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Buccal fatpad: anterior to masseter, above buccinator

Buccinator

o

Attach to lateral surfaces of alveolar processes of maxilla and mandible

o

Two nerves pierce muscle

o

Buccal branch of facial nerve

Runs lateral to masseter

Supplies buccinator with motor fibers

o

Buccal branch of trigeminal nerve

Runs medial to masseter

DOES NOT supply buccinator

Pierces muscle to send sensory fibers to buccal mucosa of vestibule of mouth

Also sends small branch to skin of cheek

Facial artery and vein

o

Artery crosses mandible at anterior border of masseter

Crosses to medial angle of eye

Successively crosses mandible, buccinator and maxilla

o

Vein lies posterior to artery

Muscles of mouth

o

Depressor anguli oris

Depresses corners of mouth

Aided by posterior fibers of platysma

o

Zygomaticus major

Descends from zygomatic bone to corner of mouth

Draws angle of mouth posteriorly and superiorly

o

Levator labii superioris

Descends from infraoribtal margin to upper lip

Elevates upper lip

Covers the infraorbital nerve

o

Obicularis oris

Important sphincter muscle of mouth

Circular arrangement

Puckering, whistling

Lower lip, external nose and external ear

Lower lip

o

Small labial glands: immediately deep to mucus membrane  of lower lip

o

Red line of lip: inferior labial artery

Branch of facial artery

o

Branches of mental nerve ascend lower lip

Mental nerve traverses mental foramen

Branch of inferior alveolar nerve

o

Inferior alveolar nerve: runs within substance of mandible

o

Dentist anasthesize mental nerve

External Nose

o

Held in shape by nasal cartilages (hyaline)

Adjacent to inferior borders of two nasal bones: lateral nasal cartilages

Lateral nasal cartilages = triangular expansions of large septal cartilage

Septal cartilage: extends b/w right and left nasal cavities

Skin of nose innervated: external nasal nerve (branch of V1)

External ear

o

Consists of auricle and external acoustic meatus (external ear canal)

o

Shape maintained by single piece of elastic cartilage; no cartilage in lobule

o

Cartilage of external ear continuous with cartilage of EAM

Eye and Eyelids

o

Medial palpebral ligament: fibrous band deep to medial commissure

o

Margins of eyelids

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