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NeuroAnatomyTracts

Neuro Pathways

QuestionAnswer
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