## Location of the Trigeminal Ganglion **Key Point:** The trigeminal ganglion is housed in a specialized dural recess called Meckel's cave (or trigeminal cave), located in the middle cranial fossa. ### Anatomical Details **High-Yield:** Meckel's cave is a pocket of dura mater that lies in the petrous part of the temporal bone, just lateral to the cavernous sinus. It is bounded: - **Medially:** by the cavernous sinus - **Laterally:** by the petrous temporal bone - **Posteriorly:** by the petro-occipital fissure - **Anteriorly:** by the foramen lacerum ### Clinical Significance **Clinical Pearl:** Meckel's cave can be affected by: - Trigeminal schwannomas (benign tumors of the trigeminal nerve) - Meningeal inflammation or infection - Aneurysms of the cavernous sinus - Pituitary apoplexy (can compress the ganglion) MRI imaging of Meckel's cave is important for detecting pathology of the trigeminal nerve at its origin. **Mnemonic:** **"MECKEL'S = Middle cranial fossa, Extradural (between bone and dura), Cavernous sinus lateral, Keeps the trigeminal ganglion"** 
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