Mandibular nerve passes through –
**Core Concept**
The mandibular nerve is the third branch of the trigeminal nerve (cranial nerve V), which is responsible for transmitting sensory and motor information from the lower face and jaw. It is a mixed nerve, containing both sensory and motor fibers.
**Why the Correct Answer is Right**
The mandibular nerve passes through the foramen ovale, a small opening in the sphenoid bone located near the temporal bone. This is the main exit point of the mandibular nerve from the skull. The foramen ovale is situated below and posterior to the foramen rotundum, through which the maxillary nerve passes. The mandibular nerve then descends to innervate the lower face and jaw, including the muscles of mastication.
**Why Each Wrong Option is Incorrect**
**Option A:** The foramen magnum is the large opening at the base of the skull through which the spinal cord connects to the brain, but it is not related to the mandibular nerve.
**Option B:** The foramen spinosum transmits the middle meningeal artery and vein, but it is not associated with the mandibular nerve.
**Option C:** The foramen rotundum is the exit point of the maxillary nerve, not the mandibular nerve.
**Clinical Pearl / High-Yield Fact**
The foramen ovale is a key landmark in the skull base, and its location is important for neurosurgical procedures and the diagnosis of various conditions affecting the trigeminal nerve.
**Correct Answer: D. Foramen ovale.**