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Head, Back, Neck, Ab

QuestionAnswer
Frontalis Action: Raises Eyebrows Synergist: Occipitalis
Occipitalis Action: Raises eyebrows Synergist: Frontalis (connects to frontalis muscle via epicranial aponeurosis)
Sternocleidomastoid Action: Flexion of neck, lateral Flexion of neck Origin: Sternum, clavicle Insertion: Mastoid process
Epicranial Aponeurosis a tough layer of connective tissue that connects the frontalis with the occipitalis
Orbicularis Oculi Action: Closes eye
Zygomaticus Minor Action: smiling Synergist: Zygomaticus major Antagonist: Playsma
Zygomaticus Major Action: smiling Synergist: Zygomaticus minor Antagonist: Playsma
Buccinator Action: Compresses cheeks (as in blowing)
Platysma Action: Pulls mouth downward Antagonist: Zygomaticus minor + major
Masseter Action: elevation of mandible Synergist: temporalis, medial pterygoid Antagonist: lateral pterygoid
Temporalis Action: elevation of mandible Synergist: masseter, medial pterygoid Antagonist: lateral pterygoid
Lateral pterygoid Action: depresses mandible Antagonist: medial pterygoid, temporalis, masseter
Medial pterygoid Action: elevation of mandible Synergist: masseter, temporalis Antagonist: lateral pterygoid
Longissimus Action: extension of spine Synergist: iliocostalis, spinals - most intermediate - run along each side of back
Iliocostalis Action: extension of spine, lateral Flexion of spine Synergist: longissimus, spinalis - most lateral - run along each side of back
Spinalis Action: extension of spine Synergist: longissimus, iliocostalis - most medial - run along each side of back
Rectus abdominis - in middle Action: flexion of spine Synergist: internal oblique, external oblique Fiber direction: Up + Down
Internal oblique Action: rotation of spine, flexion of spine Synergist: external oblique, rectus abdominis, transversus abdominis - layered between external oblique and transverse abdominal (middle)
Transversus Abdominis Action: rotation of spine Synergist: internal oblique, external oblique - deepest side muscle
External oblique Actions: rotation of spine, flexion of spine Synergist: rectus Abdominis, internal oblique, transversus abdominis - most superficial side muscle
Diaphragm Action: pulls down on the thoracic cavity (expands thoracic cavity)
Internal intercostal muscles Action: pull ribs down + inward (exhaling) Fiber direction: medially to laterally downward
External intercostals muscles Action: pull ribs up and out (inhaling) Fiber direction: laterally to medially downward
Created by: Shannonnev0822
 

 



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