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Lecture 11 Muscles
Terms in this set (24)
- Contains 2 parts: Orbital and Palpebral Parts
- Action: Closes eyelid • Palpebral (P) part: Gently closes eyelid. • Orbital (O) part: Tightly closes eyelids; winks.
• Origin: Maxilla and frontal bones • Insertion: Circles orbit and inserts near origin.
- Action: Closes lips
• Origin: Nasal septum, maxilla, and mandible.
• Insertion: Mucous membrane of lips.
- Action: Dilates nostril
• Origin: Maxilla
• Insertion: Bridge and ala (wing) of nose.
Levator Labii Superioris Alaeque Nasi
- Action: Elevates Ala of Nose and upper lip. • Origin: Maxilla • Insertion: Ala (wing) of nose and upper lip.
Levator Labii Superioris
- Action: Elevates upper lip • Origin: Infraorbital margin of maxilla. • Insertion: Skin at angle of mouth & orbicularis oris.
Zygomaticus Minor and Major
- Action: Elevate & abduct upper lip. • Origin: Both muscles originate at the zygomatic bone. • Insertions: Minor - Orbicularis oris and upper lip. Major - Angle of the mouth
Levator Anguli Oris
- Deep to Levator Labii Superioris and Zygomaticus muscles. - Action: Dilates nostril • Origin: Maxilla • Insertion: Angle of mouth & orbicularis oris.
- Action: Abducts angle of the mouth. • Origin: Skin of cheek & fascia near parotid gland. • Insertion: Angle of the mouth & Orbicularis Oris.
- Located deep to the Risorius. • The parotid duct pierces through Buccinator. - Action: Retracts angle of mouth; Flattens cheeks. • Origin: Mandible and maxilla. • Insertion: Angle of the mouth & Orbicularis Oris.
Depressor Anguli Oris
- Action: Depresses angle of mouth. - Origin: Lower border of mandible. - Insertion: Skin of lip near angel of mouth.
Depressor Labii Inferioris (Deep Muscle)
- Action: Depresses lower lip. - Origin: Lower border of Mandible. - Insertion: Lower lip & Orbicularis Oris
- Action: Elevates & wrinkles skin over chin; protrudes lip. - Origin: Mandible - Insertion: Skin of chin.
- Action: • Depresses lower lip. • Wrinkles skin of neck and upper chest.
- Origin: • Fascia of Deltoid • Pectoralis Major
- Insertion: • Skin over inferior border of mandible.
- Action: • Draws scalp anteriorly (frontal portion) • Raises brow (frontal portion) • Wrinkles skin of forehead horizontally (frontal portion) • Draws scalp posteriorly (occipital portion)
- Origins: • Frontal Part: Epicranial Aponeurosis. • Occipital Part: Occipital Bone.
- Insertion: • Frontal Part: Skin superior to supraorbital margin. • Occipital Part: Epicranial Aponeurosis.
- Action: • Creates horizontal wrinkles • Wrinkles between eyes as in frowning.
- Origin: Bridge of nose. - Insertion: Frontal portion of Occipitofrontalis.
- Action: • Draws eyebrows medially and inferiorly. • Creates vertical wrinkles above the nose.
- Origin: Bridge of nose. - Insertion: Skin of eyebrow.
Levator Palpebrae Superioris
- Action: Elevates upper eyelid. - Origin: Lesser wing of the sphenoid - Insertion: Skin of the upper eyelid. • Does not insert into eye.
- 3 parts: Anterior, Posterior, and Superior. - Action: Draw auricles anteriorly, posteriorly, and superiorly. - Origins: • Aponeurosis (anterior and superior bellies) • Mastoid process (posterior belly) - Insertion: Cartilage of auricle.
- Action: Elevates and adducts eye;
Medially rotates eye.
- Action: Abducts eye.
- Action: Depresses eye and adducts eye; Laterally rotates eye.
- Action: Adducts eye.
- Action: • Depresses and abducts eye; • Medially rotates eye.
• Origin: Sphenoid bone (superior and middle to common tendinous ring in orbit).
• Insertion: Superior and lateral eye via tendon that passes through trochlea.
- Action: • Elevates and abducts eye; • Laterally rotates eye. • Origin: Maxilla (in floor of orbit) • Insertion: Inferior and lateral eye.
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