unit 3 hw 6 extrinsic muscles of the larynx

In general, the suprahyoid muscles _______ the hyoid bone and thus, the larynx.

elevate

The _______ muscles originate at the oblique line of the thyroid cartilage and insert on the inferior border of the greater horn of the hyoid bone.

thyrohyoid

Because the omohyoid muscles have points of attachment inferior and posterior to the hyoid, contraction elevates/depresses and protrudes/retracts the hyoid bone. The omohyoids also provide upright stability for the ____.

depresses; retracts; neck

The sternothyroid muscles originate at the superior edge of the manubrium, laterally to the most medial edge of the clavicle and the chondral portion of the 1^st rib, and insert at the oblique line of the thyroid cartilage. Because the sternothyroids have a fixed point of attachment to the manubrium, they _______ the thyroid cartilage and thus, the larynx.

depress

The paired stylohyoid muscles are named for their points of attachment at the styloid process of the temporal bone and the lateral portions of the hyoid corpus. When these muscles contract, they _______ the hyoid bone, pull the hyoid bone ____, and _______ the base of the tongue.

elevate; back; elevate

The extrinsic muscles of the larynx are responsible for

(1) moving the larynx as a whole (2) elevating/depressing the larynx (3) articulatory movements of the tongue

The paired infrahyoid muscles are so named because they lie _____ the hyoid bone.

below

Muscles that depress the hyoid bone _______ the larynx.

depress

The paired suprahyoid muscles are so named because they lie _____ the hyoid bone.

above

1. If the hyoid bone is fixed in place, contraction of the ________ belly of the digastric muscle depresses the mandible and opens the oral cavity. If the mandible is fixed in place, contraction of both bellies elevates the _____ bone.

anterior; hyoid

four paired infrahyoid muscles

(1) sternothyroid m. (2) omohyoid m. (3) thyrohyoid m. (4) sternohyoid m.

Muscles that elevate the hyoid bone _______ the larynx.

elevate

four paired suprahyoid muscles

(1) geniohyoid m. (2) mylohyoid m. (3) stylohyoid m. (4) digastric m.

In general, the infrahyoid muscles _______ the hyoid bone and thus, the larynx.

depress

The most anterior of the infrahyoid muscles are the ___________ muscles. They are named for their points of attachment and originate at the manubrium laterally to the sternoclavicular joint and insert at the inferior body of the hyoid bone. Because they have a fixed attachment at the manubrium, contraction of these muscles _________ the hyoid bone.

sternohyoid; depresses

The geniohyoid muscle is named for its point of attachments and originates at the interior surface of the mandible (genio- “chin”) and inserts at the superior medial portion of the hyoid bone. If the hyoid bone is fixed in place, these muscles _______ and pull the mandible _______, thus opening the oral cavity. If the mandible is fixed in place, these muscles _______ and pull the hyoid bone _______.

depress; inward; depress; forward

Portions of the _______________________________ muscle insert on the thyroid and cricoid laminae and as a whole, this muscle is continuous with the esophagus. This muscle is not specific to phonation. However, it acts on the larynx as a whole and is responsible for ___________, the "wave-like" muscle movement that propels foods and liquids through the esophagus and to the stomach.

inferior pharyngeal constrictor; peristalsis

2 portions of digastric muscles

anterior belly and posterior belly

The infrahyoid muscles are also known as the _____ muscles because of their long flat appearance.

strap

2 portions of omohyoid muscles

superior belly and inferior belly

The _________ muscles are the fan-shaped muscles that help to form the floor of the oral cavity. They originate on the interior inferior surface of the ________ at the mylohyoid line and insert on the superior surface of the _____ corpus. 

mylohyoid; mandible; hyoid

Because it has a point of attachment below the hyoid, contraction of the thyrohyoid muscles _________ the hyoid bone. When the hyoid is fixed in place, this muscle _________ the larynx.

depresses; depresses