Anatomy Muscle

Origin, insertion, action

Orbicularis Oculi Origin (2)

Maxilla, frontal

Orbicularis Oculi Insertion

Upper and lower eyelids

Orbicularis Oculi Action

Closes eyelids, wink, blink

Orbicularis Oris Origin

Lips

Orbicularis Oris Insertion

Lips

Orbicularis Oris Action

Closes, protrudes, and shapes lips

Buccinator Origin (2)

Maxilla, Mandible

Buccinator Insertion

Angle of mouth

Buccinator Action

Compresses cheeks in blowing, sucking, eating

Frontalis Origin

Epicranial Aponeurosis

Frontalis Insertion

Skin of forehead

Frontalis Action

Raises eyebrows and wrinkles forehead

Occipitalis Origin (2)

Occipital, Temporal

Occipitalis Insertion

Epicranial Aponeurosis

Occipitalis Action

Draws scalp backward, help from frontalis

Platysma Origin

upper fascia of thorax

Platysma Insertion

Mandible and corner of mouth

Platysma Action

Depresses mandible and depresses angle of mouth

Levator Palpebrae Superioris Action

Raises upper eyelid

Mentalis Action

Protrudes lower lip

Risorius Action

Draws angle of mouth laterally

Zygomaticus Major Action

Elevates angle of mouth

Levator Labii Superioris Action

Elevates Upper Lip

Depressor labii inferioris Action

depresses lower lip

Corrugator (supercilii) Action

produces vertical wrinkles of the forehead

Depressor anguli oris action

draws down corner of mouth

Temporalis origin (3)

frontal, parietal, temporal

Temporalis insertion

mandible

temporalis action

elevates and retracts mandible

masseter origin (2)

maxilla, zygomatic arch

masseter insertion

mandible

masseter action

elevates mandible, protrudes mandible

medial pterygoid origin (3)

sphenoid, palatine, maxilla

medial pterygoing insertion

mandible

medical pterygoid action

elevates mandible, protrudes mandible, side to side grinding

lateral pterygoid origin

sphenoid

lateral pterygoid insertion

mandible

lateral pterygoid action

lowers and protrudes mandible, side to side grinding

styloglossus origin

temporal (styloid process)

styloglossus insertion

tongue (base)

styloglossus action

retracts and elevates tongue

hyoglossus origin

hyoid

hyoglossus insertion

tongue (base)

hyoglossus action

retracts and depresses tongue

genioglossus origin

mandible

genioglossus insertion (2)

tongue, hyoid

genioglossus action

protrudes and depresses tongue

superior rectus (eye) origin

sphenoid

superior rectus (eye) insertion

sclera

superior rectus (eye) action

rolls eyeball upward, superiorly and medially

inferior rectus (eye) origin

sphenoid

inferior rectus (eye) insertion

sclera

inferior rectus (eye) action

rolls eyeball downward, inferiorly and medially

medial rectus (eye) origin

sphenoid

medial rectus (eye) insertion

sclera

medial rectus (eye) action

rolls eyeball medially, both eyes converge on midline

lateral rectus (eye) origin

sphenoid

lateral rectus (eye) insertion

sclera

lateral rectus (eye) action

rolls eyeball laterally

Superior oblique (eye) origin

sphenoid

Superior oblique (eye) insertion

sclera

Superior oblique (eye) action

rotates eye inferiorly and laterally

inferior oblique (eye) origin

maxilla

inferior oblique (eye) insertion

sclera

inferior oblique (eye) action

rotates eye superiorly and laterally

sternocleidomastoid origin (2)

sternum, clavicle

sternocleidomastoid insertion

temporal (mastoid)

sternocleidomastoid action

flexes head and neck, rotates face to opposite side

stylohyoid origin

temporal

stylohyoid insertion

hyoid

stylohyoid action

raises hyoid

mylohyoid origin

mandible

mylohyoid insertion

hyoid

mylohyoid action

raises hyoid

geniohyoid origin

mandible

geniohyoid insertion

hyoid

geniohyoid action

draws hyoid and tongue anteriorly

thyrohyoid origin

thyroid cartilage

thyrohyoid insertion

hyoid

thyrohyoid action

draws hyoid inferiorly

sternohyoid origin (2)

sternum, clavicle

sternohyoid insertion

hyoid

sternohyoid action

draws hyoid inferiorly

omohyoid origin (2)

scapula, clavicle

omohyoid insertion

hyoid

omohyoid action

draws hyoid inferiorly

digastric origin (2)

mandible (ant belly) , temporal (post belly)

digastric insertion

by a tendon to hyoid

digastric action

raises hyoid, depresses mandible

sternothyroid origin

sternum

sternothryoid insertion

thyroid cartilage

sternothyroid action

draws thyroid cartilage (larynx) inferioly

Scalenes

elevate ribs 1 and 2 during inhalation, flex cervical spine

pectoralis major origin (4)

sternum, clavicle, cart. of ribs 1-7, apon. of ext. oblique

pectoralis major insertion

humerus

pectoralis major action

flexes, adducts, rotates arm medially

pectoralis minor action

stabilizes scapula for arm movements, elevates ribs

external intercostals origin

rib-superior

external intercostals insertion

rib-inferior

external intercostals action

elevates ribs during inhalation