Temporomandibular Joints

Question 1

Temporalis

Answer 1

Origin: Temporal Fossa
Insertion: Coronoid process + the ramus of mandible
Actions: elevate mandible
Nerve: CN V

Question 2

Masseter

Answer 2

Origin: Inferior margins of zygomatic bone + zygomatic arch of temporal bone
Insertion: angle, ramus + coronoid process of mandible
Action: Elevate mandible
Nerve : CN V

Question 3

Lateral Pterygoid

Answer 3

Origin: Sphenoid bone
Insertion: neck of mandible + TMJ Capsule
Actions: Protracts mandible, contralaterally deviates mandible
Nerve: CN V

Question 4

Medial Pterygoid

Answer 4

Origin: Sphenoid Bone
Insertion: internal surface of angle of the mandible
Actions: Elevate, protract + contralaterally deviate the mandible
Nerve: CN V

Question 5

Occiptofrontalis ( epicranius)

Answer 5

Origin: Occipital bone + temporal bone
Insertion: fascia + skin overlaying frontal bone
Action: draws the scalp posteriorly (elevate eyebrows)
Nerve: CN VII

Question 6

Obicularis Oculi

Answer 6

Origin: encircles the eye ( from medial side + returns to medial side)
Actions: closes + squints the eyes
Nerve: CN VII

Question 7

Obicularis Oris

Answer 7

Origin: Entirely surrounds mouth
Actions: closes mouth, protracts lips
Nerve: CN VII

Question 8

Zygomaticus Major & Levator Anguli Oris

Answer 8

Origin: Zygomatic bone to the angle of the mouth/ Maxilla to the angle of the mouth
Actions: Elevates angle of the mouth

Question 9

Levator Labii Superious & Zygomaticus Minor

Answer 9

Origin: Maxilla to upper lip/ Zygomatic bone to upper lip
Action: Elevates upper lip

Question 10

Depressor Labii Inferioris

Answer 10

Origin: Mandible to the lower lip
Action: Depresses lower lip

Question 11

Platytsma

Answer 11

Origin: Subcutaneous fascia of superior chest to the mandible + subcutaneous fascia of lower face
Action: Draws up skin of superior chest + neck creating ridges of skin of the….