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facial exp.muscles
Muslces of Facial Expression
| Question | Answer |
|---|---|
| Where are skin muscles located? | Superficial fascia |
| How are the skin muscles separated | indistinctly from one another |
| What nerve are skin muscles innervated by | the facial nerve (CN VII) |
| What are the Muscles of the scalp (2) | Occipitofrontalis and temporoparietalis m. |
| Muscle that draws scalp posteriorly and raises eyebrows as in an expression of surprise | Occipitofrontalis |
| What is the galea aponeurotica of the occipitofrontalis | helmet-like aponeurosis joining the frontal and occipital bellies of this muscle |
| Collective name for occipitofrontalis and its galea aponeurotica, and the temporoparietalis m. | Muscle Epicranius |
| arises from fascia of temporalis m. above and anterior to the ear. inserts into the galea aponeurotica | Temporoparietalis muscle |
| It is variable in its development, acts in helping to keep the scalp tight | temporoparietalis muscle |
| What are the muscles of the ear (3) | Anterior Auricular muscle, Posterior Auricular muscle, Superior Auricular muscle |
| located superficial to the temporalis muscle, arise from fascia of the temporalis muscle and insert into pinna | Anterior Auricular muscle, Posterior Auricular muscle, Superior Auricular muscle |
| Action of the Anterior Auricular muscle | pulls pinna anteriorly |
| Action of the Posterior Auricular muscle | pulls pinna posteriorly |
| Action of the Superior Auricular muscle | pulls pinna superiorly |
| What are the muscles of the Eye (2) | Orbicularis Oculi, Corrugator Supercilii |
| What is the Orbicularis Oculi | a sphincter muscle consisting of 3 parts. The pars orbitalis, pars palpebralis, and the pars lacrimalis |
| Peripheral outer part surrounding orbit; closes the eye | Pars Orbitalis |
| Inner part of lids; closes eyelids | Pars Palpebralis |
| Lies deep to palpebral part in medial corner of eye, compresses lacrimal sac, draws lacrimal puncta medially | Pars Lacrimalis |
| Located deep to frontalis and orbicularis oculi | Corrugator Supercilii |
| Action of Corrugator Supercilii | Draws the eyebrows downward and medially as in frowning |
| What are the muscles of the nose? (3) | Procerus, Nasalis, Depressor Septi Nasi |
| Action of Procerus | Draws medial angle of eyebrows downward, and wrinkles skin on bridge of nose |
| What are the 2 parts to Nasalis | Pars Alaris, Pars Transversa |
| Action of pars alaris aka(dilator naris) | Widens nostril |
| Action of pars transversa aka (compressor naris) | depresses cartilage of nose and compresses the nostril |
| Action of Depressor Septi Nasi | constricts the nostril |
| What are the muscles of the mouth? (12) | Levator Labii Superioris, Levator Labii Superioris Alaeque Nasi, Zygomaticus Minor, Zygomaticus Major, Levator Anguli Oris, Risorius, Depressor Anguli Oris, Buccinator, Depressor Labii Inferioris, Mentalis, Orbicularis Oris, Platysma muscle |
| Muscles inserting on Upper Lip (3) | Levator Labii Superioris, Levator Labii Superioris Alaeque Nasi, Zygomaticus Minor |
| Inserts on upper lip, action is it raises the upper lip | Levator Labii Superioris |
| Inserts into upper lip and alar (wings) part of nose. Action is it raises upper lip and dilates naris (nostril) | Levator Labii Superioris Alaeque Nasi |
| Arises from zygomatic bone, action is it moves upper lip upward and outward | Zygomaticus Minor |
| Muscles Inserting on Corner of Mouth (5) | Zygomaticus Major, Levator Anguli Oris, Risorius, Depressor Anguli Oris, Buccinator |
| inserts on corner of mouth, arises from zygomatic bone, raises corner of mouth as in laughing | Zygomaticus Major "laughing muscle" |
| inserts on corner of mouth, action is it raises angle (corner) of the mouth as in disdain | Levator Anguli Oris |
| inserts on corner of mouth, draws corner of mouth laterally as in smiling | Risorius "smile (grin) muscle" |
| inserts on corner of mouth, action is it depresses angle (corner) of mouth | Depressor Anguli Oris aka (triangularis) |
| inserts on corner of mouth, action is compresses cheeks against teeth during mastication (chewing) and also during blowing. Located deep to Zygomaticus major and Risorius | Buccinator |
| Muscles Inserting on Lower Lip (2) | Depressor Labii Inferioris, Mentalis |
| inserts on lower lip, action is it depresses lower lip | Depressor Labii Inferioris |
| inserts on lower lip, action is it protrudes lower lip and wrinkles skin on chin | Mentalis |
| Muscles encircling Mouth | Orbicularis Oris, Platysma Muscle |
| a sphincter muscle consisting of 2 parts; the "kissing muscle"-purses(puckers) lips, thus closing them | Orbicularis Oris |
| What are the 2 parts to the Orbicularis Oris | pars marginalis, pars labialis |
| Peripheral part around lips. part of Orbicularis Oris | Pars Marginalis |
| Central part around lips. Part of Orbcularis Oris | Pars labialis |
| Thin flat paper-like muscle that encircles the mouth | Platysma Muscle |
| Origin, Insertion, and Action of Platysma Muscle | O: fascia of cervical I: lower mandible and skin around mouth A: retracts and depresses angle of mouth as in horror, producing wrinkles on skin of neck; also helps in depressing mandible |
Created by:
trevpeters
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