TG Ch 5

This strong muscle is located at the center of the cheek & tightens the corner of the lip as well as presses the cheek firmly against the teeth.

Buccinator

This muscle creates a look of surprise by eleveating the eyebrows

Frontalis fibers of the Occipitofrontalis

Which 3 muscles protract the mandible?

Lateral Pterygoid, Medial Pterygoid, & Masseter

If this muscle is mildly contracted unilaterally, it will produce an "Elvis-like" lip curl.

Levator Labii Superioris

Which 3 muscles elevate the mandible?

Maseter, Temporalis, & Medial Pterygoid

This is the most medial muscle of the chin; this muscle elevates the skin of the chin & protudes the lower lip (pout)

Mentalis

This sphincter muscle encircles the eye

Orbicularis Oculi

This strong sphincter muscle encircles the mouth

Orbicularis Oris

This muscle is a thin, superficial sheath spanning the neck from the fascia of the superior pectoralis major to the base of the mandible. It depresses the mandible but is often classified as a muscle of Facial Expression?

Platysma

This is the small triangular muscle located on the forehead that wrinkles the skin of the nose & draws the skin down between the eyebrows

Procerus

Although the name in Latin means "to laugh," this muscle retracts the corner of the mouth laterally and forms an insincere smile.

Risorius

What 4 muscles in the lateral compartment of the neck unilaterally rotate the neck to the opposite side?

SCM & all 3 scalene (anterior, middle, & posterior)

What 4 muscles (when used bilaterally) flex the neck?

SCM, anterior scalene, longus capitis, & longus colli

What muscle originates on the temporal fossa and fascia?

Temporalis

Which 2 muscles retract the mandible?

Temporalis & Digastric

What are the seven primary facial expression?

anger, contempt, disgust, fear, happiness, sadness, and surprise

Which muscles insert onto the first rib?

anterior and middle scalenes

if you palpate medial to the SCM at the level of the hyoid bone, you can feel the pulse originating from this structure of the neck

common carotid artery

Which muscle with two bellies originates at the mastoid process, loops through a tendinous sling at the hyoid bone and inserts onto the inferior border of the mandible?

digastric

What are the four suprahyoid muscles?

digastric, geniohyoid, mylohyoid, & stylohyoid

What forms the bridge between the frontalis and occipitalis muscle bellies to connect the Occipitofrontalis muscle?

galea aponeurotica

Where are the suprahyoid muscles located?

inferior to the mandible & superior to the hyoid bone in the anterior compartment of the neck

What two muscles of the anterior neck help unilaterally rotate the neck to the same side?

longus capitis & longus colli

What 6 muscles of the anterior & lateral compartments of the neck unilaterally move the cervical spine into lateral flexion on the same side?

longus capitis, longus colli, SCM & all 3 scalene (anterior, middle, & posterior)

Where does the masseter originate & insert?

originates at the zygomatic arch & inserts onto the angle and ramus of the mandible

Which scalene is difficult to distinguish from the surrounding muslce bellies?

posterior

Which muscle inserts onto the second rib?

posterior scalenes

These three muscles assist in respiratory inhalation

scalenes

What joint is the most frequently used in the body?

temporomandibular joint (moves 2-3K x per day)

Where do all of the scalenes originate?

transverse processes of various cervical vertebrae