**Core Concept**
The muscles of facial expression are a group of muscles that control facial movements, and they are primarily innervated by the facial nerve (cranial nerve VII). However, there are some muscles that are not supplied by the facial nerve, which is a crucial distinction in the field of neurology and anatomy.

**Why the Correct Answer is Right**
The muscles of facial expression include the frontalis, orbicularis oculi, and orbicularis oris, among others. However, the platysma muscle, which is responsible for facial expressions such as tensing the skin of the neck and face, is actually innervated by the cervical branch of the vagus nerve (cranial nerve X), not the facial nerve. This is because the platysma muscle is derived from the cervical fascia, and its innervation is consistent with its embryological origin.

**Why Each Wrong Option is Incorrect**
**Option A:** The frontalis muscle is a muscle of facial expression that is indeed innervated by the facial nerve.
**Option B:** The orbicularis oculi muscle is also a muscle of facial expression that is innervated by the facial nerve.
**Option C:** The orbicularis oris muscle is another muscle of facial expression that is innervated by the facial nerve.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the platysma muscle is not a true muscle of facial expression in the sense that it is not innervated by the facial nerve. This can be a tricky distinction, but it's crucial for understanding the anatomy and innervation of the face.

**Correct Answer:** D. Platysma