Question 1

The insertion of a muscle is attached to the more movable structure.

Accepted Answer

The insertion of a muscle is the end attached to the more movable structure.The origin is generally considered to be the end attached to the least movable structure.

Question 2

Muscles of mastication are innervated by the facial nerve.

Accepted Answer

Muscles of mastication are innervated by the trigeminal nerve.

Question 3

The suprahyoid and thyrohyoid muscles control laryngeal movements.

Accepted Answer

The sternothyroid and thyrohyoid muscles control laryngeal movements.The suprahyoid is a group of muscles located above the hyoid bone and does not control laryngeal movements.

Question 4

All muscles of mastication are attached to an area of the mandible.

Accepted Answer

There are four pairs of muscles of mastication,which are all attached to the mandible.They are primarily responsible for elevating,protruding,retruding,or causing the mandible to move laterally.

Question 5

The sternocleidomastoid muscle has an origin at the superior border of the scapula.When muscle contracts it pulls the hyoid bone down.

Accepted Answer

The omohyoid has its origin at the upper border of the scapula (shoulder blade).Both the omohyoid and the sternocleidomastoid are members of the infrahyoid group.When contracted,both muscles pull the hyoid bone down.

Question 6

The sternocleidomastoid muscle is innervated by which cranial nerve?

Accepted Answer

The sternocleidomastoid muscle is innervated by the 11th cranial nerve.During an extraoral examination,this muscle should be palpated to check for enlarged lymph nodes lying against the internal jugular vein in the neck.

Question 7

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.

Accepted Answer

Contraction of the left lateral pterygoid muscle will move the mandible to the right.While one lateral pterygoid is contracting,the opposite elevators of the mandible hold the other condyle in place.

Question 8

Which muscle of mastication fans out widely at its origin?

Accepted Answer

The temporal muscle,frequently called the temporalis muscle,has a very wide origin.Muscle fibers run in vertical,inclined,and horizontal directions.These fibers insert primarily on the medial side and the tip of the coronoid process.

Question 9

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

Accepted Answer

Spasms from muscles can be referred as pain to the TMJ.Muscles most frequently involved are the sternomastoid and the trapezius.Although the sternocleidomastoid (SCM)is a different muscle,it also is involved in referred pain.

Question 10

The suprahyoid muscles are innervated by cranial nerves.

Accepted Answer

The suprahyoid muscles can be innervated by cranial or cervical nerves.

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