Muscles of Facial Expression Flashcards
1
Q
What are the functions of the muscles of facial expression?
A
- emotional expression
- sphincters and dilators of facial orifices
2
Q
What are all muscles of facial expression innervated by?
A
- facial nerve (CN VII)
3
Q
What are the five groups/categories of muscles of facial expression?
A
- orbital (+ scalp)
- oral
- nasal
- auricular
- platysma
4
Q
Orbicularis Oculi
A
- orbital group of facial expression muscles
- palpebral part gently closes eyelid
- orbital part forcefully closes eye
5
Q
Occipitofrontalis
A
- frontal belly raises and wrinkles eyebrows
- occipital belly retracts the scalp
6
Q
What are the layers of the scalp?
A
- Skin
- Connective tissue (dense, richly vascularized)
- Aponeurosis and muscle (i.e. occipitofrontalis)
- Loose connective tissue
- Pericranium/periosteum
7
Q
Zygomaticus major
A
- draws corners of mouth superior and lateral
7
Q
What are the oral group muscles of facial expression?
A
- zygomaticus major
- depresspor anguli oris
- levator labii superioris
- orbicularis oris
- buccinator
- modiolus
8
Q
Depressor anguli oris
A
- draws corners of mouth inferior and lateral
9
Q
Levator labii superioris
A
- raises upper lip
10
Q
Orbicularis oris
A
- closes oral fissure
- protrudes lips
11
Q
Buccinator
A
- presses cheek against teeth
- resists distention of cheek
- works with tongue to position food on teeth
12
Q
Modiolus
A
- central tendinous connection of muscles at the corner of the mouth
13
Q
What pierces the buccinator?
A
- parotid duct
14
Q
What does the buccinator blend with?
A
- orbicularis oris and lips