Lateral Pterygoid muscle

Authors

Affiliations

Nathaniel Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

OIAN

Muscle	Origin	Insertion	Nerve	Action
Lateral Pterygoid	/The Archive/Anatomy/Skeletal Muscles/Head and Neck/Muscles of Mastication/lateral_pterygoid.html#origin	/The Archive/Anatomy/Skeletal Muscles/Head and Neck/Muscles of Mastication/lateral_pterygoid.html#insertion	?var:ref-lateral-pterygoid.nerve	/The Archive/Anatomy/Skeletal Muscles/Head and Neck/Muscles of Mastication/lateral_pterygoid.html#action

Origin

Superior Head: Greater wing of sphenoid bone (infratemporal crest); Inferior head: Lateral surface of pterygoid plate (lat surface)¹

Insertion

Superior Head: Tempormandibular joint (articular disc); Inferior head: Mandible (condylar process)¹

Innervation

Mandibular (V₃) divison of CN V via lateral pterygoid n.¹

Action

• BIL: Protrudes mandible (pulls articular disk forward)
• UNIL: C/L Lateral movements of mandible (chewing)¹

neummann explanation

“The lateral pterygoid muscle is generally described as a bipennate muscle with two distinct heads (see Fig. 11.19B).28,74,77,99 The superior head arises from the greater wing of the sphenoid bone (see Figs. 11.5 and 11.7). The considerably larger inferior head arises from the lateral surface of the lateral pterygoid plate and adjoining region of the maxilla. As a whole, the lateral pterygoid muscle traverses nearly horizontally to insert into a region of the neck of the mandible, very near the joint (review Fig. 11.10).4,27,28,77,99 Although the specific anatomic details are debated,14 the superior head of the lateral pterygoid shares attachments with the pterygoid fossa (see Fig. 11.2), the medial wall of the capsule, and the medial side of the”²

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 muscle²

References

1.

Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.

2.

Neumann DA, Kelly ER, Kiefer CL, Martens K, Grosz CM. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. 3rd ed. Elsevier; 2017.