Flashcards in OINAs Deck (378)
Over the pectoralis major and deltoid muscles
It tenses the skin of the
Origin of the zygomaticus major
The zygomatic arch
Insertion of the zygomaticus major
Into the corner of the mouth.
Action of the zygomaticus major
It pulls the angle of the mouth superiorly and posteriorly as in laughing.
Origin of the zygomaticus minor
The zygomatic bone and continues with orbicularis oculi on the lateral face of the levator labii superioris
Insertion of the zygomaticus minor
Into the outer part of the upper lip.
Action of the zygomaticus minor
It draws the upper lip backward, upward and outward as in smiling
Origin of extraocular rectus muscles
A common tendinous ring that surrounds the optic canal and superior orbital fissure
Insertion of extraocular rectus muscles
The anterior portion of the sclera.
Innervation of extraocular rectus muscles
(i) I –CN III
(i) I – CN VI
Origin of superior oblique
The sphenoid bone passes through the trochlea (cartilaginous sling)
Insertion of superior oblique
The posterior lateral aspect of the sclera
Innervation of superior oblique
Origin of inferior oblique
The anteromedial aspect of the floor of the orbit
Insertion of inferior oblique
The posterolateral aspect of the sclera
Innervation of inferior oblique
All facial muscles are innervated by the ____
All facial muscles are innervated by the Facial nerve
Action of Orbicularis oris
Encircles the mouth, causes mouth closure, pursing or puckering of lips,
chewing and speaking.
Action of the buccinator
Located in the cheek and is important for mastication. It maintains the skin against the teeth during chewing. It aids with whistling and sucking.
Origin of platysma
The skin of the face and mandible and descends
into the superficial fascia of the neck
Insertion of platysma
The pectoralis major and deltoid muscles
Action of platysma
Tenses the skin of the neck.
Origin of temporalis muscle
Floor of the temporal fossa
Insertion of temporalis muscle
Coronoid process of the
Innervation of temporalis muscle
Mandibular nerve, V3
Action of temporalis muscle
Elevation and retraction of the mandible for mastication
Origin of masseter muscle
Insertion of masseter muscle
Lateral surface of the ramus, coronoid process and angle of the mandible