Exam 28: Muscles of Mastication, Hyoid Muscles, and Sternocleidomastoid and Trapezius Muscles

Spasms originating from the TMJ can be referred (as pain)to the sternocleidomastoid muscle (SCM).

During an extraoral examination,it is necessary to palpate beneath the sternothyroid muscle because enlarged lymph nodes may be lying against the internal jugular vein in the neck.

The suprahyoid and thyrohyoid muscles control laryngeal movements.

If the left lateral pterygoid contracts,the mandible will move to the left because one of the lateral pterygoid muscles acting by itself accomplishes lateral excursion.

Contraction of only the posterior portion of the temporalis muscle retrudes the mandible because this action also depresses the mandible.

Which muscle of mastication does not have two origins?

Muscles of mastication are innervated by the facial nerve.

The mandible is elevated by each of the following EXCEPT one.Which one is the EXCEPTION?

Hyoid muscles have a role in depressing the mandible.This includes the suprahyoid and the thyrohyoid muscles.

Innervation to the digastric muscle is unusual because it has two nerves supplying it.