Muscle Test 3

sternocleidomastoid

O: manubrium of sternum and clavicle
I: mastoid process of temporal bone
A: flexes and rotates head

longissimus capitis

O: transverse processes of inferior cervical and superior thoracic vertebrae
I: mastoid process of temporal bone
A: extends and rotates head

semispinalis capitis

O: articulating processes of inferior cervical and transverse processes of superior thoracic vertebrae
I: between superior and inferior nuchal lines of occipital bone
A: extends head

splenius capitis

O: spinous processes of inferior cervical and superior thoracic vertebrae
I: occipital bone and mastoid process of temporal bone
A: extends and rotates head

omohyoid

O: superior border of scapula
I: Hyoid
A: depresses larynx and hyoid

sternohyoid

O: manubrium of sternum
I: Hyoid
A: depresses larynx and hyoid

stylohyoid

O: styloid process of temporal bone
I: hyoid
A: elevates larynx

geniohyoid

O: medial surface of mandible
I: Hyoid
A: elevates hyoid

mylohyoid

O: inferior border of mandible
I: hyoid
A: elevates hyoid and floor of mouth, depresses mandible

thyrohyoid

O:thyroid cartilage of larynx
I: hyoid
A: depresses hyoid and elevates thyroid cartilage

sternothyroid

O: manubrium of sternum
I: thyroid cartilage of larynx
A: depresses larynx

genioglossus

O: medial surface of mandible
I: body of tongue
A: depresses and protracts tongue

hyoglossus

O: body of hyoid
I: side of tongue
A: depresses and retracts tongue

masseter

O: zygomatic arch
I: lateral ramus of mandible
A: elevates mandible

temporalis

O: temporal fossa
I: coronoid process of mandible
A: elevates mandible

digastric: anterior belly

O: inferior border of mandible at chin
I: hyoid via intermediate tendon
A: elevates hyoid and depresses mandible

digastic: posterior belly

O: mastoid region of temporal bone
I: hyoid via intermediate tendon
A: elevates hyoid and depresses mandible

platysma

O: fascia of neck and chest
I: inferior border of mandible
A: depresses mandible

mentalis

O: mandible at chin
I: skin of chin
A: elevates and protrudes lower lip

orbicularis oris

O: maxilla and mandible
I: mucosa of lips
A: closes and purses lips

orbicularis oculi

O: bones of medial orbit
I: skin around eyelid
A: closes eye

zygomaticus major

O: zygomatic bone
I: angle of mouth
A: elevates corner of mouth

risorius

O: fascia of cheek
I: angle of mouth
A: draws corner of mouth laterally

buccinator

O: lateral aspects of maxilla and mandible
I: orbicularis oris
A: compresses cheek

epicranius occipitalis

O: occipital bone and mastoid process
I: epicranial aponeurosis
A: retracts scalp

epicranius frontalis

O: epicranial aponeurosis
I: skin of eyebrow
A: wrinkle forehead and elevates eyebrow