Muscles of Face & Jaw

Layers of Scalp

1. Skin

2. Dense CT

3. Aponeurosis (tendinous sheet)

4. Loose Areolar CT

5. Pericranium 

Orbicularis Oculi

Orbital and palpebral parts surrounding the eye

Orbital Part

Forceful closure

Palpebral Part

Blinking

Pterygomandibular Raphe

Spans between pterygoid hamalus & posterior end of mylohyoid line

Orbicularis Oris

Protrudes lips (kiss)

Mentalis

Protrudes lower lip (sad face)

Buccinator

Stiffens cheek

Levator Labii Superioris

Elevator of upper lip

Sensory Cutaneous

Branches of the trigeminal nerve 

Motor to Muscles of Facial Expressions

Branches of the facial nerve

Superior Head of Lateral Pterygoid

Infra-temporal surface of the greater wing of the sphenoid

Temporomandibular joint capsule and articular disc

Inferior head of Lateral Pterygoid

Lateral surface of lateral pterygoid plate

Pterygoid fovea on neck of mandible 

Lateral Pterygoid Function

Bilateral: Protracts and depresses mandible (open mouth)

Unilateral: Lateral swing of the mandible to the contralateral side