1. Anatomy: Soft tissue - Brain Parenchyma

Question 1

Central SulcusSS

Answer 1

Separates - Frontal from parietal lobe

This is called the “pars bracket sign” - because the bi-hemispheric symmetric pars marginalis form an anteriorly open bracket. The bracket is immediately behind the central sulcus. This is
present about 95% o f the time - it’s actually pretty reliable

Question 2

Central Sulcus Trivia

Answer 2

Superior frontal sulcus / Pre-central sulcus sign: The posterior end o f the superior frontal sulcus joins the pre-central sulcus

Inverted omega (sigmoid hook) corresponds to the motor hand

Question 3

Homunculous Trivia

Answer 3

The inverted omega (posteriorly directed knob) on the central sulcus /
gyrus designates the motor cortex controlling hand function.

ACA territory gets legs

MCA territory hits the rest

Question 4

Answer 4

Cavum Septum Pellucidum

-100% of preterm infants,
-15% of adults.
-Rarely, can cause hydrocephalus
-Anterior to the foramen of Monroe
-Between frontal horns

Question 5

Answer 5

Cavum Vergae

• Posterior continuation of the cavum septum pellucidum (never exists
  without a cavum septum pellucidum)
  -Posterior to the foramen of Monroe
  -Between bodies of lateral ventricles

Question 6

Answer 6

Cavum Velum Interposition

Extension of the Quadrigeminal plate cistern to foreamen of Monroe

Seen above the 3rd ventricle and below the fornices

Question 7

Ventricular anatomy

Answer 7

You have 2 lateral ventricles = foraman of Monro = communicate with the 3rd ventricle = cerebral aqueduct = 4th ventricle = Median aperture (foramen of Magndie = Lateral aperture (foramen of Lushka)

Blockage at any site = Noncommunicating hydrocephalus

Blockage of reabsorption at the villi/granulation = non communicating hydrocephalus

Question 8

These are regions where the arachnoid projects into the venous system allowing for CSF to be reabsorbed.

Answer 8

Arachnoid Granulations

CT: Hypodense, round (clot in a venous sinus - linear)

MRL T2 bright (iso to CSF), bright FLAIR

Question 9

Basal cisterns are good for?

Answer 9

1. Evaluating mass effect
2. Anatomy Questions. haha

Question 10

Cistern anatomy

Answer 10

Supracellar Cistern = STAR

Top of the Star = Interhemispheric fissure
Lateral points = Sylvian cisterns
Posterior points = Ambient cisterns
Quadrigeminatl plate = smile

Question 11

Cistern anatomy sagittal

Answer 11

Question 12

Midbrain Tectum vs Tegmentum

Answer 12

Think of the midbrain as a Monky face