lateral pterygoid muscle

(redirected from musculus pterygoideus externus)

lat·er·al pter·y·goid mus·cle

(lat'ĕr-ăl ter'i-goyd mŭs'ĕl) [TA]
Masticatory muscle of infratemporal fossa; origin, inferior head from lateral lamina of pterygoid process; superior head from infratemporal crest and adjacent greater wing of the sphenoid; insertion, into pterygoid fovea of mandible and articular disc and capsule of temporomandibular joint; action, protrudes lower jaw to enable opening of mouth; unilateral contraction deviates chin laterally, enabling grinding motion for chewing; nerve supply, nerve to lateral pterygoid from mandibular division of trigeminal.
Synonym(s): external pterygoid muscle, musculus pterygoideus externus, musculus pterygoideus lateralis.

lateral pterygoid muscle

One of the mastication muscles. Origin: greater wing of sphenoid bone, lateral pterygoid plate. Insertion: pterygoid fovea of condyle of mandible. Nerve: trigeminal (CN V). Action: opens mouth, protrudes mandible.
Synonym: external pterygoid muscle See: arm for illus.
See also: muscle

lat·er·al pter·y·goid mus·cle

(lat'ĕr-ăl ter'i-goyd mŭs'ĕl) [TA]
Masticatory muscle of infratemporal fossa; origin, inferior head from lateral lamina of pterygoid process; superior head from infratemporal crest and adjacent greater wing of the sphenoid; insertion, into pterygoid fovea of mandible and articular disc and capsule of temporomandibular joint; action, protrudes lower jaw to enable opening of mouth; unilateral contraction deviates chin laterally, enabling grinding motion for chewing; nerve supply, nerve to lateral pterygoid from mandibular division of trigeminal.
Synonym(s): external pterygoid muscle, musculus pterygoideus externus, musculus pterygoideus lateralis.
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