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Questions and Answers
Where is the origin of the temporalis muscle?
Where is the origin of the temporalis muscle?
- Coronoid process of the mandible
- Lower border & medial surface of zygomatic arch
- Temporal lines (correct)
- Bony floor of temporal fossa
What is the main action of the masseter muscle?
What is the main action of the masseter muscle?
- Protraction of the mandible
- Elevation and retraction of the mandible
- Depression of the mandible
- Elevates the mandible to close the teeth in mastication (correct)
What is the boundary of the temporal fossa?
What is the boundary of the temporal fossa?
- Foramen lacerum, carotid canal, jugular foramen, foramen spinosum
- Inferior orbital fissure, optic canal, superior orbital fissure, foramen rotundum
- Infraorbital foramen, mental foramen, inferior alveolar canal, incisive foramen
- Superior temporal line, frontal process of zygomatic bone, infratemporal crest, upper border of zygomatic arch (correct)
Which nerve supplies the temporalis muscle?
Which nerve supplies the temporalis muscle?
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Which muscle has a fan-shaped structure?
Which muscle has a fan-shaped structure?
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Study Notes
Muscles of Mastication
- The origin of the temporalis muscle is the temporal fossa.
- The main action of the masseter muscle is to elevate the mandible (close the jaw).
- The boundary of the temporal fossa is the temporal line and the infratemporal crest.
- The nerve that supplies the temporalis muscle is the deep temporal nerve, a branch of the mandibular division of the trigeminal nerve (V3).
- The muscle that has a fan-shaped structure is the temporalis muscle.
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