lateral pterygoid muscle

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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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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
Medical Dictionary, © 2009 Farlex and Partners

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.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Stimulation of lateral pterygoid activity leading to increased condylar growth at its muscular attachment has been proposed as a mandibular growth controlling mechanism.5
Temporomandibular joint: relation of the retrodiskal zone to Meckel's cartilage and lateral pterygoid muscle.
CT scan revealed linear un-displaced fracture of right frontal bone extending up to the roof and right ethmoid sinus, anterior clinoid process and lateral pterygoid plate, fracture of medial and lateral wall of the right orbit, and fracture of right ramus of the mandible.
The hypothesis is that differences in the pain threshold are found among the different masticatory muscles involved in TMD when submitted to palpation, with the lowest threshold expected for the lateral pterygoid muscle.
Transitory paresis of the lateral pterygoid muscle during a posterior superior alveolar nerve block-a case report.
A common cause of chronic facial pain syndrome is trigeminal neuralgia, which can be alleviated by injecting the superficial branches of the nerve, such as the supraorbital, infraorbital, and mental nerves, and deep injection of the maxillary nerve in the pterygopalatine fossa and/or the mandibular nerve posterior to the lateral pterygoid plate [1].
CN V provides motor innervation to the muscles of mastication (medial and lateral pterygoid, masseter, and temporalis muscles), the mylohyoid, the anterior belly of the digastric, the tensor veli palatini, and the tensor tympani muscles.
The masticator space (MS) contains muscles of mastication (medial and lateral pterygoid, masseter, and temporalis), ramus of the mandible and the third division of the cranial nerve V (Figure 10A).
And these tumor volumes and T categories were often related to particular anatomic structures, such as the lateral pterygoid muscle (LPM) or brainstem (which is a dose-limited organ).
For jaw opening dystonia the lateral pterygoid muscle is injected with 45 units of BTXA, by an intraoral injection approach following the ramus of the mandible to locate the lateral pterygoid and injecting approximately 45 units on each side.
Four muscles of mastication move the mandible: masseter, temporal, medial, and lateral pterygoid muscles.
It is classically divided into three portions, based on the relationship with the lateral pterygoid muscle: the mandibular portion, the pterygoid portion, and the pterygopalatine portion which is the deepest part of the artery.

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