## Anatomy of the Trigeminal Nerve ### Trigeminal Ganglion Location **Key Point:** The trigeminal (semilunar) ganglion is located in the **trigeminal cave (Meckel's cave)**, which is a dural recess within the middle cranial fossa, NOT within the cavernous sinus itself. The ganglion lies on the petrous part of the temporal bone, anterior to the petrous apex. **Clinical Pearl:** The trigeminal cave is bounded by dura mater and is clinically significant in meningeal infections and tumours affecting the middle cranial fossa. ### Correct Statements Reviewed | Feature | Details | |---------|----------| | **V1 (Ophthalmic)** | Exits via superior orbital fissure; purely sensory | | **V2 (Maxillary)** | Exits via foramen rotundum; carries preganglionic parasympathetic fibers to pterygopalatine ganglion (via greater petrosal nerve) | | **V3 (Mandibular)** | Exits via foramen ovale; **only trigeminal division with motor component** (innervates muscles of mastication, mylohyoid, anterior belly of digastric, tensor veli palatini, tensor tympani) | | **Ganglion Location** | Meckel's cave (dural recess in middle cranial fossa), NOT cavernous sinus | **High-Yield:** The distinction between the location of the trigeminal ganglion (Meckel's cave) and the cavernous sinus is frequently tested. The cavernous sinus lies lateral to the sella turcica and contains CN III, IV, V1, V2, and VI, but the ganglion itself is not within the sinus. ### Why Option 3 is Correct The trigeminal ganglion resides in Meckel's cave, a dural recess in the middle cranial fossa on the petrous temporal bone. It is NOT located within the cavernous sinus, although the divisions of CN V pass through or near the cavernous sinus after leaving the ganglion.
Sign up free to access AI-powered MCQ practice with detailed explanations and adaptive learning.