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Exam 6 A&P
Origin-Insertion-Action-Innervation of Upper Limb
| Question | Answer |
|---|---|
| Origin of Teres Major | Inferior angle and lower one-third part of the lateral border of the scapula |
| Insertion of Teres Major | crest of the less tubercle of the humerus |
| Innervation of Teres Major | Lower subscapular nerve (C5,6,7) |
| Action of Teres Major | Extends, Adduction and medial rotation of the glenohumeral joint |
| Origin of Teres Minor | upper two-thirds of Lateral border of the scapula (middle part) |
| Insertion of Teres Minor | Greater tubercle of the humerus (inferior facet) |
| Action of Teres Minor | Lateral rotation and adduct of the shoulder (Arm) at glenohumeral joint, stabilization of the head of humerus, as part of the rotator cuff muscles in glenoid cavity |
| Innervation of Teres Minor | Axillary nerve (C5, 6) |
| Origin of Infraspinatus | Infraspinous fossa of the scapula |
| Insertion of Infraspinatus | Greater tubercle of the humerus (middle facet) |
| Action of Infraspinatus | Lateral rotation and adduct of the Shoulder (arm) at (glenohumeral joint), stabilization of the humerus as part of the rotator cuff muscles (glenoid cavity) |
| Innervation of Infraspinatus | Suprascapular nerve (C4, 5, 6) |
| Origin of Supraspinatus | Supraspinous fossa of the scapula |
| Insertion of Supraspinatus | Greater tubercle of the humerus (superior facet) |
| Action of Supraspinatus | Assistance in arm abduction, stabilization of the humerus as part of the rotator cuff muscles; Stabilization of head of humerus in glenoid cavity |
| Innervation of Supraspinatus | Suprascapular nerve (C4, 5, 6) |
| Origin of Serratus anterior | Lateral parts (external surface) of the 1st to 8th ribs |
| Insertion of Serratus anterior | Anterior Surface Medial border of the scapula |
| Action of Serratus anterior | Adduct, upwardly rotate, and depress scapula at scapulothoracic joint (S/T joint); may elevate thorax during inhalation with scapula fixed |
| Innervation of Serratus anterior | Long thoracic nerve (C5, 6, 7, 8) |
| Origin of Subscapularis | Subscapular fossa |
| Insertion of Subscapularis | Lesser tubercle of the humerus |
| Action of Subscapularis | Medial rotation of the arm, stabilization of the humerus as part of the rotator cuff muscles |
| Innervation of Subscapularis | Upper and lower subscapular nerves |
| Origin of Levator scapulae | Transverse process of the atlas and axis, posterior tubercles C3 and C4 |
| Insertion of Levator scapulae | Posterior surface of the medial scapular border (from the superior angle to the root of the spine of the scapula) |
| Action of Levator scapulae | Elevation of the scapula |
| Innervation of Levator scapulae | Anterior rami of the nerves C3 and C4, dorsal scapular nerve (branch of the C5) |
| Origin of Rhomboid major | spinous processes of T2 to T5 |
| Insertion of Rhomboid major | medial border of scapula from the level of the spine to the inferior angle |
| Action of Rhomboid major | retraction and fixation of the scapula on the thoracic wall |
| Innervation of Rhomboid major | dorsal scapular nerve |
| Origin of Rhomboid minor | nuchal ligament, spinous processes of C7 and T1 vertebrae |
| Insertion of Rhomboid minor | medial end of the scapular spine |
| Action of Rhomboid minor | retraction and fixation of the scapula on the thoracic wall |
| Innervation of Rhomboid minor | dorsal scapular nerve |
| Origin of Trapezius | medial portion of Superior nuchal line of occiput, external occipital protuberance, nuchal ligament, spinous processes of C7 to T12 vertebrae |
| Insertion of Trapezius | Lateral third of the clavicle, acromion and spine of the scapula |
| Action of Trapezius | Elevation, depression, and retraction of the scapula |
| Innervation of Trapezius | Spinal portion of cranial nerves XI (accessory) and ventral ramus (C2, 3, 4) |
| Action of Upper fibers of Trapezius bilaterally | extend neck and head |
| Action of Upper fibers of Trapezius unilaterally | Lateral flex head and neck to same side-Rotate head and neck opposites side-Elevate & Upwardly rotate scapula at scapulothoracic joint) |
| Action of middle fibers of Trapezius | Adduct and stabilize the scapula at scapulothoracic joint |
| Action of lower fibers of Trapezius | Depress and upwardly rotate the scapula at scapulothoracic joint |
| Four muscle of Rotator Cuff; |
Created by:
JML19
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