Mastoid Canaliculus Of The Temporal Bone, Posterior View

Description

Mastoid canaliculus is highlighted on the posterior aspect of the temporal bone as a minute foramen on the lateral wall of the jugular fossa. In this fixed posterior view, it sits inferior to the sigmoid sulcus and medial to the mastoid process, near the transition between the mastoid and petrous parts of the temporal bone. The opening is shown in relationship to neighboring landmarks that orient the posterior cranial base, including the external occipital surface of the squamous temporal region, the mastoid notch (digastric groove), and the margin of the jugular foramen. Small, easy to miss. Clinically, the mastoid canaliculus matters because it transmits the auricular branch of the vagus nerve (Arnold nerve) and associated vascular twigs, creating a direct anatomical link between the jugular fossa region and sensory innervation of the external acoustic meatus and conchal bowl. Otologic symptoms such as cough triggered by ear-canal stimulation (Arnold reflex) gain anatomical plausibility when learners can localize this canaliculus relative to the jugular bulb impression and the posterior surface landmarks used in temporal bone orientation. The posterior perspective supports surgical and radiologic discussions by keeping the jugular fossa, sigmoid sulcus, and mastoid region in the same frame, which is where pathology such as a high-riding jugular bulb or jugular foramen lesions are commonly mapped to bony boundaries. Use this illustration in head and neck anatomy courses when teaching the skull base foramina and the vagus nerve’s extracranial branches, or in otology and neurotology materials that correlate temporal bone anatomy with referred otalgia and vagal reflexes. It also suits atlases and journal figures that require precise labeling of the jugular fossa wall and adjacent posterior temporal bone landmarks. Anatomical accuracy verified by SciePro's Medical Advisory Board.