Muscle of facial expression medium

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Questions and Answers

Which of the following muscles is NOT involved in facial expression?

Zygomaticus major

Orbicularis oculi

Frontalis

Sternocleidomastoid (correct)

What is the primary nerve that innervates the muscles of facial expression?

Vagus nerve

Hypoglossal nerve

Facial nerve (correct)

Trigeminal nerve

Which branch of the facial nerve is NOT one of its five main branches?

Buccal

Zygomatic

Cervical

Maxillary (correct)

Which muscle is primarily responsible for closing the eyelids?

Orbicularis oculi Signup and view all the answers

The facial artery primarily supplies blood to which of the following?

The muscles of facial expression Signup and view all the answers

What role do facial muscles play in speech?

Modifying articulation Signup and view all the answers

Which structure do most facial muscles originate from?

Bone or fascia Signup and view all the answers

Which of the following is an emotion that facial muscles help to express?

Happiness Signup and view all the answers

In which subgroup of facial muscles would you find the orbicularis oris?

Mouth Signup and view all the answers

What is the primary action of the Compressor Naris muscle?

Closes the nostrils Signup and view all the answers

Which muscle pulls the ear slightly forward?

Anterior Auricular Signup and view all the answers

Which artery supplies blood to the muscles acting on the external ear?

Posterior auricular artery Signup and view all the answers

What is the nerve supply for both the Anterior Auricular and Superior Auricular muscles?

Facial nerve, temporal branch Signup and view all the answers

What common condition may affect the functionality of facial muscles?

Bell’s Palsy Signup and view all the answers

What is the main function of the Superior Auricular muscle?

Raises the ear Signup and view all the answers

What is the primary action of the Orbital muscle?

Closes the eye forcefully Signup and view all the answers

Which artery supplies blood to the Corrugator muscle?

Superficial temporal artery Signup and view all the answers

What is the primary action of the Orbicularis Oris muscle?

Closes and opens the mouth Signup and view all the answers

Where does the Procerus muscle insert?

Medial end of the eyebrows Signup and view all the answers

Which nerve branch supplies the Levator Labii Superioris muscle?

Zygomatic branch of the facial nerve Signup and view all the answers

What is the origin of the Dilator Naris muscle?

Nasal margin of the maxilla Signup and view all the answers

Which nerve supplies the Nasalis muscle?

Buccal branches of the facial nerve Signup and view all the answers

What is the origin of the Depressor Labii Inferioris muscle?

Oblique line of the mandible Signup and view all the answers

Which muscle is primarily responsible for elevating the corners of the mouth?

Zygomaticus Minor Signup and view all the answers

Which muscle is responsible for frowning by pulling the eyebrows medially?

Corrugator muscle Signup and view all the answers

Where does the Zygomaticus Major muscle insert?

Angle of the mouth Signup and view all the answers

What is the action of the Compressor Naris muscle?

Closes the nostrils Signup and view all the answers

What is the nerve supply for the Orbital muscle?

Zygomatic branch of the facial nerve Signup and view all the answers

Which arteries supply blood to the Levator Labii Superioris muscle?

Facial & maxillary arteries Signup and view all the answers

Which muscle action is associated with the Nasalis?

Flaring the nostrils Signup and view all the answers

What is the action of the Depressor Labii Inferioris muscle?

Depresses the lower lip Signup and view all the answers

Which facial muscle is innervated by both buccal and zygomatic branches of the facial nerve?

Zygomaticus Minor Signup and view all the answers

Which artery supplies blood to the Procerus muscle?

Facial artery Signup and view all the answers

What characteristic action is attributed to the Orbicularis Oris muscle?

Purses the lips Signup and view all the answers

What is the origin of the Zygomaticus Major muscle?

Zygomatic arch Signup and view all the answers

What is the primary action of the Levator Anguli Oris muscle?

Elevates the corner of the mouth Signup and view all the answers

Which nerve supplies the Buccinator muscle?

