Muscles of mastication Flashcards

1
Q

What are the muscles used for closing the mouth?

A

Temporalis, masseter, mylohyoides and pterygoide

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2
Q

What are the muscles for opening the mouth?

A

Digastricus muscle

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3
Q

What is the innervation for the muscles of opening the mouth?

A

Mandibular nerve

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4
Q

What is the innervation of the muscle that helps open the mouth?

A

Rostral part - mandibular nerve

Caudal part - facial nerve

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5
Q

What is the action of the temporalis muscle?

A

O: Lateral surface of skull and I: coronoid process of the mandible
Therefore contraction will raise the mandible
Bigger in carnivore for shearing

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6
Q

What is the action of the masseter muscle?

A

Masseter muscle sits lateral to the mandibe
O: maxillary region and zygomatic arch and I: caudal part of the mandible
Which when contracted will raise the mandible and draw it to the side of action (side to side)
Bigger in herbivores

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7
Q

What is the action of the pterygoide muscle?

A

Runs medial to the mandible (wont see on superficial prosection)
O: Pterygopalatine bone
I: Mandible
It raises the mandible and draws it inwards

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8
Q

What is the action of digastricus muscle?

A

Originates: caudal to temporal mandibular join
I: ventral margin of mandible
Opens the mandible (assisted by gravity)

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