T1-GA-Lab UE Mus 3
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| Origin of Latissimus dori? | thorocolumbar aponeurosis; lower 6 thoracic spinous processes, sacrum, iliac crest of ilium, lower 3-4 ribs, inferior angle of the scapula
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| Insertion of latissimus dorsi? | bicipital (intertubercular) groove of humerus
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| Action of Latissimus dorsi? | extension, medial rotation, adduction of humerus, medial (downward) rotation of the scapula, assists in depression of the scapula
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| Innervation of Latissimus dorsi? | thoracodorsal n
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| What does the word Latissimus dorsi mean? | Latissimus means widest and dorsi means back (Latin); widest muscle of the back
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| What major (gross) movements is latissimus dorsi involved with? | powerful extensor of a flexed humerus –swimming, chopping with an axe, and pulling the shoulder girdle down when using crutches
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| What muscles form the posterior border of the axilla? | latissimus dorsi and teres major
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| What is the origin of Upper Trapezius? | external occipital protuberance (EOP), ligamentum nuchae
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| What is the origin of Middle Trapezius? | C7-T3 spinous processes
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| What is the origin of Lower Trapezius? | T4-T12 spinous processes
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| Insertion of Upper Trapezius? | Lateral third of clavicle
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| Insertion of Middle Trapezius? | Spine of scapula
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| Insertion of Lower Trapezius? | Root of the spine of the scapula
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| Action of Upper Trapezius? | Elevation, lateral(upward) rotation of the scapula
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| Action of Middle Trapezius? | Adduction (retraction) of the scapula
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| Action of the Lower Trapezius? | Depression, Lateral (upward) rotation of the scapula
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| Innervation of Trapezius? | Accessory n (CNXI), spinal part (motor); C3,4 spinal nerves
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| What is the most superficial muscle of the back, and what is it made up of? | Trapezium, and it is made up of the upper, middle, and lower trapezius’
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| Origin of Levetor Scapula? | C1-4 transverse processs
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| Insertion of Levetor scapula? | Vertebral border of scapula from superior angle to root of spine
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| Action of Leveltor scapula? | elevation and medial (downward) rotation of scapula
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| Innervation of Levetor Scapula? | Dorsal scapula n; C3, 4 spinal nerves
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| What motions do the scapularthoracic joint make? | elevation, depression, adduction, abduction, medial and lateral rotation, and anterior and posterior tilt motions
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| What muscles shrug your shoulders? | Upper trapezius and the levetor scapula
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| Origin of Rhomboid minor? | C7 and T1 (spinous processes)
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| Origin of Rhomboid major? | T2-T5 (spinous processes)
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| Insertion of Rhomboid minor? | Root of spine of scapula
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| Insertion of the Rhomboid major? | Vertebral border of the scapula from root of spine to inferior angle
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| Action of Rhomboids major and minor? | Adduction (retraction), Medial (upward) rotation of the scapula
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| Innervation of Rhomboids major and minor? | Dorsal scapular n
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| What muscles form a chevron shape? | Rhomboids
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| Origin of Supraspinatus? | Supraspinous fossa of scapula
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| Insertion of Supraspinatus? | Greater tubercle of humerus (superior facet)
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| Action of Supraspinatus? | Abduction, Scaption of humerus; Stabilization of head of humerus
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| Innervation of Supraspinatus? | Suprascapular n
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| What muscles make up the rotator cuff? | Supraspinatus, Infraspinatus, Teres Minor and Subscapularis (SITS)
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| What crucial movement is Supraspinatus responsible for? | The first 15 degress of humeral abduction (initiation)—effective stabilizer and reinforce of the shoulder joint capsule
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| Origin of Infraspinatus? | Infraspinous fossa of scapula
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| Insertion of Infraspinatus? | Greater tubercle of humerus (middle facet)
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| Action of Infraspinatus? | Lateral rotation and extension of the humerus
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| Innervation of Infraspinatus? | suprascapular n
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| What function does Infraspinatus perform? | assisting in reinforcement of the shoulder joint capsule and stabilization of the head of the humerus
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| Origin of Teres minor? | Upper 2/3 of axillary border of scapula
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| Insertion of Teres minor? | Greater tubercle of humerus (inferior facet)
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| Action of Teres minor? | Lateral rotation and extension of humerus
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| Innervation of Teres minor? | Axillary n
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| What function does Teres minor provide? | stabilization and reinforcement of the shoulder capsule
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