Facial nerve, buccal branch Signup and view all the answers

What is the blood supply for the Depressor Anguli Oris muscle?

Facial artery Signup and view all the answers

Where does the Mentalis muscle insert?

Skin covering the chin Signup and view all the answers

What is the action of the Orbicularis Oculi muscle?

Closes the eyelids Signup and view all the answers

From which location does the Platysma originate?

Clavicle and shoulder Signup and view all the answers

What is the primary action of the Risorius muscle?

Retracts the angle of the mouth Signup and view all the answers

Which artery supplies the Occipitofrontalis muscle?

Superficial temporal artery Signup and view all the answers

The Buccinator muscle is involved in which function?

Compressing the cheek against the molars Signup and view all the answers

What blends with the Orbicularis Oris at the corners of the mouth?

Buccinator Signup and view all the answers

Study Notes

Muscles of Facial Expression

Most facial muscles originate from bone or fascia and insert into the skin.
Facial muscles are innervated by the facial nerve and supplied by the facial artery.
Facial muscles are responsible for expressions and have multiple functions, including speech, mastication, and facial aesthetics.

Mouth

Orbicularis Oris

Circles the oral cavity in lip tissue.
Origin: Some bony attachment (anterior nasal spine and midline above the chin).
Insertion: Fibres interlace with muscles around the lips.
Action: Closes and opens the mouth, compresses the lips, and protrudes the lips.
Nerve Supply: Facial nerve, buccal branch.
Blood Supply: Facial, maxillary & superficial temporal arteries.

Levator Labii Superioris

Origin: Lower rim of orbit.
Insertion: Fibres of Orbicularis Oris at the upper lip.
Action: Elevates upper lip.
Nerve Supply: Facial nerve, zygomatic and buccal branches.
Blood Supply: Facial & maxillary arteries.

Depressor Labii Inferioris

Origin:Beneath the lowest portion of the oblique line of the mandible.
Insertion: Orbicularis Oris in the lower lip.
Action: Depresses lower lip.
Nerve Supply: Facial nerve, mandibular branch.
Blood Supply: Facial & maxillary arteries.

Zygomaticus Minor

Origin: Zygomatic arch.
Insertion: Orbicularis Oris.
Action: Elevates upper lip.
Nerve Supply: Facial nerve, buccal & zygomatic branches.
Blood Supply: Facial artery

Zygomaticus Major

Origin: Zygomatic arch.
Insertion: Travels downwards and medially to blend with Orbicularis Oris at the angle of the mouth.
Action: Elevates corners of the mouth (e.g. during laughter).
Nerve Supply: Facial nerve, buccal & zygomatic branches.
Blood Supply: Facial artery.

Levator Anguli Oris

Origin: Canine fossa of the Maxilla, below the infra-orbital foramen.
Insertion: The Orbicularis Oris at the corner of the mouth.
Action: Elevates the corner of the mouth.
Nerve Supply: Facial nerve, buccal & zygomatic branch.
Blood Supply: Facial & maxillary arteries.

Depressor Anguli Oris

Origin: Beneath the angle of the mandible.
Insertion: Converges into the angles of the mouth and blend with Orbicularis Oris.
Action: Depresses corner of the mouth.
Nerve Supply: Facial nerve, buccal & mandibular branches.
Blood Supply: Facial & maxillary arteries.

Mentalis

Origin: Anterior surface of the mandible (incisive fossa).
Insertion: Skin covering the chin.
Action: Puckers/pulls skin of the chin upwards, helps the Orbicularis Oris muscle in clearing food from the labial sulcus
Nerve Supply: Facial nerve, mandibular branch.
Blood Supply: Facial & maxillary arteries.

Buccinator

Origin: Pterygomandibular raphae and buccal alveolar bone (in maxillary and mandibular molars regions).
Insertion: Blend with the Orbicularis Oris at the corners of the mouth.
Action: Pulls the corner of the mouth back and compresses the cheek against the buccal surfaces of molars. Aids in mastication by working in opposition to the tongue to direct food to the occlusal tooth surfaces.
Nerve Supply: Facial nerve, buccal branch.
Blood Supply: Facial & maxillary arteries.

