EXSC 440 Final Exam Questions and Complete Solutions.

EXSC 440 Final Exam Questions and Complete Solutions Abdominal Press - Correct Ans: stabilizing the spinal column by raising the intra-abdominal pressure Muscles of Inspiration - Correct Ans: Diaphragm External intercostals Internal intercostals (interchondral part) Scalenes Sternocleidomastoid Muscles of expiration - Correct Ans: Internal intercostals (excluding interchondral part) External abdominal oblique Internal abdominal oblique Transversus abdominus Rectus abdominus Sternocleidomastoid - Correct Ans: Origin: Sternal head: Manumbrium. Clavicular head: Medial third of clavicle Insertion: Mastoid process and superior nuchal line Actions: Tilts head to same side and rotates to opposite side. Extends head. Assists in respiration Innervation: Accessory nerve XII. Cervical plexus Deltoid - Correct Ans: Origin: Lateral part of clavicle, acromion, spine of scapula Insertion: Deltoid tuberosity of humerus Action: Shoulder abduction Anterior head - Shoulder flexion, horizontal adduction and internal rotation Posterior head - Shoulder extension, horizontal abduction and external rotation Innervation: Axillary (C5 6) Pectoralis major - Correct Ans: Origin: Medial part of clavicle, sternum, ribs 2-6 Insertion: Lateral lip of intertubercular groove of the humerus Action: Shoulder adduction, internal rotation, flexion, extension and horizontal adduction Innervation: Lateral and medial pectoral: Clavicular (C5 6); Sternal (C7 8 T1) Subscapularis - Correct Ans: Origin: Subscapular fossa of scapula Insertion: Lesser tubercle of humerus Action: Shoulder internal rotation Innervation: Upper and lower subscapular (C5 6 7) Coracobrachilalis - Correct Ans: Origin: Coracoid process Insertion: Medial aspect of humerus, halfway down Action: Shoulder flexion and adduction Innervation: Musculocutaneous (C6 7) Biceps brachii - Correct Ans: Origin: Long head - supraglenoid tubercle; Short head - coracoid process Insertion: Radial tuberosity and lacertus fibrosus Action: Elbow flexion and supination, shoulder flexion Innervation: Musculocutaneous (C5 6) Lattisimus Dorsi - Correct Ans: Origin: Lower six thoracic spines, lumbar and sacral spines, iliac crest Insertion: Intertubercular groove on humerus - usually receives fibers on inferior angle of the scapula Action: Shoulder adduction, extension and internal rotation, shoulder girdle depression Innervation: Thoracodorsal (C6 7 8) Teres Major - Correct Ans: Origin: Dorsal surface of axillary border of scapula near inferior angle Insertion: Medial lip of intertubercular groove Action: Shoulder extension, adduction and internal rotation Innervation: Lower subscapular (C5 6 7) Triceps brachii - Correct Ans: Origin: Long head - infraglenoid tubercle; Lateral head - posterior side of humerus from middle of shaft to greater tuberosity; Medial head - lower posterior part of humerus Insertion: Olecranon process of ulna Action: Long head - shoulder extension and adduction; all parts - elbow extension Innervation: Radial (C6 7 8 T1) Supraspinatus - Correct Ans: Origin: Supraspinous fossa of scapula Insertion: Greater tubercle of humerus, upper facet Action: Shoulder abduction Innervation: Suprascapular (C4 5 6) Infraspinatus - Correct Ans: Origin: Infraspinous fossa of scapula Insertion: Middle facet of greater tubercle of humerus Action: Shoulder external rotation Innervation: Suprascapular (C(4) 5 6) Teres Minor - Correct Ans: Origin: Dorsal surface of axillary border of scapula Insertion: Lower facet or greater tubercle of humerus Action: Shoulder external rotation Innervation: Axillary (C5 6) Trapezius - Correct Ans: Origin: External occipital protuberance, li