Superior angle of scapula
The superior angle (of the scapula) is a structural feature on the scapula bone (also known as the shoulder blade or shoulder bone).
The superior angle of the scapula is also known as the medial angle of the scapula.
As can be seen from the photograph of the model of a scapula bone (part of a model of the human skeleton) on the right, the scapula bone is approximately trianglular. It is described as a 'flat, triangular bone' so one would expect it to have three 'angles'. They are:
- the superior angle of the scapula, as described on this page
- the inferior angle of the scapula, and
- the anterior angle of the scapula (also known as the lateral angle of the scapula), which forms the 'head of the scapula' including an articulatory surface called the glenoid cavity that articulates with the head of humerus (upper-arm bone), forming the shoulder joint.
These three "angles" of the scapula are apparent from the two diagrams below and on the diagram of the 3 angles of the scapula bone.
The superior angle of the scapula bone is located at the point on the upper surface of the scapula where the vertebral border, which is also called the "medial border" (of the scapula) meets the superior border (of the scapula). It is a thin, smooth, rounded angle that is slightly inclined laterally i.e. towards the sides right/left of the body rather than inwards towards the vertebral column.
The superior angle of the scapula forms the point of insertion of the levator scapula (muscle, pl. levator scapulae) whose functions, or 'actions' include a combination of raising the the scapula and / or rotating the head and / or tilting the head to the side.
More about bones and features on bones:
- Structures and functions of bones (an overview about the skeletal system)
- Types of bones, such as long bones, short bones, flat bones, etc.
- Bone markings and features on bones of the human body
- Types of joints, such as immoveable, slightly moveable and freely moveable joints
- Diagram of the human skeleton
- Overview of types of conditions and disorders of the skeletal system
For further information see also books about orthopaedics.