Lateral Pterygoid muscle
Origin
Superior Head: Greater wing of sphenoid bone (infratemporal crest); Inferior head: Lateral surface of pterygoid plate (lat surface)3
Insertion
Superior Head: Tempormandibular joint (articular disc); Inferior head: Mandible (condylar process)3
Innervation
Action
- BIL: Protrudes mandible (pulls articular disk forward)
- UNIL: C/L Lateral movements of mandible (chewing)3
Palpation
- Intraoral: debatable (Turp 2001)
- posterior up towards the mandibular neck
- cranial directed pressure underneath zygomatic arch (have subject protrude)
- Ask them to protrude w/ palpation
Clinical Significance
Practically functions to stabilize the articular disc of the TMJ
Tears or excessive elongation of the lateral ligament may cause the disc to migrate medially by an unopposed pull of the superior head of the lateral pterygoid muscle4
Strain-Counterstrain
References
1.
Donnelly JM, Simons DG, eds. Travell, Simons & Simons’ Myofascial Pain and Dysfunction: The Trigger Point Manual. Third edition. Wolters Kluwer Health; 2019.
2.
Finando D, Finando SJ, Finando D. Trigger Point Therapy for Myofascial Pain: The Practice of Informed Touch. Healing Arts Press; 2005.
3.
Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.
4.
Neumann DA, Kelly ER, Kiefer CL, Martens K, Grosz CM. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. 3rd ed. Elsevier; 2017.
5.
Myers HL, Devine WH, Fossum C, et al. Compendium Edition: Clinical Application of Counterstrain. Compendium ed. Osteopathic Press; 2012.
Citation
For attribution, please cite this work as:
Yomogida N, Kerstein C. Lateral Pterygoid
muscle. https://yomokerst.com/The
Archive/Anatomy/Skeletal Muscles/Head and Neck/Muscles of
Mastication/lateral_pterygoid.html