Battalion. A battalion is a military unit with 300 to 1,200 soldiers that usually conists of two to seven companies and is commanded by either a lieutenant colonel or a colonel. Several battalions form a regiment or brigade.
When a joint can move forward and backward, such as the neck and trunk, flexion refers to movement in the anterior direction. Flexion of the shoulder or hip refers to movement of the arm or leg forward. Extension is the opposite of flexion, describing a straightening movement that increases the angle between body parts.When a joint can move forward and backward, such as the neck and trunk, extension refers to movement in the posterior direction.For example, when standing up, the knees are extended.ee also: List of flexors of the human body and List of extensors of the human body. Flexion and extension describe movements that affect the angle between two parts of the body. These terms come from the Latin words with the same meaning.
In the videos above, shoulder flexion is the action of raising the arm above the head. Extension is then the downward movement. In the photo, the shoulder is in an extended position. For the knee, bending the knee is flexion, as the angle is reduced (as shown in the picture) and straightening it is called extension.