Upper Limb Flashcards
What are the bones that make up the shoulder girdle?
Clavicle and scapula
Describe the clavicle: type of bone, key landmarks, articulation (makes what joint), function, muscle and ligament attachment
- Long bone, lateral end: flat, broad, sternal end: round, small
- Acromial facet on lateral end articulates with acromion of the scapula forming the acromioclavicular joint.
- Sternal facet on the sternal end articulates with clavicular notch of the manubrium of sternum forming the sternoclavicular joint. (attach to axial skeleton)
- Pushes upper limb out to the side enabling great range of motion.
- Roughening on inferior surface of lateral end provides attachment for coracoclavicular ligament.
- Roughening on inferior surface of sternal end provides attachment for costoclavicular ligament.
Describe the scapula: type of bone, key landmarks, articulation (makes what joint), function, muscle and ligament attachment
- Flat bone
- Clavicular facet on medial border of acromion articulates with acromial end of clavicle forming the acromioclavicular joint.
- Glenoid fossa on lateral end of scapula articulates with head of humerus forming the glenohumeral joint (shoulder joint).
- Stabilise bones involved in shoulder movement.
- Fossae (depressions) for muscle attachment.
Describe sternoclavicular joint: type of joint, movements allowed, ligaments attached
- saddle type synovial joint
- Elevation, depression, protraction, retraction and rotation of the shoulders.
- Sternoclavicular ligaments (anterior and posterior)
- Costoclavicular ligament (very strong, main stabilising force of the joint, resisting elevation of the pectoral girdle)
- Strong capsule
Describe acromioclavicular joint: type of joint, movements allowed, ligaments attached
- plane synovial joint
- all movements are passive, axial rotation to a degree
- Acromioclavicular ligament (covers joint capsule, reinforcing superior aspect)
- Conoid and trapezoid ligament making the coracoclavicular ligament (help stabilise joint- very strong)
- Weak capsule
Which shoulder girdle joint is commonly injured?
- Acromioclavicular joint
- Fall on outstretched hand
What are common sites of injury of the humerus?
- Surgical neck of humerus, midshaft and supracondylar
Which muscle attaches to lesser tuberosity of humerus?
- subscapularis muscle
Which muscles attaches to greater tuberosity of humerus?
- supraspinatus muscle, infraspinatus muscle, teres minor
Which muscle attaches to scapula and runs through the bicipital groove of the humerus?
- Long head of biceps brachii
Which muscle attaches to coracoid process of scapula?
- Short head of biceps brachii
Which muscles attaches to lateral epicondyle of humerus?
- extensor carpi ulnaris, extensor digitorum, extensor carpi radialis brevis, extensor digiti minimi
Which muscles attaches to medial epicondyle of humerus?
- flexor carpi radialis, flexor digitorum superficialis, flexor carpi ulnaris
What does the capitulum of the humerus articulate with?
- head of radius
What does the trochlea of the humerus articulate with?
- the trochlear notch of the ulna
What type of joint is the glenohumeral joint? What supports this unstable joint?
- Synovial ball and socket joint
- Supported by glenoid labrum, coracoaromial ligament, rotator cuff muscles, long head of biceps
What are the rotator cuff muscles of the shoulder?
- Supraspinatus, infraspinatus, teres minor, subscapularis
What is the physiological joint of the shoulder? (not true joint)
- scapulo-thoracic joint