Identify the indicated muscle.

Question

BlackTom AI · Accepted Answer

Question: Identify the indicated muscle.

Option 1: platysma. This superficial neck muscle tansverses from the chest and shoulder up toward the lower jaw and corners of the mouth. It primarily helps tense the skin of the neck and lower face, but it is not the muscle located at the lower lip area shown in the image.

Option 2: orbicularis oris. This circular muscle surrounds the mouth and functions to purse and close the lips. While it is a key lip muscle, the image’s indicated deep, vertical slips are not characteristic of the orbicularis oris.

Option 3: depressor labii inferioris. This small muscle lies along the lower lip, running from the mandible to the lower lip, and its action is to depress the lower lip. The visual arrow in the image points to the region consistent with this muscle’s position and function, making it a good match for the indicated landmark.

Option 4: levator labii superioris. This muscle elevates the upper lip, contributing to expressions like a sneer or disdain. Its location is above the mouth on the face, not along the lower lip, so it does not correspond to the indicated site.

Option 5: zygomaticus. The zygomaticus major and minor pull the corner of the mouth upward and laterally, producing a smile. These muscles are situated at the upper cheek area, not along the lower lip, and thus do not align with the indicated point.

In summary, the location and function described by the question align most closely with depressor labii inferioris, which lowers the lower lip. The other options either act on different parts of the lips (upper vs. lower), surround the mouth without specifically lowering the lower lip, or are located in regions that do not match the indicated mark.

Identify the indicated muscle.

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