Shoulder joint bones Flashcards
bones and joints in the shoulder joint
scapula and humerus, glenohumeral joint
what is the humerus
a long bone, the largest in upper limb, proximal end, rounded- like a hemisphere
articulates with scapula
shaft of humerus
distal end- flattened, widened, tilted forward, 3 fossae, articulates with radius and ulna
proximal bony features of humerus
head, anatomical neck (articular surfaces meet non articular surface), greater tubercle, lesser tubercle, intertubercular sulcus (bicipital groove)- allows passage of long head of biceps
surgical neck
what is the importance of the surgical neck
area of body if you fall on outstretched hand (FOOH)- injury or fracture to this area
midshaft bony points of humerus
deltoid tuberosity- insertion of deltoid muscles spiral groove (radial)- inferior to deltoid tuberosity- indicates passage of radial nerve
distal bony points of humerus
medial and lateral supracondylar ridge, medial and lateral epicondyle, trochlea, capitulum, coronoid fossa, radial fossa, olecranon fossa
articular surfaces for glenohumeral joint
covered in hyaline cartilage, humeral head larger than glenoid fossa, glenoid labrum, surrounded by joint capsule and nourished by synovial fluid
what does the glenoid labrum do
fibrocartilaginous rim that deepens glenoid fossa
joint line of glenohumeral joint
in line anteriorly with tip of coracoid process and inferior to acromion, in concave fossa
classification of the glenohumeral joint
a synovial, multiaxial ball and socket joint with 3 degrees of motion (flex, ext, adb,add, MR, LR, circumduction
glenohumeral joint capsule
loosely surrounded has an inferior fold, strengthened by ligaments and tendons of the rotator cuff muscles, strengthened by rotator cuff muscles- supported head of humerus in shallow
glenoid and limit movements
glenohumeral joint synovial membrane
lines capsule, communicating and 3 bursae, subacromial and subdeltoid and subcoracoid bursae- prevent friction
glenohumeral joint capsular ligaments
superior, middle, inferior, transverse glenohumeral
what does the transverse glenohumeral ligament do
holds bicep tendon as it travels and wraps around the supra glenal tubercle- has synovial sheath which it moves within to prevent friction between itself and floor of bicipital groove
glenohumeral joint accessory ligaments
coracoacromial and coracohumeral ligament (from coracoid process to greater tubercle of humerus)