CHAPTER -4

SCAPULAR AND DELTOID REGIONS

This part has following muscles

Deltoid muscle

Supra spinatus

Infra spinatus

Teres minor

Teres major

DELTOID:

Called so as it resembles the inverted delta shape,

Origin: (Opposite to the insertion of trapezius)

From anterior border and upper surface of lateral one third of clavicle.

From the lower lip of the crest of the spine of scapula

From the lateral border of acromion

Insertion : Deltoid tuberosity of humerus

Nerve supply : Axillary nerve : (C5, C6)

Actions 

Middle fibres  - powerful abductor of shoulder joint

Anterior fibres – act with pectoralis major

Posterior fibres – extension, adduction and lateral rotation of shoulder joint


CAN YOU IDENTIFY THE LABELLED MUSCLES?

SUPRASPINATUS:

Origin: from supra spinous fossa of scapula and the overlying deep fascia.

Insertion: Passes beneath the coracoacromial arch to insert into the upper part of greater tubercle of humerus.

Nerve supply: Supra scapular nerve ( C5,C6)

Actions : Initial abduction of the shoulder joint up to 150

(Note : this initial abduction is needed in many activities of upper limb as in writing and drawing).

FOR COMPLETE OSTEOLOGY OF SCAPULA, WATCH THIS VIDEO:

https://youtu.be/apMglf2oYO8


Muscle

Origin

Insertion

Nerve supply and actions

Infra spinatus

Infraspinous fossa of scapula

Middle part of greater tubercle of humerus

Supra scapular nerve

Lateral rotator of shoulder joint

Teres minor

Lateral border of scapula

Lower part of greater tubercle of humerus

Axillary nerve

Lateral rotator

Teres major

Lateral border of scapula

Medial lip of inter tubercular sulcus

Lower subscapular nerve

Lateral rotator of humerus

 

INTERMUSCULAR SPACES:

Quadrangular space

Upper triangular space

Lower triangular space

Quadrangular space :

Above – teres minor

Below  - teres major

Medially – long head of triceps

Laterally – surgical neck of humerus

Contents:

Axillary nerve

Posterior circumflex humeral vessels.

FOR INTERMUSCULAR SPACES OF SCAPULAR REGION, WATCH THIS VIDEO:  https://youtu.be/PdMd2AR4sko

 Upper triangular space

Above – teres minor

Below : teres major

Laterally – long head of triceps ( base of triangle)

Apex – lateral border of scapula

Contents:

Circumflex scapular vessels

Lower triangular space

Above – teres major

Medially – long head of triceps

Laterally – surgical neck of humerus

Contents:

Radial nerve

Profunda brachii vessels

FOR DISSECRION OF INTERMUSCULAR SPACES OF SCAPULAR REGION, WATCH THIS VIDEO: https://youtu.be/3mJA-LkRerw

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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