The Scapula
Definition
A flat triangular bone
Belongs to shoulder girdle
Situation
Lies on the posterior chest wall superficial to the ribs and separated from them by muscles
Features
At the lateral angle a shallow articular surface - glenoid cavity
It articulates with the head of humerus in the shoulder joint
Posteriorly there is an oblique ridge called spinous process
Spinous process at the lateral angle projects - acromion process
Acromion process articulates medially with the clavicle to form the acromioclavicular joint.
A projection from the upper border of the bone called coracoid process gives attachments
to muscles : coracobrachialis, short head of biceps brachii
On the dorsum : supraspinatus and infraspinatus muscels take origin
On the ventral surface : subscapularis muscle originates
The other muscles that are attached to the scapula are as in the pictures shown below
