Oral Group

Question 1

Depressor anguli oris

Answer 1

Origin - oblique line of the mandible below canine, premolar and 1st molar teeth
Insertion - skin of corner of mouth blending in with orbicularis oris
Innervation - CNVII
Function - Draws corners of mouth down and laterally

Question 2

Depressor labii inferioris

Answer 2

Origin - Anterior part of oblique line of mandible
Insertion - Lower lip at midline, blends with muscle from other side
Innervation - CNVII
Function - Draws lower lip downward and laterally

Question 3

Mentalis

Answer 3

Origin - Mandible inferior to incisor teeth
Insertion - Skin of chin
Innervation - CNVII
Function - Raises and protrudes lower lip, as it wrinkles skin on chin

Question 4

Risorius

Answer 4

Origin - Fascia over masseter muscle
Insertion - Skin at corner of mouth
Innervation - CNVII
Function - Retracts corner of mouth

Question 5

Zygomaticus major

Answer 5

Origin - Posterior part of lateral surface of zygomatic bone
Insertion - skin at the corner of mouth
Innervation - CNVII
Function - Draws corner of mouth upward and laterally

Question 6

Zygomaticus minor

Answer 6

Origin - Anterior part of lateral surface of zygomatic bone
Insertion - Upper lip just medial to corner of the mouth
Innervation - CNVII
Function - Draws upper lip upward

Question 7

Levator labii superiors

Answer 7

Origin - Infra orbital margin of maxilla
Insertion - Skin of upper lateral half of lower lip
Innervation - CNVII
Function - Raises upper lip, naisolabial furrow

Question 8

Levator labii superioris alaeque nasi

Answer 8

Origin - Frontal process of maxilla
Insertion - Alar cartilage of nose and upper lip
Innervation - CNVII
Function - Raises upper lip and opens nostrils

Question 9

Levator anguli oris

Answer 9

Origin - Maxilla below infraorbital foramen
Insertion - skin at corner of mouth
Innervation - CNVII
Function - raises corners of mouth, helps with nasolabial furrow

Question 10

Orbicularis oris

Answer 10

Origin - Form muscles in the area; maxilla and mandible in midline
Insertion - forms elipse around mouth
Innervation - CNVII
Function - Closes lips; protrudes lips

Question 11

Buccinator

Answer 11

Origin - Posterior parts of maxilla and mandible
Insertion - Blends with orbicularis oris and into lips
Innervation - CNVII
Function - Presses cheeks against teeth; compresses distended cheeks