Muscles of the mouth Flashcards
What is the mentalis muscle?
muscle innervated by the mandibular branch of the facial nerve; it wrinkles chin and elevates the lower lip
What is the depressor anguli oris?
muscle innervated by the mandibular and buccal branches of CN VII; draws corners of the mouth down and out
What is the risorius muscle?
muscle innervated by the zygomatic and buccal branches of CN VII; it controls smiling and grinning by retracting the corners of the mouth
What is the levator labii superioris alaquae nasi muscle?
dilator muscle innervated by the buccal branches of CN VII; elevates upper lip and flares nostrils
What is the levator labii superioris muscle?
dilator muscle innervated by the buccal branches of CN VII; elevates and everts (i.e., turn inside out) the upper lip
What is the depressor labii inferioris muscle?
dilator muscle innervated by the mandibular and buccal branches of CN VII; depresses the lower lip as if someone is pouting
What is the zygomatic major?
dilator muscle innervated by the zygomatic and buccal branches of CN VII; it pulls the corners of the mouth up and out as in smiling or laughing
What is the zygomatic minor?
dilator muscle innervated by the zygomatic and buccal branches of CN VII; it brings the upper lip up and deepens nasolabial fold
What is the levator angular oris?
dilator muscle innervated by the buccal branches of CN VII; it pulls corners of the lips up and out; deepens nasolabial fold as in smiling and laughing
What is the modiolus?
muscle found at the corners of the mouth; places where extrinsic lip muscles meet to intermingle with intrinsic orbicularis fibres. If it is damaged, then it interferes with cross-over at muscle fibers
What is the orbicularis oris?
muscle innervated by the buccal branches of the facial nerve; it closes and protrudes lips; puts lips together with making bilabial sounds; and presses lips against incisors
What is the platysema muscle?
lowers jaw, tenses skin of the neck, pulls lower lip down and back
What branches innervate the depressor labii inferioris and depressor angular oris?
mandibular branch and buccal branch
What branches innervate the risorius muscle, zygomatic major and zygomatic minor?
zygomatic branch and buccal branch
What branches innervate the levator labii superioris, levator labii superioris alaquae nasi, and levator anguli oris?
buccal branch
