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Head Muscles
Attachments, Innervation, Action
13
Anatomy
Professional
09/06/2012

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Cards

Term
Platysma
Definition
-Mandible and skin of lower face
-Fascia of anterior shoulder
Inn: CN 7 (Facial)
Action: Draws skin of neck superiorly; Depression of corners of the mouth
Term
Orbicularis Oculi
Definition
-Palpebral part: medial palpebral ligament; Orbital part: frontal bone, maxilla, and medial palpebral ligament
-Lateral palpebral raphe; Fibers from an uninterrupted ellipse around orbit
Inn: CN 7 (Facial)
Action: Closes the eyelids
Term
Orbicularis Oris
Definition
-From muscles in area; maxilla and mandible in midline
-Forms ellipse around mouth
Inn: CN 7 (Facial)
Action: Closes lips; protrudes/puckers lips
Term
Buccinator
Definition
-Posterior parts of maxilla and mandible; pterygomandibular raphe
-Blends with orbicularis oris and into lips
Inn: CN 7 (Facial)
Action: presses the cheek against teeth; compresses distended cheeks (centers food in the mouth)
Term
Occipitofrontalis
Definition
-Frontal belly: skin of eyebrows; Occipital belly: superior nuchal line and mastoid process
-Into galea aponeurotica
Inn: CN 7 (Facial)
Action: Wrinkles forehead; raises eyebrows; draws scalp backwards
Term
Auricular muscles
Definition
-Temporal fascia
-Auricle
Inn: CN 7 (Facial)
Action: moves auricle. May be important in normal auricle development
Term
Masseter
Definition
-Zygomatic arch
-Lateral surface of ramus of mandible
Inn: CN V3- masseteric nerve
Action: elevation of mandible
Term
Medial Pterygoid
Definition
-Deep head: medial surface of lateral pterygoid plate of process; Superficial head: maxilla
-Medial surface of mandible near angle
Inn: CN V3- nerve to medial pterygoid
Action: elevation of mandible (when acting together); Side-to-side movements (when acting individually)
Term
Lateral pterygoid
Definition
-Upper head: roof of infratemporal fossa; Lower head: lateral surface of lateral pterygoid plate
-Capsule of TMJ and neck of mandible
Inn: CN V3- nerve to lateral pterygoid
Action: Protrusion of the mandible (when acting together); Side-to-side movements (when acting individually)
Term
Temporalis
Definition
-Temporal fossa
-Coronoid process of mandible
Inn: CN V3- deep temporal nerves
Action: Elevation and retraction of mandible
Term
Anterior Digastric
Definition
-Digastric fossa of mandible
-Body of hyoid via common tendon
Inn: CN V3- nerve to mylohyoid
Action: Depression of mandible and elevation of hyoid
Term
Posterior Digastric
Definition
-Mastoid notch of temporal bone
-Body of hyoid via common tendon
Inn: CN VII
Action: Depression of mandible and elevation of hyoid
Term
Mylohyoid
Definition
-Mylohyoid line on mandible
-Body of hyoid
Inn: CN V3- nerve to mylohyoid
Action: depresses mandible, support and elevate floor of mouth; elevation of hyoid
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