let's talk about muscles of facial expression and so here we have a profile of someone's face I don't know who it is so here's muscles of facial expression the reason why you can get such expressive looks on the face that you
see in the skin is that if we then start panning through the skin attached in the fat so actually attaching within the subcutaneous fat of the face and going from muscle to skin or skin the muscle with a few taching to bone what happens
if we start seeing that these muscles of facial expression are the ones that attach into the deep surface of the skin so when the muscles contract the skin moves to give such expressions hence the name muscles of facial expression now
we're going to cover not every muscle of facial expression but these ones that are listed on the left using this black and white illustration because these are ones will help you understand clinically testing of the facial muscle
first is the frontalis muscle receiving its name because it's right along the frontal bone and this muscle when it contracts wrinkles the forehead as you see with some angry chef's salad actors and some funny British comedians the
next is the orbicularis oculi muscle this is a sphincter muscle it's circular as you can see in the circular pattern of these muscles part on the orbit and part on the eyelid the function of this muscle is to close the eyes as in one winking or keeping your eyes shut that's the big Euler's oculi muscle next we have is the nasal as' muscle receiving
its name for its attachment uh right along where as being located right along the nasal bone and its function is to flare the nostrils as in that movement the zygomaticus muscles receives its name the zygomaticus major and minor
because they attach along that zygomatic bone and then insert on the corner of the mouth and this is the smiling muscle because it draws the corner of the mouth up as in a smiling movement next our bucks inator muscle the Bucks inator
muscle helps to tense the cheeks it's located right on the internal surface of the of your mouth and it receives its name the Bucks and muscle because it's the trumpeter muscle where the word bucha comes from and you can see tensing the cheek is in playing trumpet or when a baby nurse is sucking the tea the cheeks inward as if for nursing it also keeps the food underneath your teeth as his muscle contracts when you're chewing and it's
also expressive as in the oh no you didn't look okay that pouting look next is our bicular Oris muscle this is a circular muscle that surrounds the mouth and its function is to close the mouth or to pucker the lips isn't going in for a kiss or whistling or chewing to keep food in your mouth so it doesn't fall out the platysma muscle this muscle is going to help tense the skin of the neck and so tensing the skin of the neck is in shaving and this muscle is a very flat muscle we see here deep to the skin that we see surrounding the neck and all these muscles of facial expression
thatyou see here are derived from that second branchial arch which when they migrate during embryonic development form the most superficial layer of muscles that we have on the face.
