1.11 Spinal Cord Pathways II

This tract is contralateral and ascending
a. Posterior Columns (Medial Lemniscus Pathway)
b. Lateral Spinothalamic Tract (Lissauer's Tract)
c. Lateral Corticospinal Tract (Pyramidal Tract)
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Terms in this set (26)
This tract is contralateral and ascending
a. Posterior Columns (Medial Lemniscus Pathway)
b. Lateral Spinothalamic Tract (Lissauer's Tract)
c. Lateral Corticospinal Tract (Pyramidal Tract)
b
Ascending sensory pathway that conveys sensory pain & temperature with 3 synapsing neurons
a. Posterior Columns (Medial Lemniscus Pathway)
b. Lateral Spinothalamic Tract (Lissauer's Tract)
c. Lateral Corticospinal Tract (Pyramidal Tract)
b
When the first neuron enters the tract it does NOT immediately cross in this pathway
a. Posterior Columns (Medial Lemniscus Pathway)
b. Lateral Spinothalamic Tract (Lissauer's Tract)
c. Lateral Corticospinal Tract (Pyramidal Tract)
b
How many levels do the nerve fibers enter before crossing into the Spinothalamic tract?
3
In a SC injury, the patient will lose ___ dermatomes in the injured side and a TOTAL loss on the opposite side
3
Explain how Lissauer's Tract is like getting up to the anatomy lab in EH
You enter the front door (first sc level) and immediately take those front elevators up to the 3rd floor (3rd sc level).
In order to get all the way up to the anatomy lab (6th floor) (brain/postcentral gyrus), you must walk through the 3rd floor hallway (anterior white commissure) to the other set of elevators (spinothalamic tract) and take them up to the anatomy lab (brain/poscentral gyrus).
a small fiber tract that carries the Pain/Temp fibers up 2-3 segments BEFORE it crosses over is called:
a. Pyramidal decussation
b. VPL (ventral posterolateral nucleus of the thalamus)
c. Medial Lemniscus
d. Lissauer's Tract
e. Anterior White Commissure
d
In Lissauer's Pathway, the ____ neuron travels up the lateral spinothalamic tract
a. 1st
b. 2nd
c. 3rd
b
In Lissauer's Pathway, the ____ neuron travels up to the postcentral gyrus
a. 1st
b. 2nd
c. 3rd
c
loss of pain, temp, vibration, proprioception, weakness, increased tone and reflexes,

voluntary
...
Spinal cord is cut in half on the right side at thoracic level 2 or 3. Would you expect an UMNL, LMNL, or both AT the level of the problem?both (UMNL LMNL innervates dermatome at level 2/3)(check this) Spinal cord is cut in half on the right side at thoracic level 2 or 3. Would you expect an UMNL, LMNL, or both BELOW the level of the problem?UMNL (LMNL still in tact)(important) After Spinal Cord injury where the spine is cut in *half*, where will you find proprioception loss? Where will you find pain/temp loss? *(AKA Brown-Séquard syndrome)*1. Ipsilateral Hemiparesis at the level and below the lesion (corticospinal tract) 2. Ipsilateral proprioception/discriminative touch loss (posterior columns) 3. Contralateral & *2-3 segments *down pain/temp loss (spinothalamic tract crosses contralaterally)(REVIEW THIS) C6 injury will cause these consequences at the medial lemniscus pathway and CST:MLP/posterior column (cuneatus): loss of proprioception in hand/forearm/elbow ispilaterally corticospinal tract: total loss of motor function at and below C6 on the same side (UMNL) loss of reflex arc at this level (same side) biceps and triceps; And hyperactivity of reflexes below, since corticospinal tract not sending inhibitory signals(REVIEW THIS) L2 injury affecting the spinothalamic tract and the corticospinal tract will cause the following deficits:loss of pain and temp on opposite side Loss below L5 (3 below) decreased reflex at L2 (knee jerk) LMNL at L2The Posterior Columns are also known as: a. Medial Lemniscus Pathway b. Lissauer's Tract c. Pyramidal TractaThe Lateral Spinothalamic Tract is also known as: a. Medial Lemniscus Pathway b. Lissauer's Tract c. Pyramidal TractbThe Lateral Corticospinal Tract is also known as: a. Medial Lemniscus Pathway b. Lissauer's Tract c. Pyramidal TractcWhich is involved in ipsilateral touch and vibration? a. Medial Lemniscus Pathway b. Lissauer's Tract c. Pyramidal Tracta (*P*roprioception = *P*osterior columns = Medial Lemniscus)Which fasciculus in the Medial Lemniscus/Posterior Column pathway is found in the cervical spine only?cuneatusWhich fasciculus in the Medial Lemniscus/Posterior Column pathway is found in the thoracic --> sacral spine?gracilis(KNOW THIS) In going from the 2nd to 3rd neuron in the posterior column pathway, where is the decussation? a. Pyramidal decussation b. VPL (ventral posterolateral nucleus of the thalamus) c. Medial Lemniscus d. Lissauer's Tract e. Anterior White Commissurec (makes sense -- medial lemniscus pathway)Which is involved in ipsilateral motor function? a. Medial Lemniscus Pathway b. Lissauer's Tract c. Pyramidal TractcWhich is involved in *contralateral temperature and pain?* a. Medial Lemniscus Pathway b. Lissauer's Tract c. Pyramidal Tractb (*P*ain + *T*emp = s*P*ino*T*halamic = Lissauer's)Where do the neurons decussate in Lissauer's Tract? a. Pyramidal decussation b. VPL (ventral posterolateral nucleus of the thalamus) c. Medial Lemniscus d. Lissauer's Tract e. Anterior White Commissuree (at the dorsal horn)An injury to the Lateral spinothalamic tract at L2 will cause the following injury: a. loss of ipsilateral temperature and pain b. loss of ipsilateral temperature and pain L2-5, loss of function contralaterally below L5 c. loss of motor function at ipsilateral L2 d. loss of motor function at vibration/proprioception ipsilateral L2 e. loss of motor function at vibration/proprioception contralateral L2b