Mr. Bell presents with the inability to move certain muscles on one side of his face. You ask him to make various facial expressions and find that on his right side he is unable to purse his lips, pull in his cheeks, elevate his upper lip, and smirk. What muscles is Mr. Bell unable to contract?

검증된 단계별 안내

Identify the muscles responsible for the facial expressions Mr. Bell is unable to perform.

For pursing lips, consider the orbicularis oris muscle.

For pulling in cheeks, consider the buccinator muscle.

For elevating the upper lip, consider the levator labii superioris muscle.

For smirking, consider the zygomaticus major muscle.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Facial Muscles

Facial muscles are a group of muscles that control facial expressions. They are primarily innervated by the facial nerve (cranial nerve VII) and include muscles such as the orbicularis oris, buccinator, and zygomaticus. Understanding these muscles is crucial for diagnosing conditions like Bell's palsy, where muscle control is impaired.

Cranial Nerve VII (Facial Nerve)

The facial nerve, or cranial nerve VII, is responsible for the motor control of the facial muscles. It also carries sensory information from the taste buds of the anterior two-thirds of the tongue. Damage to this nerve can lead to weakness or paralysis of facial muscles, as seen in Mr. Bell's case.

Bell's Palsy

Bell's palsy is a condition characterized by sudden, temporary weakness or paralysis of the muscles on one side of the face. It is often caused by inflammation of the facial nerve and can result in difficulty with facial expressions, as well as other symptoms like drooping of the mouth or eyelid. Recognizing the signs of Bell's palsy is essential for appropriate management and treatment.