Question 1

Which muscle is primarily responsible for elevating the mandible during chewing?

Accepted Answer

Masseter

Question 2

A patient presents with difficulty closing their mouth and chewing. Damage to which muscle is most likely responsible?

Accepted Answer

Masseter

Question 3

Which muscle is involved in turning the head to the opposite side and flexing the neck?

Accepted Answer

Sternocleidomastoid

Question 4

The orbicularis oris muscle is essential for which of the following actions?

Accepted Answer

Closing the lips

Question 5

Which muscle originates on the zygomatic bone and is involved in smiling?

Accepted Answer

Zygomaticus major

Question 6

If a person cannot raise their eyebrows, which muscle is most likely paralyzed?

Accepted Answer

Frontalis

Question 7

Which muscle is responsible for compressing the cheeks, as in blowing air or playing a wind instrument?

Accepted Answer

Buccinator

Question 8

A patient is unable to pucker their lips. Which muscle is most likely affected?

Accepted Answer

Orbicularis Oris

Question 9

Which muscle is located on the lateral side of the skull and assists in elevating and retracting the mandible?

Accepted Answer

Temporalis

Question 10

Which muscle is most involved in facial expressions such as frowning?

Accepted Answer

Platysma

Question 11

If the origin of a muscle is on the zygomatic bone and the insertion is at the corner of the mouth, what is the likely action of this muscle?

Accepted Answer

Elevates the corner of the mouth (smiling)

Question 12

Which muscle is most likely to be involved in whistling?

Accepted Answer

Orbicularis Oris

Question 13

A patient with Bell's palsy cannot close one eye. Which muscle is affected?

Accepted Answer

Orbicularis Oculi

Question 14

Which muscle is responsible for flexing the neck and rotating the head to the opposite side?

Accepted Answer

Sternocleidomastoid

Question 15

Which muscle is most likely to be used when a person is surprised and raises their eyebrows?

Accepted Answer

Frontalis

Question 16

Which muscle is involved in compressing the lips against the teeth?

Accepted Answer

Orbicularis Oris

Question 17

If a muscle's origin is on the sternum and clavicle and its insertion is on the mastoid process, what is its primary action?

Accepted Answer

Flexes the neck and rotates the head

Question 18

Which muscle is most likely to be activated when a person clenches their jaw tightly?

Accepted Answer

Masseter

Question 19

Which muscle is responsible for depressing the lower jaw and tensing the skin of the neck?

Accepted Answer

Platysma

Question 20

Which equation best represents the force generated by a muscle, given the cross-sectional area $$A$$ and the specific tension $$\sigma$$?

Accepted Answer

$$F = \sigma 	imes A$$

Study Notes: The Mystery of Muscle – Key Muscles of the Head and Neck

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