facial mucles Flashcards
Which cranial nerves innervate the facial muscles?
CN VII (7)
describe the corrugator supercilli? origin? insert?
moves the eyebrows medially and downward (worried about test; worried face)
origin: frontal bone
inserts: skin near eyebrows
describe the function of the frontalis?
elevates the eyebrow (deer jumps in front of car -> supprised raised eyebrows)
Describe the depressor supercilii? origin? insertion?
pulls the procerus inferior and lateral
origin: lacrimal bone
inserts: lateral side of procerus
Describe the procures muscle?
pulls the medial portion of the eyebrows inferiorly (pro wrestler gets angry; angry face)
origin: nasal bone
which muscle is responsible for closing the eyelids?
orbicularis oculli
what are the four sub-divided areas of the orbicularis oculli
- orbital (outer)
- palpebral (inner)
- pre-tarsal
- pre-septal
to move the eyelids fibers fuse from the _____ and ______?
medial and lateral palpebral ligaments
describe Horner’s muscle?
deep head of the pre-tarsal orbicularis
assists in moving tears through canaliculi
what are the medial side eyelid ligaments split into?
- anterior (maxillae, anterior to lacrimal crest)
- posterior (posterior lacrimal crest)
- superior (jones muscle)
describe the lateral side eyelid ligaments?
- assist in holding the lid margins close to the surface of the eyelid
- fibers from the pre tarsal portions of the orbicularis oculi insert anterior to the lateral palpebral ligament ; lateral palpebral ligament attaches to whitnall’s tubercle
Describe the muscle of Riolan?
part of the pre-tarsal portion of the orbicularis oculi ; ensures the lid wiper portion of the palpebral conjunctiva is held firmly against the surface of the eye
ectropion?
lower lid apart from surface of globe
entropion?
inversion of eyelid margin , puts eyelashes in contact with globe
