Bending your elbow and clenching your fist, are examples of flexion. It is defined as- Such movement that decreases the angle between two segments of a body part. In case of bent elbow, the angle between upper elbow and lower elbow decreases and when you clench your fist, the angle between the joints of finger decrease.
Joints which can move forward or backward, such as those in your leg and neck, flexion refers to the anterior movement. For Example, your neck flexes when you move it forward, similarly your shoulder and hip flexion refers to the forward movement of arm or leg.
Your body is made up of muscles, each helps you in performing a specific function. Flexor muscles are present throughout your body, and produce flexion.
For Example, he flexor carpus radialis, flexor carpus ulnaris, and palmaris longus muscles are long muscles that stretch from the humerus (upper arm bone) to the bones of hand, and flex the wrist. Likewise, different body parts flex due to their own flexor muscles.
Straightening your elbow or unclenching your fist, are examples of extension. It is characterized by a movement that increases the angle between two segments of a body part. In case of straightened elbow, the angle between upper arm and forearm increases, whereas when you unclench your fist, the angle between the joints of finger increase.
Those joints which can move forward or backward, such as, those located in your neck or shoulder, extension refers to the posterior (backward) movement.
Like flexor muscles, extensor muscles are present throughout the body and help you perform various tasks, such as bending the spine backwards, picking up a weight, etc. These muscles, that produce extension are referred to as Extensor Muscles.
For Example, Extensor carpi radialis longus, Extensor carpi radialis brevis, and extensor carpi ulnaris muscles, are the long muscles that stretch from humerus to the bones of hand, and extend the wrist
The Spine is the midline of body. Adduction, therefore, is characterized by the movement of a body part towards the midline of the body. For Example, if you straighten your arms at the shoulder, and bring them back to their sides, the movement will be referred to as adduction.
Similarly, bringing your legs or fingers together after spreading them wide apart, you produce adduction. Like flexor and extensor muscles, your body has adductor muscles that produce adduction.
The spine is the midline of body. Any movement, that involves a body part moving away from the midline is referred to as abduction. For Example, swinging your hand to the sides or spreading your fingers apart, moves them away from the midline.
Those muscles that produce abduction are referred to as abductor muscles.
When you rotate your body part towards the midline, the rotation is referred to as medial rotation. To understand medial rotation, bend your elbow at 90 degrees, as if you are holding a tea tray. Now rotate the arm to move it towards opposite hip, this rotational movement is called medial rotation.
When you rotate your body part away the midline, the rotation is referred to as lateral rotation. It is opposite to the movement described above in medial rotation.
It the longest bone in your body that lies horizontally. Clavicle is also known as, Collar bone. Lying between the shoulder blade and the sternum (or breastbone), clavicle act as a strut and resists compression.
Collar bone is divided into two parts, left clavicle and the right clavicle. You can easily palpate the clavicle with your hands, it is visible as a bulge, in people with lean bodies and less fat.
It is in the chest, and also referred to as breastbone. Sternum is a long flat bone that connects the ribs via cartilage and forms the rib cage, which protects your vital organs such as heat, lungs, and major blood vessels.
Understanding Arm, shoulder, elbow and
The arm consists of several segments that work together to make it one of the most useful and complex tools of the human body. These parts include
· Upper arm- Extends from the shoulder to the elbow and helps you to lift and pull
· Elbow-The joint in between the upper arm and fore-arm. It helps you to extend arm up to 180 degrees.
· Forearm-The area between the wrist and the elbow. Muscles in the forearm, rotate, flex and extend the wrist.
· Wrist-It is a complex joint that connects the hand to the forearm. It is collection of multiple bones and joints.
· Hand- It is located at the end of the forearm and consists of five fingers. You already know what it can do.