Muscles of face

Question 1

What nerve are the muscles of mastication innervated by

Answer 1

Trigeminal - mandibular division

Question 2

What nerve are the muscles of facial expression innervated by

Answer 2

Facial nerve

Question 3

What arch is the facial nerve originated from

Answer 3

2nd Pharyngeal arch

Question 4

What is the role of the orbicularis oculi

Answer 4

Palpebral - gentle close

Orbital- tightly close

Question 5

What is ectropion

Answer 5

Dry eye

Question 6

What muscle opens the oral cavity

Answer 6

Orbicular oris

Question 7

What muscle pulls the cheek towards the teeth to prevent food accumulation

Answer 7

Buccinator

Question 8

What is the role of zygomaticus major

Answer 8

Draws the angle of the mouth superiorly and posteriorly to allow one to smile.

Question 9

What is the role of zygomaticus minor

Answer 9

It draws the upper lip backward, upward, and outward and is used in smiling.

Question 10

Boundaries of anterior triangle

Answer 10

Sagittal midline
Anterior SCM
Inferior mandibular border

Question 11

Boundaries of posterior triangle

Answer 11

Posterior SCM
Middle 1/3 clavicle
Anterior of trap

Question 12

Boundaries of carotid triangle

Answer 12

Posterior belly digastric
Superior omohyoid
Medial border SCM

Question 13

What does the anterior border contain

Answer 13

Nerves, arteries, veins, lymph, supra and infra hyoid muscles, common carotid, internal jugular and CN 7,9,11,12

Question 14

What does the posterior border contain

Answer 14

Omohyoid, external jugular, accessory nerve, trunks of brachial plexus

Question 15

What does the carotid border contain

Answer 15

Bifurcation of common carotid, internal jugular, hypoglossal, vagus nerve

Question 16

What is the significance of retropharyngeal space

Answer 16

Between bucco pharyngeal and pre-vertebral and extends from base of skull to mediastinum and hence infection can spread