Shoulder girdle
Shoulder Girdle
The Shoulder Girdle (pronunciation: /ˈʃoʊldər ˈɡɜːrdl/), also known as the pectoral girdle, is a set of bones in the appendicular skeleton which connects to the arm on each side. In humans it consists of the clavicle and scapula.
Etymology
The term "girdle" originates from the Old English word "gyrdel", which means "belt". In anatomical usage, it refers to a structure that encloses the body, similar to a belt.
Structure
The shoulder girdle includes two bones, the anterior clavicle and the posterior scapula. These bones are connected to the sternum (breastbone) and the humerus (upper arm bone), respectively, forming the pectoral girdle.
Clavicle
The clavicle, or collarbone, is a long bone that serves as a strut between the shoulder blade and the sternum. It is the only long bone in the body that lies horizontally and it forms the front part of the shoulder girdle.
Scapula
The scapula, or shoulder blade, is a large triangular bone located in the upper part of the back. It connects the humerus with the clavicle, and forms the back part of the shoulder girdle.
Function
The main function of the shoulder girdle is to provide attachment for the muscles that move the upper limbs. It also protects vital organs in the chest, such as the heart and lungs.
Related Terms
- Humerus: The bone of the upper arm or forelimb, forming joints at the shoulder and the elbow.
- Sternum: The breastbone.
- Appendicular skeleton: The portion of the skeleton of vertebrates consisting of the bones that support the appendages.
External links
- Medical encyclopedia article on Shoulder girdle
- Wikipedia's article - Shoulder girdle
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