Bone Anatomy - Upper Limb

Question 1

What is significant about the supra scapular notch?

Answer 1

Spanned by a transverse ligament and under passes the nerve, but over passes the vessels

Question 2

What is the radial groove continuous with?

Answer 2

The deltoid tuberosity

Question 3

Why is the shoulder highly mobile, but unstable?

Answer 3

The head of the humerus is much larger than the glenoid of the scapula

Question 4

What are the ligaments associated with the sternoclavicular joint?

Answer 4

Interclavicular, sternoclavicular (anterior) and costoclavicular ligaments

Question 5

What are the ligaments associated with the acromioclavicular joint?

Answer 5

Acromioclavicular and coracoclavicular ligaments

Question 6

What is the motion of the scapula?

Answer 6

Around vertical axis - glenoid turns anteriorly

Around horizontal axis - glenoid turns superiorly or inferiorly

Question 7

How are the movements of the scapula possible?

Answer 7

Because the scapula can slide over the posterior rib cage

Question 8

What gives the shoulder stability? (5)

Answer 8

Glenoid labrum - expands and deepens glenoid

Biceps tendon - restricts upwards motion of head of humerus

Arch of coracoid and acromion

Synovial and fibrous joint capsule membranes

Rotator cuff muscles

Question 9

Name the bursae of the shoulder and what is their function?

Answer 9

Subacromial, subdeltoid, subscapular

Fluid filled sacks reduce friction