1.Origin, Insertion, Action, Innervation and Blood Supply. 2. Bursae in shoulder joint 3. Muscles of shoulder 4. Clavicle, scapula and humerus

1. Muscle of
Shoulder
( Clavicle, Scapula &
Humerus )
1

2. a. Muscles of pectoral girdle
b. Muscles associated with
scapula
c. Muscles of the
anterior/posterior
compartment of arm 2

3. a. Muscles of pectoral girdle
1. Trapezius 2. Infraspinatus
3. Deltoid 4. Teres
Minor
5. Latissimus Dorsi 6. Teres
Major
7. Pectoralis Major 8.
Subscapularis 3

4. 1.Trapezius
4
Origin:
Upper part:
• External occipital proturberance,
• Medial third of the superior nuchal line
• The ligamentum nuchae,
• The spinous process of C7
Medial Part: Spinous processes of T1 to T5.
Lower Part: Spinous processes of T6 to T12
Insertion:
Upper Part:
• Lateral third of the clavicle
• The medial aspect of the acromion process of the scapula
Middle Part:
• Medial edge of the superior surface of the acromion process of the
scapula
• The superior edge of the scapular spine
Lower Part: Tubercles of the apex of the scapular spine
Action:
• Elevation , depression, rotation, adduction of scapula
Innervation: Cranial nerve 11 , Cervical nerve C2-C4
Blood Supply: Branches from the thyrocervical trunk.

5. 2. Deltoid
5
Origin:
Anterior Part (Clavicular): Anterior border of the lateral third of
the clavicle
Medial Part (Acromial) : Lateral border of the acromion of the
scapula
Posterior Part (Spinal) : Inferior edge of the scapular spine
Insertion:
(Clavicular): The deltoid tuberosity on the lateral surface of the
proximal humeral shaft
(Acromial): The deltoid tuberosity on the lateral surface of the
proximal humeral shaft.
(Spinal): The deltoid tuberosity on the lateral surface of the
proximal humeral shaft.
Action:
• (Clavicular) : Anteversion, internal rotation, adduction
• (Acromial) : Abduction
• (Spinal) : Retroversion, external rotation, adduction
Innervation: Axillary nerve (C5, C6)
Blood Supply: Cephalic vein

6. 3. Latissimus Dorsi
6
Origin:
• Spinous processes of T7-T12
• Ribs 9-12
• Iliac Crest
• Inferior angle of scapula
Insertion: Intertubercular groove of humerus
Action:
• Extension arm
• Adduction arm
• Rotation arm
Innervation: Thoracodorsal nerve (C6 – C8)
Blood Supply: Thoracordosal Artery from the
axillary artery

7. 4. Pectoralis Major
7
Origin:
• Clavicular part
• Sternocostal part
• Abdominal part
Insertion: Greater Tubercle
Action: Adduction, Anteversion, Rotation, Retroversion
Innervation:
• Medial pectoral nerve (C7, T1)
• Lateral pectoral nerve (C5, C6, C7)
Blood Supply: Pectoral branches from the thoraco-acromial
artery

8. 5. Supraspinatus
8
Origin: Supraspinous fossa of scapula
Insertion: Superior facet of greater tubercle of
humerus
Action:
• Abduction of arm
• Stabilizes humerus
Innervation: Suprascapular nerve (C5,C6)
Blood Supply:
• Suprascapular artery from the thyrocervical
trunk
• Dorsal scapular artery

9. 6. Infraspinatus
9
Origin: Infraspinous fossa of the scapula
Insertion: Middle facet of greater tubercle of the
humerus
Action:
• Rotation of arm
• Stabilizes humerus
Innervation: Suprascapular Nerve (C5, 6)
Blood Supply:
• Suprascapular Artery
• Circumflex humeral artery from the axillary artery.

