Somatic Sensation |
| Sensations for pressure, vibration, discriminative touch from the LOWER extremities take which tract, the Cuneate or Gracile Tract of the DCML system? | Gracile Tract Mechanical Somatic Sensation |
| Which tract is more medial, the gracile or cuneate tract? | The Gracile Tract from the lower extremities |
| Where does the neuron cross over the spinal midline in the Dorsal Column Medial Lemniscal system? | Caudal Medulla after synapsing at either the Cuneate Nucleus or Gracile Nucleus |
| What are the internal arcuate fibers? | Fibers that arise in the cuneate and gracile nuclei, pass in a curving course across the midline of the medulla oblongata, and form the contralateral medial lemniscus |
| What does the anterolateral system sense? | Pain and temperature for the body and posterior head |
| Where does a neuron in the anterolateral system go after it leaves the receptor? | It enters at the DORSAL ROOT GANGLION -- it SYNAPSES in the DORSAL HORN. The neuron then CROSSES THE MIDLINE and ASCENDS along the ANTEROLATERAL edge on of the spinal cord. It then enters the thalamus and goes to the primary somatic sensory cortex |
| What does the corticospinal/corticobulbar pathways do? | Motor pathways for voluntary movements in the lower face and extremities |
| What is the internal capsule? | Area of white matter in the brain where corticospinal/bulbar axons run towards the midbrain. |
| Where do 90-95% of corticospinal tract neurons decussate? | In the caudal Medulla at the Pyramidal Decussation |
| What is the action of 90-95% of the corticospinal neurons? | Skilled Voluntary movement of the distal extremities |
| After decussation, which tract does the majority of neurons run along? In other words, where in the spinal cord do these neurons run? | Lateral Corticospinal Tract in the White Matter |
| If an axon doesn't take the Lateral Corticospinal Tract, which corticospinal tract does it take? | Ventral Corticospinal Tract |
| What does the corticobulbar pathway do? | The motor cranial nerves use this pathway for voluntary facial movement |
Created by:
alison.simpson
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