Session 8 Part 2 The Shoulder Flashcards
The shoulder joint is known as and consists of
Glenohumoral joint- clavicle and scapula
Shoulder has evolved to provide
Great flexibility and mobility at the expense of stability.
The shallowness of the glenoid fossa facilitates
Motion and flexibility but also increases risk of dislocation
What strengthens shoulder joint
Glenoid labrum
Reinforcement of joint capsule of shoulder
Rotator cuffs
Inferior has no reinforcement hence weakest part
3 glenohumoral ligaments (superior, middle and inferior) on anterior (most common direction of dislocation)
What does the transverse humeral ligament do
Create a tunnel between greater and lesser tuberosities of humerus to allow long head of biceps
What does coraco-Acromial ligament do
Provides roof of subacromial space, tunnel above glenohumoral joint for Supraspinatus tendon
Prevents superior dislocation of humerus when a person falls onto outstretched hand
Extrinsic muscles of shoulder origin and insertion
Originate from torso and insert onto bones of shoulder (clavicle, scapula, humerus)
Intrinsic muscles of shoulder origin and insertion
Originate from scapula/clavicle and insert onto humerus
Extrinsic muscles of shoulder
Superficial- Trapezius and latissimus dorsi
Deep- levator scapulae, rhomboid major and minor
How to test power of trapezius muscle
Shrug shoulders whilst you attempt to push back down
Intrinsic muscles of shoulder
Scapulohumeral group
6- deltoid, teres major, 4 rotator cuff muscles (Supraspinatus, infraspinatus, Subscapularis and teres minor)
Rotator cuff muscles origin and insertion and action
Pull humeral head into glenoid fossa
Scapula to humeral head
3 muscles of anterior part of arm
BBC
Biceps brachii
Brachialis
Coracobrachialis
What is bicipital aponeurosis
Thick fascial band that forms roof of cubical fossa
