Test_Three_Study_Guide

Test_Three_Study_Guide - TestThreeStudyGuide Anatomy...

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Test Three Study Guide Anatomy
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Muscles Chapters 9 and 10
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Identify the Following  Muscles.
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Sterno(cleido)mastoid O: Manubrium of sternum and medial  portion of clavicle I: Mastoid process of temporal bone and  superior nuchal line of occipital bone Action: Flexes and laterally rotates the  head Nerve: Accessory nerve and branches of  cervical spinal nerves (C 2  and C 3 )
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Trapezius O: Occipital bone, ligamentum nuchae,  and spinous processes of C 7  and all  thoracic vertebrae I: A continuous insertion along acromion  and spine of scapula, and lateral 3 rd  of  clavicle. Action: Stabilizes, raises, and retracts, and  rotates scapula Nerve: Accessory (XI) and C 3  and C 4
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Latissimus Dorsi O: Indirect attachment via lumbodorsal fascia  into spines of lower six thoracic vertebrae,  lumbar vertebrae, lower 3 to 4 ribs, and iliac  crest; also from scapula’s inferior angle. I: Spirals around teres major to insert in floor  of intertubercular sulcus of humerus Action: Prime mover of arm extension;  powerful arm adductor; medially rotates arm  at shoulder Nerve: Thoracodorsal (C 6 -C 8 )
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Deltoid O: Embraces insertion of the trapezius;  lateral third of clavicle; acromion and spine  of scapula I: Deltoid tuberosity of humerus Action: Prime mover of arm abduction  when all its fibers contract simultaneously Nerve: Axillary
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Serratus Anterior O: By a series of muscle slips from ribs 1- 8 (or 9) I: Entire anterior surface of vertebral  border of scapula Action: rotates scapula so that its inferior  angle moves laterally and upward Nerve: Long thoracic nerve (C 5 -C 7 )
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Rhomboids: Minor (Top) and Major  (Bottom) O: Spinous processes of C 7  and T 1  (Minor)  and spinous processes of T 2 -T 5  (Major) I: Medial border of scapula Action: Stabilize Scapula Nerve: Dorsal; Stabilize Nerve (C 4  and C 5 )
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Rotator Cuff Muscles (S.I.T.S.) A: Subscapularis B: Infraspinatus C: Supraspinatus D: Teres Minor
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Descriptions of Rotator Cuff  Muscles Subscapularis O: Subscapular fossa of scapula I: Lesser tubercle of humerus Action: Chief medial rotator of  humerus; helps stabilize the  should joint Nerve: Subscapular (C 5 -C 7 ) Infraspinatus O: Infraspinous fossa of scapula I: Greater tubercle of humerus  posterior to insertion of  supraspinatus Action: Rotates humerus in  glenoid cavity; stabilizing the  shoulder joint Nerve: Suprascapular Teres Minor O: Laterbal border of dorsal  scapular surface I: Greater tubercle of humerus  inferior to infraspinatus insertion Action: Rotates humerus  laterally; helps to hold head of 
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Test_Three_Study_Guide - TestThreeStudyGuide Anatomy...

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