**Core Concept**
The parotid gland is a major salivary gland located in the head and neck region, playing a crucial role in the production of saliva. Its anatomical position is essential for understanding its clinical significance and potential complications.

**Why the Correct Answer is Right**
The parotid gland is situated in the preauricular area, extending from the zygomatic arch to the angle of the mandible. It lies between the ramus of the mandible and the sternocleidomastoid muscle, which is a key landmark for its location. This position allows the parotid gland to drain saliva into the oral cavity through the parotid duct (Stensen's duct). The gland's proximity to the facial nerve, which runs through it, is also clinically relevant.

**Why Each Wrong Option is Incorrect**
**Option A:** The buccinator muscle is located in the cheek, and the parotid gland is not situated between the ramus of the mandible and this muscle.
**Option C:** The masseter muscle is a jaw muscle that is located more anteriorly and is not in close proximity to the parotid gland.
**Option D:** The medial pterygoid muscle is located deeper in the infratemporal fossa and is not a landmark for the parotid gland's location.

**Clinical Pearl / High-Yield Fact**
The parotid gland's location near the facial nerve makes it susceptible to damage during surgical procedures, such as parotidectomy. Understanding the gland's anatomy is crucial for minimizing complications and avoiding facial nerve injury.

**✓ Correct Answer: B. Between the ramus of the mandible and sternocleidomastoid.**