Muscles of Face & Neck (H & C) (lab exam 2)

Facial Expression;

Frontalis

O: galea aponeurotica

I: skin of eyebrows

A: raises eyebrows

Facial Expression;

Orbicularis Oculi

O: frontal bone & maxillary bone

I: eyelid

A: closes eye; squinting

Facial Expression;

Risorius

O: fascia of the cheek

I: corner of mouth

A: moves the corner of the mouth laterally

Facial Expression;

Zygomaticus (H)

O: zygomatic bone

I: corner of mouth

A: elevates corner of mouth (smiling)

Facial Expression;

Orbicularis Oris (H)

O/I: encircles mouth

A: closes lips; protrudes lips

Facial Expression;

Platysma

O: fascia of chest

I: lower margin of mandible

A: tenses skin of neck

Mastication;

Masseter

O: zygomatic arch

I: ramus of mandible

A: elevates mandible (close jaw)

Mastication;

Masseter (C)

O: zygomatic arch

I: ramus of mandible

A: elevates mandible (close jaw)

Mastication;

Temporalis

O: temporal & parietal bones

I: coronoid process of mandible

A: elevates mandible (close jaw)

Anterior Neck;

Digastric

O: mastoid process of temporal bone

I: mandible (via hyoid bone)

A: depress mandible (open jaw); elevates hyoid (during swallowing)

Anterior Neck;

Digastric (C)

O: mastoid process of temporal bone

I: mandible (via hyoid bone)

A: depress mandible (open jaw); elevates hyoid (during swallowing)

Anterior Neck;

Mylohyoid

O: mandible

I: hyoid bone; midline (where the two muscles meet)

A: elevates floor of mouth

Anterior Neck;

Mylohyoid (C)

O: mandible

I: hyoid bone; midline (where the two muscles meet)

A: elevates floor of mouth

Anterior Neck;

Sternohyoid (H)

O: manubrium of the sternum

I: hyoid bone

A: depress hyoid

Anterior Neck;

Sternohyoid (C)

O: manubrium of the sternum

I: hyoid bone

A: depress hyoid

Anterior Neck;

Sternocleidomastoid (H)

O: manubrium of sternum; clavicle

I: mastoid process of temporal bone

A: flex neck; rotate neck

Anterior Neck;

Sternocleidomastoid (C*)

O: manubrium of sternum; clavicle

I: mastoid process of temporal bone

A: flex neck; rotate neck