Flashcards in Ascending and Descending Pathway Deck (88)
Generally what are ascending pathways main modality?
Generally what are descending pathways main modality?
What column is involved with Fine Touch and conscious proprioception?
Dorsal Column / Medial Lemniscus system
What divides the upper and lower fasciculus in the DCML?
Cutaneous receptors below T6 trigger an AP which travels along what?
Cutaneous receptors above T6 trigger an AP which travels along what?
Fibres from below T6 synapse where?
Nuclei Grascilis - within medulla
Fibres from above T6 synapse where?
Nuclei Cutanea - within medulla
At what level do neurones from the DCML cross over?
Level of the medulla.
Where within the brain do 2nd order neurones synapse?
Ventral Posterolateral Nuclei - within the thalamus
Where within the brain do 3rd order neurones synapse?
Primary somatosensory cortex
Post Central Gyrus
3rd order neurones travel within this to reach the primary somatosensory cortex.
Posterior Internal Capsule
If originating above T6 where do 1st order neurones synapse?
Nucleus Cutanea - within medulla
What tract deals with Pain Temperature and deep pressure?
Spinothalmic tract / Anterolateral Column
Generally what cutaneous receptors deal with pain?
Where do 1st order neurones synapse within the spinothalmic tract?
At what level do neurones of Spinothalmic tract cross over?
At the level it synapses they cross over before climbing anterolaterally.
Where do second order neurones synapse within the spinothalmic tract?
Pass through straight to the ventral Posterolateral Nucleus
Where are motor action potentials generated?
From where do Upper Motor Neurones originate and where do they synapse?
Originate at precentral gyrus
Synapse within anterior horn.
Within the Midbrain where do UMN pass?
Where within the medulla do the UMN pass?
Pyramids of the medulla, located on the anterior portion.
What percentage of UMN cross laterally at the level of the medulla?
If the UMN cross laterally at the level of the medulla what are they referred to as?
Lateral Corticospinal tract
If the UMN don't cross and descend ipsilateral to side of origin what are the UMN referred to as?
Anterior Corticspinal tract
Where do UMN of the anterior corticospinal tract cross over to synapse?
At level of synapse they cross over to the opposite anterior horn to join the lateral corticospinal tract.
Once synapsed where do both the lateral and anterior corticospinal tracts exit the spinal column?
From the anterior horn.
What is the function of the Tectospinal Tract?
Mediate reflex head and neck movement due to visual stimuli
What is the function of the Reticulospinal tract?
Influences voluntary movement