Shoulder Joint

Question 1

Where can the coracoid process be felt?

Answer 1

The coracoid process can be felt 2 cm inferior to the junction between the middle and lateral thirds of the clavicle.

Question 2

Which muscles are responsible for shoulder joint abduction?

Answer 2

• Supraspinatus (0-15ᵒ)
• Deltoid (middle fibres) (15-90ᵒ)
• Trapezius and serratus anterior (over 90ᵒ), which will require upward rotation of the scapula with lateral rotation of the humerus.

Question 3

What are the muscles attached to the coracoid process?

Answer 3

• Pectoralis minor (insertion)
• Coracobrachialis (origin)
• Short head of biceps (origin)

Question 4

What are the ligaments attached to the coracoid process are:

Answer 4

• Coracoclavicular (trapezoid, conoid)
• Coracoacromial
• Coracohumeral

Question 5

What are the muscles inserted in the bicipital groove?

Answer 5

“A lady between two majors”

• The muscles inserted in the bicipital groove are:
  
  • Teres major (medial lip)
  • Latissimus dorsi (floor)
  • Pectoralis major (lateral lip)
• The tendon of the long head of biceps lies in the groove.

Question 6

What factors decrease the stability of the shoulder joint?

Answer 6

• Shallow glenoid cavity
• Lax capsule with few ligaments
• Inferior aspect is not supported due to the presence of quadrangular space.

Question 6

What is the main stabilizer of the shoulder joint?

Answer 6

The rotator cuff muscles.