Scapula Anatomy

Questions and Answers

Oval plate of bone

Triangular plate of bone (correct)

Rectangular plate of bone

Circular plate of bone

It moves downwards round the chest when the arm is extended

It moves upwards round the chest when the arm is flexed

It moves backwards round the chest when the arm is adducted

It moves forwards round the chest when the arm is abducted (correct)

Infraspinatus

Supraspinatus

Deltoid

Subscapularis (correct)

Forwards, laterally and slightly upwards Signup and view all the answers

Acromion process Signup and view all the answers

Deltoid Signup and view all the answers

Finger-like Signup and view all the answers

Trapezius Signup and view all the answers

Study Notes

The lateral border of the scapula is thick and features the scapular tubercle at the upper end.
The medial border is thin and extends from the superior angle to the inferior angle.

The superior angle is covered by the trapezius muscle.
The inferior angle is covered by the latissimus dorsi muscle and moves forward around the chest when the arm is abducted.
The lateral or glenoid angle is broad and features the glenoid cavity or fossa, directed forwards, laterally, and slightly upwards.

The spine or spinous process is a triangular plate of bone with three borders and two surfaces, dividing the dorsal surface of the scapula into the supraspinous and infraspinous fossae.
The acromion process has two borders (medial and lateral), two surfaces (superior and inferior), and a facet for the clavicle.
The coracoid process is directed forwards and slightly laterally, bent, and finger-like, and is an atavistic type of epiphysis.

The subscapularis muscle arises from the medial two-thirds of the subscapular fossa.
The supraspinatus muscle arises from the medial two-thirds of the supraspinous fossa, including the upper surface of the spine.
The infraspinatus muscle arises from the medial two-thirds of the infraspinous fossa, including the lower surface of the spine.
The deltoid muscle arises from the lower border of the crest of the spine and from the lateral border of the acromion.
The trapezius muscle is inserted into the upper border of the crest of the spine and into the medial border of the acromion process.
The serratus anterior muscle is inserted along the medial border of the costal surface in three parts: one digitation from the superior angle to the root of the spine, two digitations to the medial border, and five digitations to the inferior angle.
The long head of the biceps brachii arises from the supraglenoid tubercle, and the short head from the lateral part of the tip of the coracoid process.
The coracobrachialis muscle arises from the medial part of the tip of the coracoid process.