level: Shoulder and Arm
Questions and Answers List
Shoulder and Arm MOINA
level questions: Shoulder and Arm
| Question | Answer |
|---|---|
| Pectoralis Major | O - Clavicle, sternum, and upper six costal cartilages I - Lateral lip of bicipital groove of humerus N - Medial and lateral pectoral nerves from brachial plexus A - Adducts arm and rotates it medially; clavicular fibers also flex arm |
| Pectoralis Minor | O - Third, fourth, and fifth ribs I - Coracoid process of scapula N - Medial pectoral nerve from brachial plexus A - Depresses point of shoulder; if the scapula is fixed, it elevates the ribs of origin |
| Subclavius | O - First costal cartilage I - Clavicle N - Nerve to subclavius from upper trunk of brachial plexus A - Depresses the clavicle and steadies this bone during movements of the shoulder girdle |
| Serratus anterior | O - Upper eight ribs I - Medial border and inferior angle of scapula N - Long thoracic nerve A - Draws the scapula forward around the thoracic wall; rotates scapula |
| Trapezius | O - Occipital bone, ligamentum nuchae, spine of seventh cervical vertebra, spines of all thoracic vertebrae I - Upper fibers into lateral third of clavicle; middle and lower fibers into acromion and spine of scapula N - Spinal part of accessory nerve (motor) and C3 and 4 (sensory) A - Upper fibers elevate the scapula; middle fibers pull scapula medially; lower fibers pull medial border of scapula downward |
| Latissimus dorsi | O - Iliac crest, lumbar fascia, spines of lower six thoracic vertebrae, lower three or four ribs, and inferior angle of scapula I - Floor of bicipital groove of humerus N - Thoracodorsal nerve A - Extends, adducts, and medially rotates the arm |
| Levator scapulae | O - Transverse processes of first four cervical vertebrae I - Medial border of scapula N - C3 and 4 and dorsal scapular nerve A - Raises medial border of scapula |
| Rhomboid minor | O - Ligamentum nuchae and spines of seventh cervical and first thoracic vertebrae I - Medial border of scapula N - Dorsal scapular nerve A - Raises medial border of scapula upward and medially |
| Rhomboid major | O - Second to fifth thoracic spines I - Medial border of scapula N - Dorsal scapular nerve A - Raises medial border of scapula upward and medially |
| Deltoid | O - Lateral third of clavicle, acromion, spine of scapula I - Middle of lateral surface of shaft of humerus N - Axillary nerve A - Abducts arm; anterior fibers flex and medially rotate arm; posterior fibers extend and laterally rotate arm |
| Supraspinatus | O - Supraspinous fossa of scapula I - Greater tuberosity of humerus; capsule of shoulder joint N - Suprascapular nerve A - Abducts arm and stabilizes shoulder joint |
| Infraspinatus | O - Infraspinous fossa of scapula I - Greater tuberosity of humerus; capsule of shoulder joint N - Suprascapular nerve A - Laterally rotates arm and stabilizes shoulder joint |
| Teres major | O - Lower third of lateral border of scapula I - Medial lip of bicipital groove of humerus N - Lower subscapular nerve A - Medially rotates and adducts arm and stabilizes shoulder joint |
| Teres minor | O - Upper two thirds of lateral border of scapula I - Greater tuberosity of humerus; capsule of shoulder joint N - Axillary nerve A - Laterally rotates arm and stabilizes shoulder joint |
| Subscapularis | O - Subscapular fossa I - Lesser tuberosity of humerus N - Upper and lower subscapular nerves A - Medially rotates arm and stabilizes shoulder joint |
| Long head of Biceps Brachii | O - Supraglenoid tubercle of scapula I - Tuberosity of radius and bicipital aponeurosis into deep fascia of forearm N - Musculocutaneous nerve A - Supinator of forearm and flexor of elbow joint; weak flexor of shoulder joint |
| Short head of Biceps Brachii | O - Coracoid process of scapula I - Tuberosity of radius and bicipital aponeurosis into deep fascia of forearm N - Musculocutaneous nerve A - Supinator of forearm and flexor of elbow joint; weak flexor of shoulder joint |
| Coracobrachialis | O - Coracoid process of scapula I - Medial aspect of shaft of humerus N - Musculocutaneous nerve A - Flexes arm and alsoprocess of weak adductor |
| Brachialis | O - Front of lower half of humerus I - Coronoid process of ulna N - Musculocutaneous nerve A - Flexor of elbow joint |
| Long Head of Tricpes Brachii | O - Infraglenoid tubercle of scapula I - Olecranon process of ulna N - Radial nerve A - Extensor of elbow joint |
| Lateral Head of Triceps Brachii | O - Upper half of posterior surface of shaft of humerus I - Olecranon process of ulna N - Radial nerve A - Extensor of elbow joint |
| Medial head of Tricpes Brachii | O - Lower half of posterior surface of shaft of humerus I - Olecranon process of ulna N - Radial nerve A - Extensor of elbow joint |