10. 7.Teres Minor
10
Origin: On the dorsal surface of the middle half
of the lateral border of the scapula
Insertion: The lowest of the three facets of the
greater tubercle of the humerus
Action: Externally rotates the arm
Innervation: Axillary nerve (C5,6)
Blood Supply: Scapular circumflex artery

11. 8.Teres Major
11
Origin: Posterior aspect of the inferior angle
of the scapula
Insertion: Medial lip of the intertubercular
sulcus of the humerus
Action: Internal rotation (medial rotation) of
the humerus
Innervation: Lower subscapular nerve (C5,6)
Blood Supply: Subscapular and posterior
circumflex humeral arteries from the axillary
artery

12. 9. Subscapularis
12
Origin: Medial two-thirds of volar surface of the
scapula
Insertion: Lesser tubercle of humerus
Action:
• Internally rotates humerus
• Assists with depression of the humeral head
Innervation: Upper and Lower Subscapular Nerve
(C5,6)
Blood Supply: Subscapular artery from the axillary
artery

13. 10. Subclavius
13
Origin: From the junction of the first rib and its
costal cartilage, just anterior to the
costoclavicular ligament
Insertion: By muscular fibers to the groove on
the inferior surface of the middle of the clavicle
Action: Depression of clavicle
Innervation: Subclavian branch of brachial plexus
(C5, C6)
Blood Supply: Clavicular branch from the
thoraco-acromial artery and the suprascapular
artery

14. b. Muscles associated with
scapula
14
1.Levator Scapula
2.Rhomboid Minor
3.Rhomboid Major

15. 1. Levator Scapula
15
Origin: Transverse processes of C1-C4
Insertion: Vertebral border of scapula
Action:
• Elevates scapula
• Downwardly rotates scapula
Innervation:
• Anterior primary rami of (C3 and C4)
• Dorsal scapular nerve (C5)
Blood supply: Dorsal Scapular Artery

16. 2. Rhomboid Minor
16
Origin: Ligamentum Nuchae and the spinous
processes of C7 and T1
Insertion:
• Vertebral border of the scapula,
• Adjacent to the scapular spine.
Action:
• Retraction of the scapula
• Downward rotation of the scapula
Innervation: Dorsal scapular nerve C5
Blood Supply: Dorsal scapular artery

17. 3. Rhomboid Major
17
Origin: Spinous processes of T2 – T5
Insertion:
• Vertebral border of the scapula
• From inferior to the scapular spine
to the inferior angle
Action:
• Retraction of the scapula
• Downward rotation of the scapula
Innervation: Dorsal scapular nerve C5
Blood Supply: Dorsal scapular artery

18. c. Muscles of the
anterior/posterior
compartment of arm
18
1.Biceps Brachii
2.Brachialis
3.Coracobrachialis
4.Triceps Brachii

19. 1. Biceps Brachii
19
Origin:
• Supraglenoid tubercle of scapula
• Coracoid process of scapula
Insertion: Radial tuberosity of radius
Action:
• Flexes forearm at elbow
• Supinates forearm
Innervation: Musculocutaneous nerve (C5,6)
Blood Supply: Muscular branches of the
brachial artery

20. 2. Brachialis
20
Origin: Anterior Humerus
Insertion: Coronoid Process of Ulna
Action: Flexes forearm at elbow
Innervation: Musculocutaneous nerve (C5,6)
Blood Supply:
• Muscular branches from the brachial
artery
• Radial recurrent artery from the radial
artery.

21. 3. Coracobrachialis
21
Origin: Coracoid process of scapula
Insertion: Medial humerus
Action:
• Flexes arm at shoulder
• Adducts arm
Innervation: Musculocutaneous
nerve (C5,6,7)
Blood Supply: Muscular branches
from the brachial artery

22. 4.Triceps Brachii
22
Origin:
• Long head: Infraglenoid tubercle of
scapula
• Lateral head: Posterior humerus
• Lateral head: Posterior humerus
Insertion: Olecranon process of ulna
Action: Extends forearm at elbow
Innervation: Radial nerve (C6,7)
Blood supply:
• Muscular branches
• Superior ulnar collateral
• Profunda brachii arteries from the
brachial artery.

23. 23

24. 24

25. 25

26. 26