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T1-GA-Lab UE Mus 4
| Question | Answer |
|---|---|
| Origin of subscapularis? | Subscapular fossa of scapula |
| Insertion of subscapularis? | lesser tubercle of humerus |
| Action of subscapularis? | Medial rotation and adduction of humerus |
| Innervation of Subscapularis? | Upper and lower subscapular ns |
| Origin of Teres Major? | Inferior angle of scapula (dorsal surface), lower third of axillary border of scapula |
| Insertion of Teres Major? | Medial lip of bicipital groove of humerus |
| Action of Teres Major? | Extension, Medial rotation, and Adduction of humerus |
| Innervation of Teres Major? | Lower subscapular n |
| What muscle does Teres Major lie superior to? What do they form? | Latissumus dorsi, and they form the posterior border of the axilla—share the same actions |
| What muscles work together to pull downward (stabilization) on the head of the humerus during abduction? | infraspinatus, teres minor, and teres major |
| Origin of the Anterior Deltoid? | Lateral third of the scapula |
| Origin of the Middle Deltoid? | Acromion of scapula-lateral surface |
| Origin of the Posterior Deltoid? | Spine of the scapula |
| Insertion of the Deltoids? | deltoid tuberosity of the humerus |
| Action of the Anterior Deltoid? | Flexion, Horizontal adduction, and medial rotation of humerus |
| Action of the Middle Deltoid? | Abduction of humerus to 90 degress |
| Action of the Posterior Deltoid? | Extension, Horizontal abduction, lateral rotation, and scaption of humerus |
| Innervation of the deltoids? | Axillary n |
| What muscle initiates abduction of the humerus for the deltoids, and why? | supraspinatus, and because the angle of pull |
| Origin of Serratus Posterior Superior? | Ligamentum nuchae-caudal portion, C7-T3 vertebrae—spinous processes |
| Insertion of Serratus Posterior Superior? | Ribs 2-5 superior border |
| Action of Serratus Posterior Superior? | Elevation of ribs to increase thoracic cavity during inspiration |
| Innervation of Serratus Posterior Superior? | Intercostal ns T1-4 |
| Origin of Serratus Posterior Inferior? | T11, 12, and L1-3 vertebrae-spinous processes |
| Insertion of Serratus Posterior Inferior? | Ribs 8-12-inferior border |
| Action of Serratus Posterior Inferior? | Depression of ribs outward counteracting the inward pull of the diaphragm during expiration |
| Innervation of Serratus Posterior Inferior? | Intercostal ns T9-12 |
| Origin of Serratus Anterior? | Lateral surface of upper 8 ribs (by finger-like slips) |
| Insertion of Serratus Anterior? | Vertebral border of scapula (anterior surface) |
| Action of Serratus Anterior? | Abduction (protraction) and Lateral (upward) rotation of the scapula, Stabilizes scapula against chest wall, depression of scapula (lower fibers), assists in forced exhalation |
| Innervation of Serratus Anterior? | Long Thoracic nerve |
| Weakness in what muscles causes “winged scapula? | Serratus Anterior |
| What muscle does the serratus anterior interdigitate with? | external obliques |
| Which muscle is the strongest abductor of the scapuls? | serratus anterior |
| When the muscles of the humerus move it, what muscle counters and how? | Serratus anterior, holds the scapula against chest wall to provide an origin for those muscles |
| Origin of Pectoralis Major? | Clavicular head:medial half of clavical; sternocostal head:sternum, cartilages of superior 6 ribs, and abneuoris of external oblique muscles |
| Insertion of Pectoralis Major? | Lateral lip of bicipial (intertubercular) groove of the humerus |
| Action of Pectoralis Major? | Adduction, Horizontal adduction, and Medial rotation of the humerus. Clavicular head:flexion of the humerus; Sternocostal head: extension of the humerus, assists anterior tilt of scapula |
| Innervation of Pectoralis Major? | Clavicular head:Lateral and medial pectoral ns (C5, 6) and Sternocostal head:medial pectoral n (C7,8, T1) |
| What muscle forms the anterior wall of the axilla? | Pectorialis major |
| Origin of Pectoralis Minor? | Anterior surface of ribs 3,4.5 near costal cartilages |
| Insertion of Pectoralis Minor? | Coracoid process of scapula (medial border of superior surface) |
| Action of Pectoralis minor? | Abduction (protraction), depression, medial (downward roation), and anterior tilt of scapula; assists in inhalation |
| Innervation of Pectoralis Minor? | Medial pectoral n (C8, T1) |
| Origin of Subclavius? | 1st rib costocartilage junction |
| Insertion of Subclavius? | Inferior shaft of clavicle –middle 1/3 |
| Action of subclavius? | Depresses clavicle, and stabilizes sternoclavicular joint |
| Innervation of subclavius? | Subclavian n |
| What prevents extreme elevation and protraction of the clavicle? | Subclavius |
Created by:
jmml
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