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Scapula + Shoulder
| Question | Answer |
|---|---|
| What kind of joint is the sternoclavicular joint? | Atypical synovial joint |
| What lies between sternum and clavicle at the sternoclavicular joint? | Fibrocartilage disc |
| What stabilises the sternoclavicular joint? | Costoclavicular ligament |
| How many heads does deltoid have? | 3 heads |
| What is the origin of the clavicular head of deltoid? | Anterior aspect of clavicle |
| What is the origin of the acromial head of deltoid | Acromion of scapula |
| What is the origin of the spinal head of deltoid | Posterior spine of scapula |
| Where does deltoid insert? | Deltoid tuebrosity of humerus |
| What innervates deltoid? | Axillary nerve |
| What are the four rotator cuff muscles? | Supraspinatus, Infraspinatus, Teres minor and Subscapularis - SITS |
| What is the purpose of the rotator cuffs? | Stabilising the shoulder joint |
| What is the origin of supraspinatus? | Supraspinous fossa of scapula |
| What is the insertion of supraspinatus? | Greater tubercle of humerus |
| What is the function of suprspinatus? | Abduction of shoulder until 15 degrees and stabilising shoulder |
| What innervates supraspinatus? | Subscapular nerve |
| What is the origin of infraspinatus? | Infraspinous fossa |
| What is the insertion of infraspinatus? | Greater tubercle of humerus |
| What is the function of infraspinatus? | External rotation of shoulder and stabilisation of shoulder |
| What innervates infraspinatus? | Subscapular nerve |
| What is the origin of teres minor? | Lateral border of scapula |
| What is the insertion of teres minor? | Greater tubercle of humerus |
| What is the function of teres minor? | Arm adduction and external rotation of arm and stabilisation of shoulder joint |
| What innervates teres minor? | Axillary nerve |
| What is the origin of subscapularis? | Subscapular fossa |
| What is the insertion of subscapularis? | Lesser tubercle of humerus |
| What is the action of subscapularis? | Internal rotation of arm and stabilisation of shoulder joint |
| What innervates subscapularis? | Upper and lower subscapular nerves |
| What is the glenoid labrum? | Fibrocartilaginous ring around glenoid fossa |
| What muscles protract the scapula? | Pec minor and serratus anterior |
| Which muscles retract the scapula? | Rhomboids, Middle trap and latissimus dorsi |
| What muscles flex the shoulder? | Front delt, Clavicular head of pec major, Some coracobrachialis and biceps |
| What muscles extend the shoulder? | Latissimus dorsi, rear delt, some teres major and triceps |
| What muscles adduct the shoulder? | Sternal head of pec major, latissimus dorsi and teres major |
| What muscles abduct the shoulder? | Supraspinatus at 15 degrees and middle delt beyond that |
| What muscles medially rotate the shoulder? | Subscapularis, teres major and pec major |
| What muscles laterally rotate the shoulder? | Infraspinatus, teres minor and rear delt |
Created by:
Birubu