As a group, the suprahyoid muscles perform what action?

Question

BlackTom AI · Accepted Answer

Let’s break down the function of the suprahyoid muscle group by evaluating each option in turn.
Option 1: 'depress the hyoid bone' — While some muscles can move the hyoid, the primary action of the suprahyoids as a group is not to depress the hyoid. In fact, many suprahyoid muscles elevate the hyoid during swallowing and speaking, so this statement misstates their common function.
Option 2: 'depress the mandible' — When the hyoid is fixed, the muscles of the suprahyoid group (such as the digastrics, mylohyoid, and geniohyoid) act to open the mouth by pulling the mandible downward and forward. This is a classic action described for these muscles as a group.
Option 3: 'rotate the hyoid bone' — The suprahyoid muscles are not known for rotating the hyoid bone as their primary action. Their movements are mostly vertical or anterior-posterior translations, not rotary rotation.
Option 4: 'protract the mandible' — Protrusion of the mandible is primarily accomplished by the muscles of mastication, especially the lateral pterygoid, not by the suprahyoid group. The suprahyoids can assist in jaw opening, not in advancing the mandible forward.
In summary, option 2 reflects the functional role of the suprahyoid muscles in conjunction with a fixed hyoid to depress the mandible, whereas the other statements either describe incorrect actions or misattribute the primary movements to these muscles.

ANATOMY 2300 AU2025 (34636) Unit 4 Exam - Requires Respondus LockDown Browser

As a group, the suprahyoid muscles perform what action?

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