muscles of mastication are involved in chewing fooud. Thes oint (TMUl, which is

Question

muscles of mastication are involved in chewing fooud. Thes oint (TMUl, which is formed by the articulaion condylar process emporal bone Idenvtily the TMU on the skull TMU is a synovial joint. What type of senovial joint ia iw On an anatomical model, identity the four muscles masticaton, On a skull idenpy the origin and in ersion muncle Muscle Lateral pterygoid Onjgin Temporal bone Coronold Origin Lateral pterygoid nsertion: Medial surface of and angle Origin: Zygomatic anch On a skull, arrange a pipe cleaner along the path of each muscle of mastication by connecting its origin and insertion. Based on the observed path that each muscle takes, speculate on its action in the table below MAKING CONNECTIONS Bel's palsy is a viral infection that causes an inflammation of the facial nerve and temporary paralysis of muscles of facial expression. Speculate on what might occur if Bel's palsy affected the left facial nerve of an individual, but the right facial nerve functioned normally. Musde Action Temporalis Lateral pterygoid Medial

Explanation / Answer

1) Temporamandibular joint is a synovial joint of condylar variety. ( it's articulate surface involves two condyles fitting in to each other, this type of joint permits movement mainly in one plane around the transverse axis. ) 2) temporalis - elevates mandible, side to side grinding movement, , retraction of protruded mandible. Masseter- elevates mandible, superficial fibres cause protrusion ; lateral pterygoid - depress mandible, lateral and medial pterygoid protrude mandible, ; medial pterygoid - elevates mandible, right medial pterygoid with right lateral pterygoid turn the chin to the left side.   Bells palsy can have 2 types of lesions- infranuclear and supra nuclear, clinical feature depends on the type of lesion . In case of infra nuclear lesion of left facial nerve - paralysis of upper and lower half of facial muscles of left side . In case of supra nuclear lesion of left facial nerve - paralysis of only lower half of facial muscles on the right side of the face.

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