Trapezius muscle
Trapezius Muscle
The Trapezius Muscle (pronounced truh-PEE-zee-us) is a large, superficial muscle that extends longitudinally from the occipital bone to the lower thoracic vertebrae and laterally to the spine of the scapula (shoulder blade). Its functions include moving the scapulae and support for the arms.
Etymology
The term "trapezius" was first used in 1543, derived from the Greek word "trapezion" which means "a small table", due to the muscle's table-like shape when viewed from the back.
Anatomy
The trapezius muscle is divided into three parts: the superior, middle, and inferior fibers, each responsible for different movements of the scapula and cervical vertebrae.
- Superior fibers: These fibers elevate the scapula and extend the neck.
- Middle fibers: These fibers retract the scapula.
- Inferior fibers: These fibers depress the scapula.
Function
The trapezius muscle plays a crucial role in moving and stabilizing the shoulder blade. It helps in various movements like shrugging, pulling, and twisting of the shoulders. It also assists in extending the neck.
Related Terms
- Scapula: The shoulder blade.
- Cervical Vertebrae: The seven vertebrae that form the neck.
- Thoracic Vertebrae: The twelve vertebrae located in the chest area.
- Occipital Bone: The bone that forms the back part of the skull.
See Also
External links
- Medical encyclopedia article on Trapezius muscle
- Wikipedia's article - Trapezius muscle
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