The sternohyoid muscle and the thyrohyoid muscle are the atagonist of the suspension mechanism

A suspension mechanism is necessary when a muscle cannot extend by itself. It needs other muscles to support movements and extension.
For example, the suspension mechanism of the biceps is the triceps. The biceps contract and the triceps extend.
The larynx is suspended by the stylopharyngeus muscle. The muscles that support the suspension mechanism of the larynx are the digastric muscle, the genioglossus muscle, and the stylopharyngeus muscle. The stylohyoid muscle mostly contracts to assist in pulling up these muscles.
The stylohyoid ligament exists in the stylohyoid muscle. When the stylopharyngeus muscle and the stylohyoid muscle contract, the hyoid bone and the thyroid cartilage go up. Then, the sternohyoid muscle and the thyrohyoid muscle extend and pull the larynx down.
The stylopharyngeus muscle and the stylohyoid muscle is pulled by both sides which hardens the muscles when the suspension mechanism is working.
Furthermore, the larynx moves toward to cervical spine at this time.
Please be aware that this usually causes LDP. (Larynx Deep Position)

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