Human Anatomy Vol 1

Tendon of long head of biceps

brachii in tendon sheath

Coracobrachialis and short

head of biceps brachii

Pecioralis major

Latissimus dorsi

Teres major

Subscapularis

lnfraspinatus

Fig.6.5: Horizontal section of the deltoid region showing

arrangement of the muscles in and around the bicipital groove

each other on one hand, and with the capsule of the
joint on the other hand, before reaching their points of
insertion.
The cuff gives strength to the capsule of the shoulder
joint all around except inferiorly. This explains why
dislocations of the humerus occur most commonly in a
downward direction.

Subocromiol Burso

Subacromial bursa is the largest bursa of the body,

situated below the coracoacromial arch and the deltoid

SCAPULAR REGION

Origin from costal sufface

of scapula (multipennate)

Anterior circumflex

Branch to shoulder joint

Axillary vein

and artery

Axillary nerve

and its anterior

and posterior

divisions

Upper lateral

cutaneous

nerve of arm

Fig. 6.6: Horizontal section of the deltoid region showing the

nerves and vessels around the surgical neck of humerus

muscle. Below the bursa there are the tendon of the

supraspinatus and the greater tubercle of the humerus

(Fis. 6.8 ).

The subacromial bursa is of great value in the

abduction of the arm at the shoulder joint.

i. It protects the supraspinatus tendon against

friction with the acromion.

ii. During overhead abduction the greater tubercle

of the humerus passes under the acromion; this

is facilitated by the presence of this bursa.

Pseudoganglion

on the nerve to

teres minor

Posterior

circumflex

humeral artery

and vein

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Fig. 6.4: The subscapularis muscle