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