PHTY101 Lecture Notes - Lecture 1: Glenoid Labrum, Bicipital Groove, Biceps
Document Summary
Function: positions and directs humerus, elbow and hand in relation to trunk (radioulnar. Articular surfaces: humeral head- sphere, faces medially, glenoid fossa- very shallow, faces laterally, glenoid labrum- functions, facilitate mobility, provide attachment for joint capsule, ligaments and. Orientation of fossa: faces laterally, slightly anteriorly and slightly superiorly. Articular capsule: reinforced by, rotator cuff tendons- supraspinatus, infraspinatus, teres minor, subscapularis, glenohumeral and coracohumeral ligaments (capsular) Ligaments: coracoacromial, prevents superior dislocation of humerus, coracohumeral, prevents lateral and therefore inferior dislocation of humerus, glenohumeral, superior- prevents lateral and inferior dislocation of humerus, limits external rotation, middle- limits external rotation. Inferior- prevents anterior dislocation when fully flexed/ abducted: transverse humeral, holds long head of biceps brachii in the bicipital groove, acts as retinacula. Ligaments: costoclavicular: rib 1 to clavicle, bilaminar (two layers) running at 90 degrees to one another, limits elevation of clavicle, limits protraction and retraction, anterior sternoclavicular, limits retraction, posterior sternoclavicular, limits protraction.
