Head and Neck Anatomy Flash Cards (Unit 12)

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Best imaging for Bony Structures of TMJ?
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CT Scan

Which Muscles are involved in Excursion of Mandible?
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Ipsilateral masseter, temporalis; contralateral pterygoids (medial and lateral)

Which structure Divides disc space into superior and inferior compartments?
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Articular Disc (Meniscus)

TMJ receives only __________ innervation?
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Sensory

Which Muscles are involved in Protrusion of Mandible?
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Pterygoids (Medial and Lateral)

Which Muscles are involved in Opening of Mandible?
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Lateral pterygoids, suprahyoids and infrahyoids

What is the Action of Lateral pterygoid Muscle?
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Protrusion, Depression and Contralateral excursion of Mandible

Upper compartment of TMJ is involved in which kind of Motion?
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Translation

Nerve innervation of TMJ?
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Auriculotemporal nerve, Nerve to masseter and Posterior deep temporal nerve.

What is the Insertion of Lateral pterygoid Muscle?
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Superior: Articular capsule and disc. Inferior: Anterior condylar neck.

Lower compartment of TMJ is involved in which kind of Motion?
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Rotation

Name Accessory ligaments of TMJ?
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Sphenomandibular ligament and Stylomandibular ligament

Best imaging for Soft Tissue Structures of TMJ?
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MRI

What is the Action of Medial pterygoid Muscle?
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Elevation, Protrusion and Contralateral excursion of mandible

What is the Insertion of Medial pterygoid Muscle?
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Medial side of mandibular angle

What is the Origin of Lateral pterygoid Muscle?
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Superior: Greater wing of the sphenoid. Inferior: Lateral side of lateral pterygoid plate.

Which Muscles are involved in Closing of Mandible?
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Temporalis, masseter and medial pterygoids

Which Muscles are involved in Retrusion of Mandible?
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Temporalis and masseters (deep)

At the angle of mandible a Sling is formed by which two Muscles?
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The Masseter and Medial pterygoid muscles

Most common Direction of TMJ Disc Displacement?
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Anteromedially

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