A 9 CNS Pathways

Question 0

Which two major motor pathways are responsible for voluntary movements?

Answer 0

• Corticospinal (body)

- Corticobulbar (head)

Question 1

What CNS lesions are abbreviated in TINNTING?

Answer 1

Trauma, Ischemia, Neoplasm, Neuro-degenerative diseases, Toxins, Infection, Nutritional deficiencies, Genetic.

Question 2

Which two motor systems fine-tune voluntary motions?

Answer 2

• Cerebellum

- Basal ganglia

Question 3

What pathways are responsible for pain, temp and crude touch to body and face?

Answer 3

• Spinothalamic (anterolateral)

- Trigeminothalamic

Question 4

What two systems are responsible for conscious proprioception and discriminative touch?

Answer 4

• Dorsal Column Medial Lemniscus (DCML) (body)

- Trigeminothalamic (face, same as pain/temp/crude touch)

Question 5

What are the pathways that sense nonconscious proprioception?

Answer 5

• Dorsal spinocerebellar/ cuneocerebellar

- Ventral spinocerebellar

Question 6

What is the full path of the corticospinal tract?

Answer 6

Starts in cortex, parietal, temporal, frontal lobes.
Passes through internal capsule of diencephalon
Passes through cerebral peduncle of midbrain
Passes through pons, medulla.
In medulla, splits into lateral 90% & anterior corticospinal tracts.

Question 7

What is the full path of the spinothalamic tract?

Answer 7

1: DRG neuron synapses in ipsi dorsal horn ( recall leseaures tracts)
2: Immediately crosses ventral white commissure THEN ascends anterolateral (spinothalamic) tract to synapse on thalamus
3: thalamus to sensory cortex