**Core Concept**
The foramen ovale is a small opening in the skull that transmits a vital structure, allowing for communication between the cranial cavity and the infratemporal fossa. This structure plays a crucial role in the innervation of the parotid gland and surrounding musculature.

**Why the Correct Answer is Right**
The structure transmitted via the foramen ovale is the mandibular nerve (V3), which is a branch of the trigeminal nerve. The mandibular nerve contains both sensory and motor fibers, providing sensory innervation to the lower face and motor innervation to the muscles of mastication, including the medial and lateral pterygoids, the tensor tympani, and the tensor veli palatini. The mandibular nerve also provides parasympathetic innervation to the parotid gland via the otic ganglion.

**Why Each Wrong Option is Incorrect**
**Option A:** The lesser petrosal nerve is not transmitted via the foramen ovale, but rather through the foramen ovale's lateral wall to reach the otic ganglion.
**Option B:** The middle meningeal artery is not transmitted via the foramen ovale, but rather through the foramen spinosum.

**Clinical Pearl / High-Yield Fact**
The mandibular nerve is often involved in lesions affecting the foramen ovale, such as tumors or fractures, leading to symptoms like numbness or weakness in the lower face.

**Correct Answer:** C. Mandibular nerve