Muscles of facial expression and chewing

Question 1

Orbicularis Oculi Muscle

Answer 1

Origin - Frontal and maxillary bone around orbits
Insertion - Fibres of the upper and lower eyelid
Action - closing eyelid, squinting

Question 2

Orbicularis Oris Muscle

Answer 2

Origin - Maxilla and Mandible
Insertion - Inner Aspect of the skin
Action - Closes lips, whistling, pursing and protruding of the lips

Question 3

Buccinator Muscle

Answer 3

Origin - Maxilla and Mandible
Insertion - Fibres of the orbicularis oris
Action - Compresses cheek ie sucking Keeps food in
centre of mouth

Question 4

Masseter Muscle

Answer 4

Origin - Zygomatic arch and zygomatic bone
Insertion - Mandible
Action - Raise Lower Jaw

Question 5

Temporalis Muscle

Answer 5

Origin - Temporal Bone
Insertion - Mandible
Action - Move mandible up, back and side to side