Risorius

Origin: Angle of the mandible.
Insertion: Corner of the mouth.
Action: Retracts the angle of the mouth, assists in smiling.
Nerve Supply: Facial nerve, buccal branch.
Blood Supply: Facial artery.

Scalp

Occipitofrontalis

Consists of 3 parts: frontalis, occipitalis, and galea aponeurotica.
The one associated with facial expression is the frontalis.
Origin: Connective tissue of the scalp.
Insertion: Skin of the frontal regions of the eyebrows.
Action: Pulls the scalp up and back – elevates eyebrows and wrinkles scalp.
Nerve Supply: Facial nerve, temporal branch.
Blood Supply: Superficial temporal & opthalmic arteries.

Neck

Platysma

Origin: Clavicle & shoulder.
Insertion: Lower border of mandible, skin & muscle of lower face & mouth.
Action: Pulls down the corners of the mouth (grimace), and wrinkles skin of the chin & neck.
Nerve Supply: Facial nerve, cervical branch.
Blood Supply: Facial artery & thyrocervical trunk.

Eyes

Orbicularis Oculi

Made up of 2 parts: orbital and palpebrae.
Orbital:
- Horseshoe shape encircling the eye.
- Origin: bone of the upper medial orbital margin.
- Action: Closes the eye forcefully.
Palpebrae:
- Origin: medial palpebral ligament and arches laterally within the eyelid.
- Action: Closes eyes gently (blinking).
Nerve Supply: Facial nerve, zygomatic & temporal branches.
Blood Supply: Superficial temporal, facial & maxillary arteries.

Corrugator

Origin: Bridge of the nose.
Insertion: Skin of the lateral part of eyebrow.
Action: Pulls eyebrows medially (frown).
Nerve Supply: Facial nerve, temporal branch.
Blood Supply: Superficial temporal artery.

Procerus

Origin: Bridge of the nose.
Insertion: Medial end of the eyebrows.
Action: Pulls eyebrows down (frown), and wrinkling of the nose.
Nerve Supply: Facial nerve, zygomatic branch.
Blood Supply: Facial artery.

Nose

Nasalis

Made up of 2 parts: dilator naris and compressor naris.
Nerve Supply: Facial nerve, buccal branches.
Blood Supply: Facial artery.

Dilator Naris

Origin: The nasal margin of the maxilla.
Insertion: Skin of the nostril.
Action: Flares the nostrils.

Compressor Naris

Origin: The top of the maxillary canine ridge.
Insertion: Midline over the nasal cartilage.
Action: Closes the nostrils.

Ears

There are 3 muscles that act on the external ear: Anterior Auricular, Superior Auricular, and Posterior Auricular.

Anterior Auricular

Origin: The scalp and temporal fascia.
Insertion: Anterior medial aspect of the helix of the ear.
Action: Pulls the ear slightly forward.
Nerve Supply: Facial nerve, temporal branch.
Blood Supply: Posterior auricular artery.

Superior Auricular

Origin: Scalp and temporal fascia.
Insertion: Superior medial aspect of the ear.
Action: Raises the ear.
Nerve Supply: Facial nerve, temporal branch.
Blood Supply: Posterior auricular artery.

Posterior Auricular

Origin: Superior lateral aspect of the mastoid process.
Insertion: Inferior medial aspect of the auricle the ear.
Action: Pulls the ear back.
Nerve Supply: Facial nerve, temporal branch.
Blood Supply: Posterior auricular artery.

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Description

Test your knowledge on the muscles of facial expression, including their origins, insertions, actions, and nerve supplies. This quiz covers key muscles like Orbicularis Oris and Levator Labii Superioris, which play crucial roles in facial movements and aesthetics.