Muscles of Scalp and Face Flashcards
Origin of Occipitofrontalis - Front belly
Epicranial aponeurosis
Insertion of Occipitofrontalis - Front belly
Skin and subcutaneous tissue of eyebrows and forehead
Action of Occipitofrontalis - Front belly
Elevates eyebrows and wrinkles skin of forehead; protracts scalp (indicating surprise or curiosity)
Innervation of Occipitofrontalis - Front belly
Facial Nerve (CN VII), temporal branch of partoid pelxus
Origin of Occipitofrontalis - Occipital belly
Lateral two thirds of superior nuchal line
Insertion of Occipitofrontalis - Occipital belly
Epicranial aponeurosis
Action of Occipitofrontalis - Occipital belly
Retracts scalp; increasing effectiveness of frontal belly
Innervation of Occipitofrontalis - Occipital belly
Facial Nerve (CN VII), posterior auricular branch
Origin of Orbicularis Oculi (Orbital sphincter)
Medial orbital margin; medial palpebral ligament; lacrimal bone
Insertion of of Orbicularis Oculi (Orbital sphincter)
Skin around margin of orbit; superior and inferior tarsal plates
Action of of Orbicularis Oculi (Orbital sphincter)
Closes eyelids: palpebral part does so gently; orbital part tightly (winking)
Innervation of Orbicularis Oculi (Orbital sphincter)
Facial Nerve (CN VII), temporal and zygomatic branch of parotid plexus
Origin of Procerus plus transverse part of nasalis
Fascia aponeurosis covering nasal bone and lateral nasal cartilage
Insertion of Procerus plus transverse part of nasalis
Skin of inferior forehead, between eyebrows
Actions of Procerus plus transverse part of nasalis
Depresses medial end of eyebrow; wrinkles skin over dorsum of nose (conveying disdain or dislike)
Innervation of Procerus plus transverse part of nasalis
Facial Nerve (CN VII). buccal branch parotid plexus
Origin of Orbicularis Oris (Oral Sphincter)
Medial maxilla and mandible; deep surface of peri-oral skin; angle of mouth (modiolus)
Insertion of Orbicularis Oris (Oral Sphincter)
Mucous membrane of lips
Action of Orbicularis Oris (Oral Sphincter)
Tonus closes oral fissure; phasic contraction compresses and protrudes lips (kissing) or resists distension (when blowing)
Innervation of Orbicularis Oris (Oral Sphincter)
Facial Nerve (CN VII), buccal branch parotid plexus
Origin of Levator Labii Superioris
Infra-orbital margin (Maxilla)
Insertion of Levator Labii Superioris
Skin of upper lip
Action of of Levator Labii Superioris
Part of dilators of mouth; retract (elevate) and/or evert upper lip; deepen nasolabial sulcus (showing sadness)
Innervation of Levator Labii Superioris
Facial Nerve (CN VII), buccal branch of parotid plexus
Origin of Zygomaticus minor
Anterior aspect, zygomatic bone
Insertion of Zygomaticus minor
Skin of upper lip
Action of Zygomaticus minor
Part of dilators of mouth; retract (elevate) and/or evert upper lip; deepen nasolabial sulcus (showing sadness)
Innervation of zygomaticus minor
Facial Nerve (CN VII), buccal branch of parotid plexus
Origin of Buccinator
Mandible, alveolar processes of maxilla and mandible, pterygomandibular raphe
Insertion of of Buccinator
Angle of mouth (modiolus); orbicularis oris
Action of Buccinator
Presses cheek against molar teeth; works with tongue to keep food between occlusal surfaces and out of oral vestibule; resists distension (when blowing)
Innervation of Buccinator
Facial Nerve (CN VII), buccal branch of parotid plexus
Origin of Zygomaticus Major
Lateral aspect of zygomatic bone
Insertion of of Zygomaticus Major
Angle of mouth (modiolus)
Action of Zygomaticus Major
Part of dilators of mouth; elevate labial commissure-bilaterally to smile (happiness); unilaterally to sneer (disdain)
Innervation of Zygomaticus Major
Facial Nerve (CN VII), buccal branch of parotid plexus
Origin of Levator anguli oris
Infra-orbital maxilla (canine fossa)
Insertion of Levator anguli oris
Angle of mouth (modiolus)
Action of Levator anguli oris
Part of dilators of mouth; widens oral fissure, as when grinning or grimacing
Innervation of Levator anguli oris
Facial nerve (CN VII), buccal branch of parotid plexus
Origin of Risorius
Parotid fascia and buccal skin (highly vascularized)
Insertion of Risorius
Angle of mouth (modiolus)
Action of of Risorius
Part of dilators of mouth; depresses labial commisure bilaterally to frown (sadness)
Innervation of of Risorius
Facial nerve (CN VII), buccal branch of parotid plexus
Origin of Depressor anguli oris
Anterolateral base of mandible
Insertion of Depressor anguli oris
Angle of mouth (modiolus)
Action of Depressor anguli oris
Part of dilators of mouth; depresses labial commisure bilaterally to frown (sadness)
Innervation of Depressor anguli oris
Facial nerve (CN VII), marginal mandibular branch of parotid plexus