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Lab 8 AOI's

Terms in this set (29)

Frontalis
A: Raises eyebrows
O: Galea aponeurotica
I: Skin of eyebrows and root of nose
Occipitalis
A: Fixes aponeurosis and pulls scalp posteriorly
O: Occipital and temporal bones
I: Galea aponeurotica
Temporalis
A: Closes jaw; elevates and retracts mandible
O: Temporal fossa
I: Coronoid process of mandible
Masseter
A: Prime mover of jaw closure; elevates mandible
O: Zygomatic arch and zygomatic bone
I: Angle and ramus of mandible
Zygomaticus
A: Raises lateral corners of mouth upward
O: Zygomatic bone
I: Skin and muscles at corner of mouth
Buccinator
A: Compresses cheek; draws corner of mouth laterally
O: Molar region of maxilla and mandible
I: Orbicularis oris
Platysma
A: Tenses skin of neck; depresses mandible
O: Fascia of chest
I: Lower margin of mandible; skin and muscles at corner of mouth
Orbicularis Oculi
A: Closes eye; produces blinking and squinting; draws eyebrows inferiorly
O: Frontal and maxillary bones; ligaments around orbit
I: Tissue of eyelid
Orbicularis Oris
A: Closes lips; purses and protrudes lips; kissing and whistling muscles
O: Maxilla and mandible
I: Skin and muscles at angles of mouth
Levator Labii Superioris
A: Opens lips; raises and furrows the upper lip
O: Zygomatic bone and infraorbital margin of maxilla
I: Skin and muscle of upper lip
Depressor Labii Inferioris
A: Draws lower lip inferiorly
O: Body of mandible lateral to its midline
I: Skin and muscle of lower lip
Sternocleidomastoid
A: Flexes and laterally rotates head; neck flexion
O: Manubrium of sternum; medial portion of clavicle
I: Mastoid process of temporal bone; superior nuchal line of occipital bone
Digastric
A: Opens mouth; depresses mandible; elevates hyoid bone and steadys it during swallowing and speech
O: Lower margin of mandible; mastoid process of temporal bone
I: Hyoid bone
Stylohyoid
A: Elevates and retracts hyoid during swallowing
O: Styloid process of temporal bone
I: Hyoid bone
Mylohyoid
A: Elevates hyoid bone and floor of mouth to exert pressure that forces food bolus into pharynx
O: Medial surface of mandible
I: Hyoid bone and median raphe
Geniohyoid
A: Pulls hyoid bone superiorly and anteriorly
O: Inner surface of mandibular symphysis
I: Hyoid bone
Sternohyoid
A: Depresses larynx and hyoid bone if mandible is fixed
O: Manubrium and medial end of clavicle
I: Lower margin of hyoid bone
Sternothyroid
A: Pulls larynx and hyoid bone inferiorly
O: Posterior surface of manubrium of sternum
I: Thyroid cartilage
Thyrohyoid
A: Depresses hyoid bone; elevates larynx if hyoid is fixed
O: Thyroid cartilage
I: Hyoid bone
Pharyngeal Constrictor Muscles
A: Constricts pharynx during swallowing propelling food bolus to esophagus
O: Attached anteriorly to mandible and medial pterygoid plate; hyoid bone
I: Posterior median raphe of pharynx
Medial Pterygoid
A: Acts with lateral pterygoid muscle to protrude mandible and promote side-to-side movements
O: Medial surface of lateral pterygoid plate of sphenoid bone; maxilla and palatine bone
I: Medial surface of mandible near its angle
Lateral Pterygoid
A: Provides forward sliding and side-to-side grinding movements of the lower teeth
O: Greater wing and lateral pterygoid plate of sphenoid bone
I: Condyle of mandible and temporomandibular joint
Genioglossus
A: Protracts and retracts tongue
O: Internal surface of mandibular near symphysis
I: Inferior aspect of the tongue; body of hyoid bone
Hyoglossus
A: Depresses tongue; draws its sides downward
O: Body and greater horn of hyoid bone
I: Inferolateral tongue
Styloglossus
A: Retracts and elevated tongue
O: Styloid process of temporal bone
I: Inferolateral tongue
Long Head Of Triceps Brachii
A: Forearm extension; stabilizes shoulder joint and assist in arm adduction
O: Infraglenoid tubercle of scapula
I: Common tendon into olcranon process of ulna
Lateral Head Of Triceps Brachii
A: Forearm extension; stabilizes shoulder joint and assist in arm adduction
O: Posterior shaft of humerus
I: Common tendon into olcranon process of ulna
Medial Head Of Triceps Brachii
A: Forearm extension; stabilizes shoulder joint and assist in arm adduction
O: Posterior humeral shaft distal to radial groove
I: Common tendon into olcranon process of ulna
Levator Scapulae
A: Elevates/adducts scapula
O: Transverse processes of C1-C4
I: Medial border of scapula, superior to the spine
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