Final answer:
The facial nerve (CNVII) is responsible for motor innervation of the superficial face and controls facial expressions. A commonly used mnemonic to remember cranial nerve functions is "Some Say Marry Money But My Brother Says Brains Beauty Matter More." Tests for facial nerve strength, such as eye closure against resistance, are part of a neurological examination.
Step-by-step explanation:
The motor innervation of the superficial face is primarily controlled by the facial nerve (CNVII), one of the cranial nerves responsible for motor and sensory functions. Students often use mnemonics to remember the functions of cranial nerves. A traditional mnemonic for cranial nerve function is "Some Say Marry Money But My Brother Says Brains Beauty Matter More," which can help to remember that the facial nerve has both motor functions, such as controlling the muscles of facial expression, and sensory functions.
A specific test for evaluating the strength of the facial nerve involves asking a patient to shut their eyes tightly while the examiner attempts to open them. Repeating this test ensures the consistency and strength of the muscle contractions. This is an important part of a neurological examination to assess facial nerve integrity.
It is also useful to understand that other cranial nerves, such as the trigeminal nerve (CNV) and the hypoglossal nerve (CNXII), play roles in the motor function of the face, contributing to sensations and other movements that are distinct from facial expressions.