The anterior communicating artery connects which two vessels?

Explanation

## Anterior Communicating Artery — Anatomical Course **Key Point:** The anterior communicating artery (AComm) is a short midline vessel that creates the anterior limb of the Circle of Willis by connecting the two anterior cerebral arteries. ### Anatomical Pathway ```mermaid flowchart LR A[Left ICA] -->|terminal branch| B[Left ACA] C[Right ICA] -->|terminal branch| D[Right ACA] B -->|AComm| D style B fill:#e8f5e9 style D fill:#e8f5e9 style A fill:#f3e5f5 style C fill:#f3e5f5 ``` ### Key Anatomical Features - **Origin:** Both anterior cerebral arteries (terminal branches of the internal carotid arteries) - **Course:** Short midline vessel crossing above the optic chiasm and lamina terminalis - **Length:** Typically 3–5 mm (highly variable, 0–10 mm) - **Diameter:** Usually 1–2 mm - **Position:** Anterior to the lamina terminalis, posterior to the frontal lobes **High-Yield:** The AComm is the most common site of **berry aneurysm** formation in the Circle of Willis (30–35% of all berry aneurysms), making it clinically critical. ### Clinical Significance **Warning:** A ruptured anterior communicating artery aneurysm causes: - Subarachnoid hemorrhage (SAH) with sudden thunderclap headache - Cognitive and behavioral changes (due to frontal lobe involvement) - Memory disturbance (anterior communicating artery syndrome) - Abulia and personality changes **Clinical Pearl:** Anterior communicating artery aneurysm rupture is the most common cause of SAH in younger patients and carries high morbidity due to cognitive sequelae even after successful repair. ### Mnemonic: "AComm = A-to-A" **A**nterior communicating artery connects **A**nterior cerebral arteries (left and right)