MMB [007] Shoulder joint

Question 1

Medial border of the shoulder’s fibrous capsule ?

Answer 1

-around margin of glenoid cavity ;

• beyond the labrum glenodale (so the labrum is intracapsular)

Question 2

Lateral border of the shoulder’s fibrous capsule ?

Answer 2

-around the anatomical neck of humerus

-except inferiorly where it extends as far as the surgical neck of the humerus

Question 3

The shoulder’s fibrous capsule is weak from the …. aspect

Answer 3

inferior

Question 4

The shoulder’s fibrous capsule is perforated from the …… aspect , to allow communication of the …… bursa

Answer 4

anterior ,, subscapular bursa

Question 5

The shoulder’s fibrous capsule is perforated from the …… aspect , to allow communication of the …… bursa

Answer 5

posterior ,, infraspinatus bursa

Question 6

Ligaments of the shoulder joint ?

Answer 6

1. Three gleno-humeral ligaments (are weak)
2. Coraco-humeral ligament (stronger)
3. Transverse humeral ligament

Question 7

The strongest ligament of the shoulder joint ?

Answer 7

2. Coraco-humeral ligament (stronger)

Question 8

Weak ligaments of the shoulder joint ?

Answer 8

1. Three gleno-humeral ligaments (are weak)

Question 9

Name the ligaments and mention their function in the shoulder stability

Answer 9

• Three Glenohumeral ligaments; prevent excessive lateral rotation of shoulder

Question 10

Name the ligament in red and mention it’s function in the shoulder stability

Answer 10

• Coracohumeral ligament; (prevents excessive lateral rotation of shoulder)

Question 11

Name the ligament and mention it’s function in the shoulder stability

Answer 11

• prevents any upward displacement of the shoulder joint

Question 12

Answer 12

Question 13

The three Factors increasing stability of the shoulder joint ?

Answer 13

1) Muscular Factor

2) Bony factor

3) Shoulder joint ligaments

Question 14

The Muscular Factor in shoulder stability ?

Answer 14

-rotator cuff muscles

• Long head of biceps; supports the joint from above
• Long head of triceps; supports the joint from below during abduction (weakest)

Question 15

The Bony Factor in shoulder stability ?

Answer 15

• Coraco-Acromial arch ; it provides a secondary socket above the joint to resist upward displacement of head of humerus

Question 16

Major Inferior relations of the shoulder joint ?

Answer 16

-Axillary Nerve

• Humeral circumflex arteries

Question 17

Complications associated with inferior humeral dislocation ?

Answer 17

-traumatizes the axillary nerve leading to paralysis of deltoid muscle ;

-with inability to abduct the shoulder from 15° to 90°

Question 18

Nerve supply of Serratus anterior muscle ? And it’s root value

Answer 18

Long thoracic nerve ; (C 5, 6, 7)