Major Skeletal Muscles - Major Skeletal Muscles The major...

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Major Skeletal MusclesThe major skeletal muscles are described in following tables and figures. TABLE 1Muscles of the Head and NeckMuscleOrigin/InsertionActionEpicranius:frontalisO: galea aponeurotica I: skin around eyesraises eyebrows; surprisedEpicranius:occiptalisO: occipital bone I : galea aponeuroticapulls scalp back; surprisedOrbicularis oculiO: maxillary & frontal bones I: eyelidscloses eyelids; blinkingOrbicularis orisO: muscle fibers around mouth I: skin around mouthcloses lips; kissingBuccinatorO: maxilla & mandible I: orbicularis oriscompresses cheek; whistlingPlatysmaO: fascia in upper chest I: mandible & corner of mouthlowers mandible; opens mouthMentalisO: mandible I: skin of chinprotrudes lower lip; poutingRisoriusO: fascia on masseter muscle I: skin at corner of mouthlateral movement of lips; grimacingZygomaticusO: zygomatic bone I: skin around mouthraises edges of mouth; smilingLevator labi superiorisO: infroarbital margin of maxilla I: skin of upper lipraises upper lip; as in disgustDepressor labi inferiorisO: mandible I: skin of lower liplowers lower lipTemporalisO: parietal bone I: mandibleraises mandible; closes mouthMasseterO: zygomatic arch I: mandibleraises mandible; closes mouthMedial pterygoidO: sphenoid & maxilla I: mandibleraises mandible; side-to-side mouth motionLateral pterygoidO: sphenoid & maxilla I: mandibleraises mandible; side-to side mouth motionSternocleidomastoidO: ternum & clavicle I: temporal boneflexes & rotates headSplenius capitisO: cervical & thoracic vertebrae I: temporal bonerotates, bends, or extends headSemispinalis capitisO: cervical & thoracic vertebrae I: occipital bonerotates or extends headLongissimusO: cervical & thoracic vertebrae I: temporal bonerotates, bends, or extends headOmohyoid

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