Tracts

Question 1

Lateral corticospinal

Answer 1

• primary motor cortex
• pyramidal decussation @ cervicomedullary junction @ level of formamen magnum
• entire cord
• movement of contralateral limbs

Question 2

Rubrospinal tract

Answer 2

• Red nucleus, magnocellular division in midbrain
• ventral regimental decussation in midbrain
• cervical cord
• movement of contralateral limb

Question 3

Anterior corticospinal tract

Answer 3

• primary motor cortex
• N/A
• cervical and upper thoracic cord
• control of bilateral axial and girdle muscles

Question 4

Vestibulospinal tract

Answer 4

-Medial: medial and inferior vestibular nuclei (medulla)
Lateral: lateral vestibular nucleus (pons)
-N/A
-medial: cervical and upper thoracic cord
Lateral: entire cord
-medial: position of head and neck
Lateral: balance

Question 5

Tectospinal

Answer 5

• superior colliculus in midbrain
• dorsal tegmental decussation in midbrain
• cervical cord
• coordination of head and eye movements

Question 6

Reticulospinal tract

Answer 6

• Pontine and medullary reticular formation
• N/A
• entire cord
• automatic posture and gait related movements

Question 7

Dorsal column pathway

Answer 7

• hair receptor
• internal arcuate fibers in inferior medulla
• primary somatosensory cortex
• convey conscious proprioception, fine/discriminate touch, vibration

NG or NC -> VLP in thal-> primary somatosensory

Question 8

Spinothalamic tract

Answer 8

• bare nerve ending
• anterior comminsure 2-3 segments up
• primary somatosensory cortex
• contralateral pain, temp, crude touch a few segments below SC level

Dorsal horn—> VPL in thal -> primary somatosensory cortex

Question 9

Spinoreticular

Answer 9

• bare nerve ending
• anterior commisure 2-3 segments up then into anterolateral pathway
• pontine reticular formation in medulla
• behavior, emotion, arousal, autonomic response to pain

Question 10

Spinomesencephalic tract

Answer 10

• bare nerve ending
• anterior comminsure then ascends in anterolateral pathway
• peri aqueduct always gray matter and superior colliculus
• central modulation of pain

Question 11

(Ipsilateral) UMN signs below lesion

Answer 11

Lateral corticospinal tract

Question 12

Ipsilateral loss of proprioception, fine touch, vibration at and below level of lesion

Answer 12

Dorsal column pathway

Question 13

(Contralateral) loss of pain and temp beginning a few levels below lesion/ at and below

Answer 13

Spinothalamic

Question 14

Ipsilateral LMN signs at level of lesion

Answer 14

Anterior horn cells/ventral root

Question 15

Ipsilateral loss of pain and temp at level of lesion and a few levels below

Answer 15

Dorsal horn/anterior commisure