Anterior Cerebral Artery

Question 1

Proximal segment of ACA (A1-A2) PERFORATING branches

Answer 1

Medial lentriculostriate arteries, recurrent artery of Heurbner, callosal perforating arteries (may give rise to a median artery of the corpus callosum)

Question 2

Proximal segment of ACA (A1-A2) CORTICAL branches

Answer 2

A2- Orbitofrontal (AKA medial orbitofrontal), frontopolar

Question 3

Distal segment of ACA (A3-A5)

Answer 3

A3- Callosomarginal (anterior internal frontal, middle internal frontal, posterior internal frontal); A4- Paracentral; A5- Pericallosal (superior parietal, inferior parietal)

Question 4

Summary of ACA segments

Answer 4

Proximal- A1-A2; Distal- A3-A5

Question 5

Summary of cortical branches of ACA

Answer 5

A2- Orbitofrontal (AKA medial orbitofrontal), frontopolar A3- Callosomarginal (anterior internal frontal, middle internal frontal, posterior internal frontal) A4- Paracentral A5- Pericallosal (superior parietal, inferior parietal)

Question 6

Summary of cortical branches of ACA

Answer 6

A2- Orbitofrontal (AKA medial orbitofrontal), frontopolar A3- Callosomarginal (anterior internal frontal, middle internal frontal, posterior internal frontal) A4- Paracentral A5- Pericallosal (superior parietal, inferior parietal)

Question 7

Recurrent artery of Heubner

Answer 7

Contralateral hemiparesis with facial and bracial predominance (anterior limb of internal capsule), aphasia (if dominant lobe)

Question 8

Anatomic variants of DACA (Youmans and Winn)

Answer 8

Type I- AZYGOUS (single, unpaired A2); Type II- BIHEMISPHERIC (single DACA supplies both hemisphere); Type III- ACCESSORY (triplication of A2)