The upper limb is connected to the axial skeleton, which is the cranium, vertebral column, and associated thoracic cage, by the bony pectoral girdle at the sternoclavicular joint, which is the connection between the clavicle and sternum.

Each upper limb is made up of 32 bones, and has a number of different regions.

First, there’s the pectoral girdle, which consists of 2 bones: the scapula, also called the shoulder blade, and the clavicle, also known as the collarbone.

Then there’s the arm, which only has one bone, called the humerus.

Then we have the forearm, which has two bones called the radius and the ulna.

Next, there’s the wrist, which has 8 carpal bones, and finally, the hand, which has 5 metacarpal bones, and the fingers, who have 14 phalanges in total.

OK, now let’s have a look at the shoulder girdle first.

The shoulder girdle consists of the scapula and clavicle, and articulates anteriorly with the manubrium of the sternum.

Starting with the scapula, it’s a flat triangular bone located on the posterior aspect of the shoulder, extending over the second to the seventh ribs.

The scapula helps to connect the rest of the upper limb to the trunk, while stabilizing and assisting the shoulder during movement while serving as an attachment point for numerous muscles and ligaments.

Now, like any respectable triangle, the scapula has three borders; the shortest and the thinnest of them is the superior border.

Then there’s the medial border, which runs parallel to the vertebral column, and finally, there’s the lateral border which is the thickest one.