3) Applied Shoulder Anatomy Flashcards
Name the superficial and deep back muscles with innervation and actions
OMG I KNOW THIS! ;)
What muscles are involved in abduction of the arm?
0-15º Supraspinatus
15-90º Deltoid
90º+ (scapula rotates) Trapezius and Serratus Anterior
Name the muscles surrounding the shoulder joint. Name the rotator cuff and there attachment at the humerus. (Innervation and actions)
TOO EASY! =P
Describe the Gleno-humeral joint and give reasons for its instability
- synovial ball and socket joint
- very mobile
- shallow glenoid cavity, disproportionate articulating surfaces, lax capsule, multiplanar movements
What stabilises the Gleno-humeral joint apart from the rotator cuff?
- other muscles (deltoid, LH of biceps, LH of tri)
- ligaments (coracoacromial arch, glenohumeral, coracohumeral)
- labrum (deepens glenoid cavity) and capsule
In which direction is the shoulder most vulnerable to dislocation and why?
- inferior
- only supported by Gleno-humeral ligaments
Describe the components of the coracoacromial arch, how friction from tendon above is avoided and a possible clinical problem with it
- coracoacromial ligament
- acromion
- corocoid process
Subacromial bursa separates Supraspinatus tendon from CAA
Painful arc syndrome due to impingement of the many things that cross between the acromion and head of humerus
What is the function of the subscapular bursae?
Prevents friction between subscapularis and scapula
Describe what happens following an anterior shoulder dislocation
- humerus brought under corocoid process by action of pec major
- tear in rotator cuff, if heals poorly then possibility for recurrent dislocations
- right angle appearance as rounding effect of deltoid has moved medially
Describe the appearance of a posterior shoulder dislocation and causes
- lies between glenoid cavity and spine of scapula
- light bulb sign on x-ray
- rare, epilepsy, electric shock, hit by a van
