Pyramidal Decussation

Question 1

Nucleus Gracilis
Function:
Location:

Answer 1

• Relay well localized touch, pressure & vibratory sense

- Nuclei in the caudal medulla that are the end points for fasiculus gracilis\cuneatus

Question 2

Fasiculus gracilis

Answer 2

• Relay well localized touch, pressure & vibratory sense from the legs
• In the dorsal funiculus of the spinal cord
• Make up the dorsal columns

Question 3

Fasciculus cuneatus

Answer 3

• Relay well localized touch, pressure & vibratory sense from the arms
• In the dorsal funiculus of the spinal cord
• Make up the dorsal columns

Question 4

Nucleus cuneatus

Answer 4

• Relay well localized touch, pressure & vibratory sense

- Nuclei in the caudal medulla that are the end points for fasiculus gracilis\cuneatus

Question 5

Spinal tract of trigeminal

Answer 5

• Pain & temperature sensory information, 1st order receptors for CN III.
• Run through the lateral medulla

Question 6

Spinal nucleus of trigeminal

Answer 6

• Termination of temperature & sensory information from CN III
• Lateral brain stem

Question 7

Lateral corticospinal tract

Answer 7

• Fine movement of the ipsilateral limb

Question 8

Anterolateral system

Answer 8

• Pain, tempreture & crude touch
• Three ascending pathways
  
  1. Spinothalamic tracts
  2. Spinoreticulotract
  3. Spinotectal tracts

Question 9

Spinal Accessory motor neuron

Answer 9

CN XI

Question 10

Medullary Pyramid or Pyramid

Answer 10

• Skilled Motor movements of the contralateral limb

- Vental medulla, containing decussated fibers from the corticospinal tract

Question 11

Pyrimidal decussation

Answer 11

• Decussation of corticospinal tracts

- Junction between brainstem & spinal cord

Question 12

Central Canal

Answer 12

• Connects 4th ventrical with the spinal cord

- Obex of the medulla