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Front 1

MEDIAL PTERYGOID: OIAI

Back 1

D. Medial pterygoid

1. Origin: superficial head;maxillary tuber; deep head;medial surface of
the lateral pterygoid plate (the two heads embrace the anterior portion
ofthe inferior head ofthe lateral pterygoid)

2. Insertion: internal surface ofthe ramus and angle ofthe mandible

3. Action: elevation ofthe mandible

4. Innervation: nerve to the medial pterygoid, a branch of tlie mandibular
nerve

Front 2

II. Temporomandibular Joint

BONY COMPONENTS

Back 2

II. Temporomandibular Joint

A. Bony components include the condyle ofthe mandible and tlie inandibular
fossa and articular tubercle ofthe temporal bone; a fibrous capsule attaches
near the margins ofthe articular surfaces

Front 3

II. Temporomandibular Joint

Lateral temporomandibular ligament

Back 3

B. Ligaments

1. Lateral temporomandibular ligament: reinforces the lateral aspect ofthe
fibrous capsule between the articular tubercle and neck of tlie mandible

Front 4

II. Temporomandibular Joint

Sphenomandibular ligament

Back 4

Sphenomandibular ligament: fibrous band extending from tlie sphenoid
spine to the lingula ofthe mandible; it stands clear ofthe temporoman-
dibular joint

Front 5

II. Temporomandibular Joint

ARTICULAR DISC

Back 5

C. An articular disc attaches to the circumference of the fibrous capsule and
divides the joint into an upper and a lower synovial cavity; protraction and
retraction of the mandible occur in the upper synovial joint and depression
and elevation occur in the lower synovial joint

Front 6

MANDIBULAR NERVE

EMERGES FROM...

Back 6

III. Nerves

A. Mandibular nerve

1. Emerges from foramen ovale deep to the lateral pterygoid and immedi-
ately breaks up into the sensory and motor branches noted below (it is
the only division ofthe trigeminal nerve with motor branches)