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Lab 17

Muscles of Head & Neck

QuestionAnswer
Levator Scapulae : Origin? C1-C4
Which muscle inserts @ upper vertebral border of scapula? Levator Scapulae
Levator Scapulae: Action? abducts and rotates neck; elevates scapula (shrug)
Which muscle originates @ transverse process of cervical vertebrae? Scalenes (anterior, middle, posterior)
Scalenes (anterior, middle, posterior) : Insertion? Ribs 1 & 2
Action: flexes & rotates neck; elevates ribs 1 & 2 Scalenes (anterior, middle, posterior)
Sternocleidomastoid: Origin? sternum, clavicle
Which muscle inserts @ mastoid process of temporal bone? Sternocleidomastoid
Sternocleidomastoid: Action? abducts, rotates, flexes head
Action is: Depresses the hyoid bone ... what are we (2 muscles) ? Sternohyoid and/or Omohyoid
Sternothyroid : Action? Depresses Thyroid cartilage
Omohyoid: Action? depresses hyoid bone
Platysma: Action? depresses lower lip, opens jaw
Elevates, protracts, and retracts hyoid; OPENS MANDIBLE Digastric
Mylohyoid: Action? Elevates tongue and hyoid.
Occipitofrontalis (occipital portion) aka "Occipital" : Action? draws scalp posteriorly
Occipitofrontalis (frontal portion) aka "Frontalis" : Action? raises eyebrows, draws scalp anteriorly
What are the 4 major muscles of Mastication (chewing)? Temporalis, Masseter, Medial Pterygoid, Lateral Pterygoid
What is the origin of Temporalis, Masseter, Medial Pterygoid, Lateral Pterygoid? originate from the skull
Temporalis, Masseter, Medial Pterygoid, Lateral Pterygoid : Insertion? Inserts on the mandible
Action of Temporalis and Masseter? Closes Mandible
Which 2 mastication muscles allow for grinding? (action: moves mandible side to side) Medial and Lateral Pterygoid
Specific origin of Temporalis? Temporal Fossa
Specific insertion of Temporalis? coronoid process ; ramus of mandible
Specific origin of Masseter? Zygomatic Arch
Specific insertion of Masseter? angle and ramus of mandible
Medial Pterygoid: Action? moves mandible side to side ; elevates mandible
Lateral Pterygoid: Action? moves mandible side to side ; opens jaw ; protrudes mandible
Orbicularis Oculi: Origin? Frontal bone and maxilla on medial margin of orbit
Which muscle inserts @ skin of eyelid? Orbicularis Oculi
Orbicularis Oculi: Action? closes eyelids
Originates at fascia of facial muscles near the mouth? Orbicularis Oris
Orbicularis Oris : Insertion? skin of lips
Orbicularis Oris: Action? closes lips
Corrugator Supercilii: Action? adducts eyebrows (pulls eyebrows medially)
Which muscle abducts corners of mouth? Risorius
Buccinator : Action? compresses cheeks
Which muscle action is protrusion of lower lip (pout) ? Mentalis
Zygomaticus (major & minor) : Action Smiling - draws corners of mouth posteriorly and superiorly
Depressor Labii Inferioris : Action? depresses lower lip
Levator Labii Superioris elevates upper lip ; flares nostrils
Created by: 1407187836
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