What is the function of the palpebral part of the orbicularis oculi muscle?
It arises from the nasal part of the frontal bone, from the frontal process of the maxilla in front of the lacrimal groove, and from the anterior surface and borders of a short fibrous band, the medial palpebral ligament….
|Orbicularis oculi muscle|
|Antagonist||levator palpebrae superioris|
What action does the orbicularis oculi perform?
The orbicularis oculi muscle closes the eyelids and assists in pumping the tears from the eye into the nasolacrimal duct system. The orbital section of the orbicularis oculi is more involved in the voluntary closure of the eyelid, such as with winking and forced squeezing.
Which muscle is responsible for closing the eye?
The orbicularis oculi muscles circle the eyes and are located just under the skin. Parts of this muscle act to open and close the eyelids and are important muscles in facial expression.
Which part of the orbicularis oculi is known as Horner’s muscle?
Horner’s muscle (the palpebral part of the orbicularis oculi muscle) has a fan-shaped origin in the lacrimal bone. Its muscle fibers are oriented from 160 to 210 degrees relative to the ear-eye plane and converge towards the medial palpebral commissure.
What is the action of the orbicularis oculi and orbicularis oris?
|Origin||Nasal part of frontal bone, frontal process of maxilla, medial palpebral ligament, lacrimal bone|
|Actions||Orbital part: Closes eyelids tightly Palpebral part: Closes eyelids gently Deep palpebral part: Compresses lacrimal sac|
|Innervation||Temporal and zygomatic branches of facial nerve (CN VII)|
What is the action of the orbicularis oris?
Just like the other muscles of the buccolabial group, the function of orbicularis oris is to control the shape and movements of the lips. It closes, protrudes and compresses the lips….Orbicularis oris muscle.
|Origin||Medial aspects of maxilla and mandible, perioral skin and muscles, modiolus|
|Action||Closes mouth, compresses and protrudes lips|
What is the term Orbicularis in reference to quizlet?
Nasalis. Covers the bridge of the nose. Orbicularis oris. encircles the mouth.
What is the basic function of the orbicularis oris?
Orbicularis oris muscle along with the buccinator and pharyngeal constrictor form a functional unit, known as “buccinator mechanism” which has an important role in orofacial function (swallowing, sucking, whistling, chewing, vowel pronunciation, kissing).
What is the action of the orbicularis oculi quizlet?
Activity associated with that of orbicularis oculi. Origin: arch of frontal bone above nasal bone. Insertion: skin of eyebrow. Action: draws eyebrow medially, inferiorly, wrinkles skin of forehead vertically.
What’s the action of the orbicularis oris?
What is the term Orbicularis in reference to?
Medical Definition of orbicularis : a muscle encircling an orifice.
What is orbicularis oculi muscle?
Orbicularis oculi muscle (musculus orbicularis oculi) Orbicularis oculi is a paired facial muscle that surrounds each orbit and the adjacent periorbital region. Together with corrugator supercilii and levator palpebrae superioris, it belongs to the circumorbital and palpebral group of muscles that surround the eye.
What muscles are involved in closing the eyelid involuntary?
This is achieved through the three parts of orbicularis oculi muscle. Palpebral muscle helps in closing the eyelid involuntary especially when a person is sleeping. This muscle works together with the check, forehead skin and temple to shut the eyelids.
Where is the orbitalis oculi located?
Orbicularis oculi is located in the orbital region of the face. It surrounds the orbit and extends into nearby regions of the head; eyelids, eyebrows, temporal and infraorbital regions. The muscle overlies corrugator supercilii and it blends inferiorly with the highly variable malaris muscle, when present.
What happens when the palpebral part of the eye closes?
Contraction of the palpebral part results in finer control of the eyelids. These muscle fibers pull the upper eyelids down and raise the lower ones. Thereby, isolated voluntary contraction of the palpebral part gently closes the eyelids, for example when blinking or sleeping.