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Limb+ Trunk
Shoulder girdle muscles and anatomical spaces
| Question | Answer |
|---|---|
| Shoulder girdle joints (3) | acromioclavicular joint sternoclavicular joint glenohumeral joint |
| acromioclavicular joint type and subtype type; subtype bony landmark ligaments muscle + movement | synovial; plane clavicle acromial/lateral end facet x scapula acromial end |
| List of anterior axioappendicular muscles | subclavian pectoral major (clavical and sternal head) pectoral minor serratus anterior |
| List of posterior axioappendicular muscles | trapezium (superior, middle, inferior) rhombus minor rhombus major latissimus dorsi |
| List of scalpulohumeral muscles | Deltoid Subscapularis Infraspinatus Supraspinatus Teres minor Teres major |
| Contributions of muscle to the rotator cuff | Teres minor Infraspinatus Supraspinatus Subscapularis muscle |
| subclavius muscle: origin; insertion nerve supply movement | 1st costal rib ; subclavian groove, clavicle superior trunk C5, C6 clavicle depression, stability |
| pectoralis major: CH, SH origin insertion action nerve supply | CH: medial half of clavicle SH: ant. sternum, superior 7 costal cartilages Lateral lip bicipital groove, humerus GH int rotation and adduction CH: humeral flex SH: humeral extension Lateral + medial (C5-T1) |
| pectoralis minor: origin insertion action nerve supply | Anterior + superior ribs 3-5 Medial coracoid process scapula drawing inferior, stability, protraction rib elevation during respiration Medial pectoral nerve C8-T1 |
| Serratus anterior origin insertion action nerve supply | Transverse ribs 1-8 or 9 and deeo fascia over intercostal space Anterior medial border of scapula Hold scapula against thoracic cage Scapula protraction, lateral rotation Long thoracic nerve C5-7 |
| Subclavius origin insertion action nerve supply | Junction of rib 1 and costal cartilage Subclavian groove of clavicle Anchors/depress clavicle Stabilize SC joint via media clavicle pull Protection of vessels in clavicle fracture Nerve to subclavius C5,6 |
| Latissimus dorsi origin insertion action nerve supply | Spinous process T7-T12, thoracolumbar fascia, inferior 3-4 ribs, iliac crest Floor, bicipital groove, humerus Humerus extension, adduction, internal rotation Thoracodorsal nerve C6-8 |
| Trapezius (S, M, I) origin insertion action nerve supply | Medial 3rd superior nuchal line, external occipital protuberance occipital bone, nuchal ligament, C7-T12 Lateral 3rd clavicle, acromion, scapula spine S: elevate, scapula upward rotation M: scapula retract I: scapula depress Accessory nerve C10 |
| Levator scapulae (under trapezium) deep to trapezius origin insertion action nerve supply | Posterior tubercle, transverse C1-4 Scapula medial supraspinal border, superior angle Scapula elevation, downward rotation Cervicle spine extension + lateral flexion Dorsal scapular nerve C4-5 |
| Rhomboid major Lies deep to trapezius but superficial to the muscles of the back Major and minor parts may not always be clearly seen (may appear like one muscle) origin insertion action nerve supply | C7-T1 infraspinal medial border Scapula retraction and downward rotation Dorsal scapular nerve C4-5 |
| Rhomboid minor Deep to trapezius but superficial to the muscles of the back Major and minor parts may not always be clearly seen (may appear like one muscle) origin insertion action nerve supply | T2-T5 supraspinal medial border, spine tip Scapula retraction and downward rotation Dorsal scapular neve C4-5 |
| Teres major origin insertion action nerve supply | Lateral border, inferior angle, scapula Medial lip, bicipital groove, humerus Humeral adduction and internal rotation Lower subscapular nerve C5-6 |
| Deltoid Multipennate muscles with three parts (A, M , S) - Attaches to the scapula and the humerus - ‘Shoulder pad’ muscle origin insertion action nerve supply | A: lateral 3rd clavicle M: cromion P: scapula spine deltoid tuberosity, humerus A: humeral flexion, int rotation M: humeral abduction P: humeral extension, ext rotation Axillary nerve C5-6 |
| Supraspinatus Most common muscle involved in ‘rotator cuff’ problems (impingement) - Initiates abduction of the humerus origin insertion action nerve supply | supraspinous fossa superior facet, greater tubercle, humerus humeral abduction 15 degrees GH stabilization suprascapular nerve C5,6 |
| Infraspinatus similar to teres minor reinforce rotator cuff capsule posteriorly origin insertion action nerve supply | infraspinous fossa middle facet, greater tubercle, humerus humeral external rotation GH stabilisation suprascapular nerve C5-6 |
| Teres minor posterior aspect of scapula, inferior to infraspinatus - Muscle of rotator cuff, reinforces capsule posteriorly - similar to infraspinatus; nerve supply is different origin insertion action nerve supply | middle lateral border, scapula superior facet, greater tubercle, humerus humeral external rotation, GH stabilization axillary nerve C5-6 |
| Subscapularis Opposition of other rotator cuff muscles origin insertion action nerve supply | Subscapular fossa Lesser tubercle, humerus Humeral rotation and adduction GH stabilization Upper and lower subscapular nerves C5 C6 |
| Anatomical spaces of shoulder region | deltopectoral triangle quadralangular space medial triangular space lateral triangular space axilla |
| Deltopectoral triangle/clavipectoral triangle boundaries countents | Clavicle Pec major clavicle head Deltoid Cephalic vein |
| Quadralangular space boundaries contents | Teres minor Humerus surgical neck Teres miajor Long head, triceps brachii Axillary nerve posterior circumflex humeral artery |
| Medial triangular space | Teres minor Teres major Long head of triceps brachii Scapular artery |
| Lateral triangular space boundaries contents | Humeral shaft Teres major Long head of triceps brachii radial nerve deep brachial artery |
Created by:
s3840330
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