briefing on the shoulder joint and muscle acting on the shoulder, its blood and nerve supply with related MCQ

1. Shoulder Joint
Rahul Sharma
Bpt (JMI)
MSc.Anatomy
AIIMS, Rishikesh
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2. Learning Objective
1. Shoulder joint complex
2. Shoulder joint
3. Stability factors
4. Ligaments
5. Bursae
6. Blood supply
7. Nerve supply
8. Muscle acting at shoulder joint
9. MCQ
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3. Shoulder Joint Complex
(Joints of Shoulder Girdle)
• Consist Basic 4 articulation,
1. Glenohumeral joint
2. Acromioclavicular joint
3. Sternoclavicular joint
4. Scapulothoracic linkage
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4. Shoulder joint
• Joint b/w head of humerus and glenoid cavity
of the scapula.
• Movable joint and consequently least stable.
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5. Humeral head
is 4 times the
Glenoid cavity
Glenoid cavity
too small and
shallow
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6. Ligaments of Joints
1. Capsular ligament
• Loosely attached
• Least supported inferiorly
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7. • Synovial membrane
lines inner surface of joint capsule
• Forms tubular sheath
• Communicates with subscapular and infraspinatus
bursae
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8. 3 Aperture in Joint Capsule
• Opening between tubercles of humerus.
• Opening situated anteriorly, inferior to coracoid process.
• Opening situated posteriorly
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9. 2. Glenohumeral ligaments
Superior GH ligaments
Middle GH ligaments
Inferior GH ligaments
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10. 3. Coracohumeral ligament
4. Transverse humeral ligament
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11. Accessory ligament
• Coracoacromial ligament.
• Coracoacromial arch
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12. Stability Factor’s
• Coracoacromial arch / Secondary socket
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13. • Glenoidal labrum
Deepen the glenoid fossa
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14. • Musculotendinous cuff
Supraspinatus
Infraspinatus
Tereminor
subscapular
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15. Bursae ‘s
• Subacromial bursae
• Subscapularis bursae
• Infraspinatus b.
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16. RELATIONS OF SHOULDER JOINT
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17. Arterial Supply
• Ant & Post circumflex humeral artery
• Subscapular artery
• Suprascapular artery
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18. Nerve Supply
• Axillary nerve
• Musculocutaneous nerve
• Suprascapular nerve
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19. Movements of Shoulder Joint
Movements at shoulder joint are considered
relation to scapula rather than sagittal and
coronal planes.
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20. Flexion
Extension
Adduction
Abduction
Medial &
Lateral rotation
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21. 5/2/2021 21

22. Scapulo-humeral rhythm
• 2:1 ratio
2 at gleno-humeral joint
1 at scapulo thoracic
Means if 120˚ at shoulder
joint then 60˚ occur at
scapula
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23. MCQ
Q1 . Muscle NOT inserted on greater tubercle:
a. Teres minor
b. Supra-spinatus
c. Infra-spinatus
d. Subscapularis
d. Subscapularis
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24. Q2 Mainly because of disapropriate size of articular
surface of shoulder joint make it most instable and
freely movable joint, name the arch in given
diagram?
Ans Coracoacromial arch / Secondary socket
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25. Q Name the given bursa
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26. • A 54 year old women fell down from stool . She was
feeling a severe pain on her right shoulder. She was
taken to emergency , on examination doctor observe
the female was sitting with right arm by the side of
her body and she was supporting her right shoulder
with her left hand, inspection reveal loss of round
contour , she was diagnose as a shoulder dislocation.
Q1. What is the most common type of shoulder dislocation?
Q2. why shoulder joint is commonly dislocated?
Ans1 Inferior (Commonly called as anterior dislocation by clinician)
Ans 2 because of disapropriate size of articular surface
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27. References
• Vishram Singh-Textbook of Anatomy Upper
Limb and Thorax.. Volume 1-Elsevier Health
Sciences APAC ( 2014)
• BD_Chaurasia’s_Human_Anatomy, Volume 1 -
Upper Limb Thorax, 6th Edition.
• 41st Gray's Anatomy_ The Anatomical Basis of
Clinical Practice, 41e ( PDFDrive.com )
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