Question

matching question

match the head and jaw skeletal muscles with their actions.

instructions

masseter
digastric
platysma

closes the jaw
opens the mouth
pulls the corners of the mouth down

Explanation:

Match Masseter muscle action

The masseter is a powerful superficial muscle of mastication. Its primary action is to elevate the mandible, which Closes the jaw. This matches the Head and Jaw Muscles concept.

Match Digastric muscle action

The digastric muscle has two bellies. When it contracts, it depresses the mandible, which opens the mouth (or elevates the hyoid bone). This matches the Muscle Actions concept.

Match Platysma muscle action

The platysma is a broad sheet of muscle extending from the chest and shoulder up to the side of the neck and lower jaw. Its contraction tenses the skin of the neck and Pulls the corners of the mouth down (producing an expression of sadness or fright).

Answer:

Muscle	Action
Digastric	opens the mouth
Platysma	Pulls the corners of the mouth down