Annals of Anatomy · 2026

The External Carotid Artery: A Multimodal Anatomical Synthesis of Variants and Surgical Corridors

A narrative synthesis that treats the external carotid artery as a variable anatomical system rather than a fixed textbook trunk. The review spans bifurcation geometry, branch sequence, common trunks, osseous relationships, distal retromandibular course, and a practical CTA reporting framework.

Rusu MC · Dincă V · Tudose RC · Bănică DA · Ann Anat. 2026 Aug;267:152884 · PMID 42431518 · doi: 10.1016/j.aanat.2026.152884

This microsite condenses the paper into interactive reading paths. Use the buttons below to switch between anatomical logic, key findings, and practical implications.

Framework

A variable trunk, not a fixed textbook axis

The review argues that a useful ECA description must separate several dimensions of variability: bifurcation level, axial ICA–ECA arrangement, branch sequence, common trunks, skeletal relationships, and distal course.

Bifurcation level

Carotid bifurcation height is variable and should not be assumed from surface levels alone.

Branch sequence

Standard order is frequently modified by common trunks and sequential variants, especially around the ascending pharyngeal artery.

Distal course

The retromandibular/parotid segment introduces another independent layer of variation.

Take-home point: The most useful insight is not a single frequency but a CTA-ready framework for describing the ECA.

CTA reporting domains

1. Bifurcation geometryLevel and axial ECA–ICA spin.

2. Proximal branchesOrigin sequence, common trunks, and APA variants.

3. Osseous relationsHyoid, styloid, gonial and related corridor constraints.

4. Distal courseParotid–retromandibular trajectory and venous relationships.

The paper explicitly avoids pooling CTA and cadaveric prevalences as interchangeable metrics.
A structured report makes variant anatomy legible for surgeons and interventionalists.
The review also accommodates rare developmental phenotypes such as absence or persistence patterns.

Surgical corridors

Why osseous and soft-tissue corridors matter

The ECA is encountered in carotid, parotid, skull-base and endovascular settings. Therefore, its relation to the hyoid, styloid process, gonial angle and adjacent venous corridors is clinically meaningful.

Carotid surgery

Bifurcation level and axial spin affect exposure and vessel identification.

Parotid surgery

The distal retromandibular ECA course matters where glandular, venous and neural relationships converge.

Skull base

Styloid-related and pharyngeal corridor variants alter access geometry and compression patterns.

Take-home point: ECA variability becomes most intelligible when translated into surgical-corridor language.

Corridor logic

Anterior corridorHyoid and infrahyoid relationships shape access windows.

Lateral corridorParotid and retromandibular pathways intersect venous and neural structures.

Superior corridorStyloid-related constraints and skull-base branches influence reach and risk.

Landmarks themselves vary; the review stresses that “fixed” reference points may also be variable.
The ascending pharyngeal artery is given special attention because it disrupts simplistic branching expectations.
Topography and branching should be read together, not separately.

Rare phenotypes

Developmental and rare phenotypes still matter

Although uncommon, absence, persistence, unusual common trunks and extreme branching sequences can alter collateral circulation and procedural risk. The review keeps these rare forms visible instead of relegating them to footnotes.

Absence / persistence

Developmental remodelling may create non-standard supply routes with consequences for interpretation and intervention.

Occipitopharyngeal logic

Sequential variants around the occipital and ascending pharyngeal arteries change expectations at the very start of the ECA.

Reporting consequence

Rare anatomy should be named explicitly rather than forced into a “near normal” label.

Take-home point: Rare ECA phenotypes deserve explicit recognition because they may have major local consequences.

From common to rare

Expected patternStandard teaching remains a useful baseline.

Common variant patternCommon trunks and shifted branch sequence are frequent enough to anticipate.

Rare developmental patternAbsence/persistence phenotypes carry disproportionate procedural importance.

The framework is inclusive: it can accommodate frequent variants and one-off case phenotypes alike.
The review’s teaching value lies in showing that variability is systematic, not anecdotal.
Structured CTA reporting may improve communication across anatomy, radiology and surgery.