Labs

Question 1

Claustrum

Answer 1

• GRAY MATTER
• Multisensory integration

Question 2

Two parts of corpus callosum

Answer 2

Genu (anterior) and splenium (posterior)

Question 3

Optic Radiation

Answer 3

Connects lateral geniculate nucleus of thalamus to the primary visual cortex

Question 4

Recurrent Artery of Heubner

Answer 4

• Branch of the ACA
• Irrigates caudate nucleus head, anterior limb of the internal capsule

Question 5

Innervation of Posterior Limb of Internal Capsule

Answer 5

• Anterior choroidal artery
• ALSO SUPPLIES GENU!

Question 6

Innervation of Lentiform Nucleus

Answer 6

Lenticulostriate arteries

Question 7

Anterior Commissure

Answer 7

• In brain (SC is anterior/ventral white commissure)
• Separates BG into motor and reward systems
• Below: ventral pallidum and ventral striatum

Question 8

Anterior Choroidal Artery

Answer 8

• Transverse: genu, posterior limb of internal capsule
• Coronal: innermost globus pallidus, posterior limb of internal capsule, hippocampus

Question 9

CT

Answer 9

• X-rays (high radiation)
• Fast
• Easy
• Good for shape of brain, ventricles
• 3D availability
• White: bone, blood
• Dark: CSF

Question 10

MRI Function, Types

Answer 10

• Hydrogen nuclei that are aligned, then perturbed by magnets
• T1: myelin is bright, ventricles (Water) is dark
  
  • DOES NOT SHOW LESIONS
• T2: water is white, fat appears dark
  
  • Lesions & CSF appear
• FLAIR: water is DARK, white matter is less dark, gray matter is least dark
  
  • Shows lesions clearly but NOT ACUTE STROKES
• DWI: identifies acute stroke based on water movement (lesion is bright white)

Question 11

DTI

Answer 11

Special type of DWI (MRI) that shoes white matter tractography

Question 12

CT vs MRI: How to Remember

Answer 12

• CT: thick white rim (bone + blood)
  
  • CSF = dark
• T1: gray matter is darker than white matter
• T2: gray matter is lighter than white matter
  
  • CSF is LIGHT
• FLAIR: gray matter is lighter than white matter
  
  • CSF is dark