Label the indicated muscles of facial expression Levator labii superioris alaeque nasi Splenius capitus Depressor anguli oris Zygomaticus major Zygomaticus minor Levator labii superioris Zoom Reset
The Correct Answer and Explanation is:
Here is the correct labeling of the indicated muscles of facial expression in the image (from top to bottom, based on the lines pointing to the anatomical model):
- Splenius capitus – Top left (posterior side of the neck/head)
- Levator labii superioris alaeque nasi – Top right (next to the nose)
- Zygomaticus minor – Middle right (above the major, runs toward upper lip)
- Zygomaticus major – Middle left (angled toward corner of the mouth)
- Depressor anguli oris – Bottom right (angled downward from the mouth)
- Levator labii superioris – Bottom left (runs along the side of the nose toward the upper lip)
Explanation
Facial muscles are crucial for expression, playing roles in communication, emotion, and basic functions like eating and breathing. These muscles are unique in that they attach to the skin rather than just bone, allowing nuanced facial movements.
The levator labii superioris alaeque nasi is known as the “Elvis muscle” due to its role in raising the upper lip and flaring the nostrils—key in expressions of disgust or aggression. Positioned beside the nose, it’s one of the most medial upper lip elevators.
The splenius capitus, though not a facial muscle per se, is a neck muscle that extends and rotates the head. It connects the skull to the vertebrae and is important for head movement and posture.
The zygomaticus major and zygomaticus minor both arise from the zygomatic bone. The major draws the angle of the mouth upward and outward, crucial for smiling. The minor, lying superior to the major, elevates the upper lip—helping expose the upper teeth and contributing to expressions of disdain or joy.
The depressor anguli oris pulls the corners of the mouth downward, as seen in frowning or sadness. It is located on the lower part of the face and counterbalances muscles that elevate the mouth.
Finally, the levator labii superioris elevates the upper lip and is involved in showing the upper teeth and expressing contempt or surprise. It lies laterally to the nose and acts synergistically with other lip elevators.
Understanding these muscles is essential in medicine, dentistry, and cosmetic fields, as they play vital roles in nonverbal communication and facial aesthetics.
