8 - Vascular Scaffold

Question 1

SC segments with most gray matter

Answer 1

• Lower cervical and lumbosacral enlargements
  
  • Upper, lower limbs

Question 2

SC segments with most white matter

Answer 2

• More rostral segments
• Greatest at cervical levels, least at sacral

Question 3

Gray matter in SC

Answer 3

• Middle (stained white)
• Contains all neurons/cell bodies
• Three Components:
  
  • Dorsal gray horn
  • Intermediate gray matter
    
    • Lateral horn if applicable
  • Ventral gray horn

Question 4

White matter in SC

Answer 4

• Outer (strained dark)
• 3 main axon bundles
  
  • Dorsal funiculus (aka dorsal column)
    
    • Divided into cuneate, gracilis fascicului
  • Lateral funiculus
  • Ventral funiculus
    
    • Connected to each side by ventral white commissure

Question 5

Answer 5

A) Dorsal gray horn

B) Intermediate gray zone

C) Lateral horn (T1-L2)

D) Ventral gray horn

Question 6

Answer 6

A) Fasciculus gracilis

B) Fasciculus cuneatus

(A+B) = Dorsal Funiculus/Dorsal Column

C) Dorsal median sulcus

D) Dorsal intermediate sulcus

E) Ventral funiculus

F) Ventral white commissure

G) Lateral Funiculus

Question 7

Dorsal Funiculus

Answer 7

• Comprised of fasciculi gracilis and cuneatus
  
  • Only present at cervical and upper thoracic levels
  • Below mid-thoracis, no cuneatus, just gracilis
• Ends at the lower medulla

Question 8

Ventral Horn Landmark

Answer 8

Lateral part is not present at thoracic levels

Question 9

Lateral Horn Landmark

Answer 9

Only present at T1-L2

Question 10

Fascicului landmark

Answer 10

• Gracilis is present at everylevel
• Cuneatus is only present at cervical and upper thoracic levels (~T5 and up)

Question 11

Arterial Vasocarona

Answer 11

• ASA, PSA Anastamoses in SC
• Supply the peripheral lateral aspect of SC white matter
• Sporadically reinfoced by collateral spinal medullary arteries

Question 12

Rhombencephalon

Answer 12

Medulla + Pons