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T1-GA-Lab UE Mus 3

QuestionAnswer
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
Insertion of latissimus dorsi? bicipital (intertubercular) groove of humerus
Action of Latissimus dorsi? extension, medial rotation, adduction of humerus, medial (downward) rotation of the scapula, assists in depression of the scapula
Innervation of Latissimus dorsi? thoracodorsal n
What does the word Latissimus dorsi mean? Latissimus means widest and dorsi means back (Latin); widest muscle of the back
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
What muscles form the posterior border of the axilla? latissimus dorsi and teres major
What is the origin of Upper Trapezius? external occipital protuberance (EOP), ligamentum nuchae
What is the origin of Middle Trapezius? C7-T3 spinous processes
What is the origin of Lower Trapezius? T4-T12 spinous processes
Insertion of Upper Trapezius? Lateral third of clavicle
Insertion of Middle Trapezius? Spine of scapula
Insertion of Lower Trapezius? Root of the spine of the scapula
Action of Upper Trapezius? Elevation, lateral(upward) rotation of the scapula
Action of Middle Trapezius? Adduction (retraction) of the scapula
Action of the Lower Trapezius? Depression, Lateral (upward) rotation of the scapula
Innervation of Trapezius? Accessory n (CNXI), spinal part (motor); C3,4 spinal nerves
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’
Origin of Levetor Scapula? C1-4 transverse processs
Insertion of Levetor scapula? Vertebral border of scapula from superior angle to root of spine
Action of Leveltor scapula? elevation and medial (downward) rotation of scapula
Innervation of Levetor Scapula? Dorsal scapula n; C3, 4 spinal nerves
What motions do the scapularthoracic joint make? elevation, depression, adduction, abduction, medial and lateral rotation, and anterior and posterior tilt motions
What muscles shrug your shoulders? Upper trapezius and the levetor scapula
Origin of Rhomboid minor? C7 and T1 (spinous processes)
Origin of Rhomboid major? T2-T5 (spinous processes)
Insertion of Rhomboid minor? Root of spine of scapula
Insertion of the Rhomboid major? Vertebral border of the scapula from root of spine to inferior angle
Action of Rhomboids major and minor? Adduction (retraction), Medial (upward) rotation of the scapula
Innervation of Rhomboids major and minor? Dorsal scapular n
What muscles form a chevron shape? Rhomboids
Origin of Supraspinatus? Supraspinous fossa of scapula
Insertion of Supraspinatus? Greater tubercle of humerus (superior facet)
Action of Supraspinatus? Abduction, Scaption of humerus; Stabilization of head of humerus
Innervation of Supraspinatus? Suprascapular n
What muscles make up the rotator cuff? Supraspinatus, Infraspinatus, Teres Minor and Subscapularis (SITS)
What crucial movement is Supraspinatus responsible for? The first 15 degress of humeral abduction (initiation)—effective stabilizer and reinforce of the shoulder joint capsule
Origin of Infraspinatus? Infraspinous fossa of scapula
Insertion of Infraspinatus? Greater tubercle of humerus (middle facet)
Action of Infraspinatus? Lateral rotation and extension of the humerus
Innervation of Infraspinatus? suprascapular n
What function does Infraspinatus perform? assisting in reinforcement of the shoulder joint capsule and stabilization of the head of the humerus
Origin of Teres minor? Upper 2/3 of axillary border of scapula
Insertion of Teres minor? Greater tubercle of humerus (inferior facet)
Action of Teres minor? Lateral rotation and extension of humerus
Innervation of Teres minor? Axillary n
What function does Teres minor provide? stabilization and reinforcement of the shoulder capsule
Created by: jmml
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