Muscles Study Guide

Muscles Study Guide - Temporalis muscle Origin: temporal...

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Temporalis muscle Origin: temporal bone Insertion: coronoid process & ramus of the mandible Action: elevates and contracts mandible for chewing
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Masseter muscle Origin: zygomatic arch Insertion: mandible Action: elevates mandible (closes mouth)
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Orbicularis oculi Origin: medial wall of orbit, frontal and maxillar bones Insertion: circular path around orbit Action: blinking, squinting, forceful closing of eyelids
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Levator palpebrae superioris Origin: root of orbit (lesser wing of sphenoid bone ) Insertion: skin of upper eyelid Action: opens eyelid
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Orbicularis oris muscle Origin: muscle fibers/fibrous tissue surrounding opening of mouth Insertion: skin at corner of mouth Action: kissing, compresses lips against teeth, shapes lips in speech
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Platysma muscle Origin: pectoralis major & deltoid fascia Insertion: mandible , muscles around mouth, skin on lower face Action: Opens and widens Mouth, most superficial muscle
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Sternocleidomastoid muscle Origin: clavicle & manubrium of sternum Insertion: mastoid process Action: flexes neck forward
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Scalenes muscle Origin: transverse process of C1 - C7 Insertion: first and second ribs Action: helps breath by elevating upper ribs, flexes head, rotates head side to side (bobbing for apples muscle)
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Digastric muscle Origin: mastoid notch of temporal bone , mandible Insertion: hyoid bone Action: Retracts mandible, ELEVATES HYOID BONE
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Stylohyoid muscle Origin: styloid process of temporal bone Insertion: hyoid bone Action: ELEVATES HYOID BONE
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Mylohyoid muscle Origin: mandible Insertion: hyoid bone Action: forms floor of mouth, ELEVATES HYOID BONE
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Sternohyoid muscle Origin: clavicle & manubrium of sternum Insertion: hyoid bone Action: DEPRESSES HYOID BONE
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Sternothyroid muscle Origin: sternum Insertion: thyroid cartilage of larynx Action: DEPRESSES HYOID BONE
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Omohyoid muscle Origin: superior border of scapula Insertion: body of hyoid bone Action: DEPRESSES HYOID BONE
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Thyrohyoid muscle Origin: thyroid cartilage of larynx Insertion: hyoid bone Action: DEPRESSES HYOID BONE
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Pectoralis major Origin: medial clavicle, costal cartilage (costals 1-7) Insertion: Intertubercular sulcus of humerus Action: flex upper arm, adducts upper arm across chest
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Pectoralis minor Origin: Anterior ribs 3 - 5 Insertion: coracoid process of scapula Action: downward rotation, abduction
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Serratus anterior Origin: all ribs Insertion: medial border of scapula Action: abduction, and upward rotation
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Internal intercostal muscles Origin: superior ribs 2-12, and margin of sternum Insertion: inferior margin of next higher rib Action: Forcefully contracts and retracts ribs, to assist in forceful inspiration
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External intercostal muscles Origin: inferior margin of ribs 1-11 Insertion: superior margin of next lower rib Action: Elevates ribs to assist in forceful inspiration
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Diaphragm muscle Origin: Xiphoid process of sternum, ribs 7-12, lumbar vertebra Insertion: Central tendon of diaphragm Action: Prime mover of inspiration.
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Trapezius muscle Origin: occipital bone & spines of
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