PTERYGOID MUSCLES
\tˈɜːɹɪɡˌɔ͡ɪd mˈʌsə͡lz], \tˈɜːɹɪɡˌɔɪd mˈʌsəlz], \t_ˈɜː_ɹ_ɪ_ɡ_ˌɔɪ_d m_ˈʌ_s_əl_z]\
Definitions of PTERYGOID MUSCLES
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Two of the masticatory muscles: the internal, or medial, pterygoid muscle and external, or lateral, pterygoid muscle. Action of the former is closing the jaws and that of the latter is opening the jaws, protruding the mandible, and moving the mandible from side to side.
By DataStellar Co., Ltd
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Is a thick, short muscle, which arises, by short aponeuroses, from the outer surface of the external ala of the pterygoid process, and from the outer surface of the great ala of the sphenoid bone: and is inserted at the anterior part of the neck of the lower jaw-bone, and the corresponding part of the inter-articular fibro-cartilage. This muscle draws the condyle of the lower jaw and the inter-articular ligament forwards. It carries the chin forwards, and to the opposite side. If the two external pterygoids act together, the jaw is carried directly forwards. 2. The Pterygoideus internus seu major, Masse'ter intern'us, Latens in Ore, (F.) Grand Pterygo-maxillaire, Pterygo-anguli-maxillaire. Grand Pterygoidien ou Pterygo'idien interne. A thick, quadrilateral muscle, which is attached by short and very strong aponeuroses; above, to the pterygoid fossa, whence it proceeds downwards, backwards, and outwards, to be inserted into the inner surface of the ramus of the lower jaw, near its angle. This muscle raises the lower jaw, and carries it a little forwards. It also performs the grinding motion.
By Robley Dunglison
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