Muscles of the Head Flashcards
(21 cards)
What is the temporalis?
Temporalis is a muscle of the cranium, named after the temporal bone, which is its origin.
Where does the temporalis insert?
Temporalis inserts onto the coronoid process of the mandible.
Where does the temporalis originate?
Temporalis originates on the temporal fossa, the shallow depression on the temporal bone on the lateral side of the cranium.
What is the action of the temporalis?
Temporalis assists in elevating the mandible and performing mastication, along with masseter.
What innervates the temporalis?
Temporalis is innervated by the mandibular branch of the trigeminal nerve (cranial nerve V).
What is the origin of the temporalis?
The origin of the temporalis is the temporal fossa.
What actions does the temporalis perform?
The temporalis performs mandible elevation and retraction.
What is the insertion point of the temporalis?
The insertion point of the temporalis is the coronoid process of the mandible.
What is the Buccinator?
The Buccinator is a muscle of the face located in the area of the cheek, also known as the ‘buccal’ region.
What are the origin and insertion points of the Buccinator?
The Buccinator originates on the alveolar processes of the mandible and maxilla, and inserts onto the angle of the mouth, known as the modiolus, and the orbicularis oris muscle.
What is the primary function of the Buccinator?
The Buccinator primarily assists in mastication by squeezing the cheeks closer together while the jaw is depressed, forcing food back towards the teeth.
What additional functions does the Buccinator serve?
The Buccinator is also used for whistling and assists in smiling.
How is the Buccinator innervated?
The Buccinator is innervated by the buccal branch of the facial nerve (cranial nerve VII).
What happens to the Buccinator in Bell’s Palsy?
If a person is affected by Bell’s Palsy, the Buccinator becomes paralyzed, which produces slurred speech!
What is the action of the Buccinator?
The action of the Buccinator includes smiling and aiding in the elevation of the mandible.
What is the origin of the Masseter muscle?
The Masseter originates on the zygomatic arch and maxilla.
Where does the Masseter muscle insert?
The Masseter inserts onto the coronoid process and ramus of the mandible.
What is the primary function of the Masseter muscle?
When the Masseter contracts, it elevates the mandible and allows chewing to take place.
Which nerve innervates the Masseter muscle?
The Masseter is innervated by the mandibular branch of the trigeminal nerve (cranial nerve V).
What is a unique fact about the Masseter muscle?
The Masseter is the strongest muscle in the body by proportional size!
What movements does the Masseter muscle facilitate?
The Masseter facilitates mandible elevation and protraction.
