The latissimus dorsi muscles* are broad superficial muscles that extend across much of the back and around the sides of the upper-torso.
Origin, Insertion and Actions of the Latissimus dorsi muscles:
|Points of Origin:||
|Point of Insertion:||
* Although the wide expanse of latissimus dorsi muscle is sometimes referred to in the singluar form (i.e. as one muscle) in general descriptions, it is actually two muscles - one on each side of the right- and left- sides of the body. That distinction is clear from the above information about the origin, insertion and actions of the latissimus dorsi muscles.
For example, the point of insertion of the latissimus dorsi muscle on the right-side of the body is on the right humerus bone and its actions include adducting the right arm. In the same way, the points of origin of the latissimus dorsi muscle on the left-side of the body include locations on the lowest 3 or 4 ribs on the left-side of the body and the actions of that (left) latissimus dorsi muscle include adducting the left arm.
More about Muscles:
The following are some popular pages in the section about the human muscular system:
- The structure of muscle tissue
- The structure of muscle cells
- Labelled diagrams of the muscles in different parts of the body including anterior muscles, posterior muscles and facial muscles
- Types of muscle contractions
- Movements at joints
There are also more pages about the words used to describe muscles (terminology), the anatomy and physiology of muscles, muscular disorders and associated topics. See also books about sports medicine.
- Anterior Muscles
- Posterior Muscles
- Facial Muscles
- Muscle Terminology (Definitions)
- 1. Structure of Muscle
- 2. Structure of Muscle Cells
- 3. Muscle Filaments
- 4. Sliding Filament Theory
- 5. Neuromuscular Junction
- 6. Actions at Neuromuscular Junction
- Types of Muscle Contractions
- Muscular Disorders
- Effects of exercise on muscles