eRadiograph Volume 7: Imaging of Oral Cavity | Page 195

MASTICATOR SPACE MUSCLES
MUSCLE

ORIGIN

INSERTION

Masseter muscle

Zygomatic arch

Lateral surface of ramus,
angle, posterior body of
mandible

Temporalis muscle

Temporal fossa

Coronoid process of
mandible fossa

Lateral pterygoid muscle

Two heads-lateral
pterygoid plate and MS
surface of skull base.

Medial aspect of
mandibular condyle.

Medial pterygoid muscle

Fossabetween pterygoid
plates

Medial aspect of the
angle of the mandible.

CONTENT

PATHOLOGY

-Muscles of mastication

- Sarcomas
- Benign masseteric hypertrophy.
- Denervation atrophy
- Myositis ossificans
- Metastasis.
- Idiopathic fibrosis.

- Mandible

- Osteomyelitis
- Odontogenic abscess
- Primary jaw lesions
- Myeloma

- Inferior alveolar
and lingual nerve

- Neurogenic tumors
- Perineural spread of tumor

-Vascular

-Venous malformation, AVM,
lymphatic malformation

- Secondary involvement

- Deep spread of adjacent SCC.
- Inferior extension of intracranial
or skull base lesions

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Masticator Space

MASTICATOR SPACE LESIONS