Upper extremities is the medical term for the upper limbs of the body, meaning the arms and hands, including the shoulders, upper arms, forearms, and fingers.
Anatomy and structure
The upper extremities are made up of several sections. At the very top, everything begins with the shoulder girdle. This includes the collarbone and the shoulder blade. They connect the arms to the trunk and provide movement and stability. Directly below this is the upper arm. Running through the upper arm is the strong upper arm bone, known as the humerus. Further down comes the forearm, which is made up of two bones: the ulna and the radius. At the end of the chain is the hand, with its many small bones, joints, and muscles.
Each of these sections has a special job. The shoulder allows a wide range of movement. The elbow connects the upper arm and forearm and allows bending and straightening. Through the forearm run many muscles that are responsible for rotating movements and gripping. The hand is truly remarkable: it is made up of many bones, joints, and tendons that allow the finest movements as well as powerful gripping.
Function of the upper extremities
The upper limbs are essential for human life. They allow us to grip, hold, carry, and move objects. Even delicate tasks such as writing, painting, or buttoning a shirt would not be possible without the complex teamwork of muscles, tendons, and nerves.
A whole network of muscles and nerves ensures that every movement can be carried out with precision. Particularly important here is the so-called brachial plexus, a network of nerves that supplies the entire upper extremity. Injuries or conditions affecting this nerve network can lead to loss of sensation or paralysis.
What is included?
The upper extremity includes:
Each of these sections is further divided into various bones, muscles, and ligaments. The hand alone is made up of 27 bones and numerous small muscles that provide both strength and dexterity.
Common examinations
When complaints, injuries, or changes occur in the upper limbs, various examination methods are used. An X-ray is particularly common, for example in the case of broken bones or joint problems. An X-ray of the hand provides important information about bone structure, joints, and any injuries. Ultrasound, MRI, or specialist nerve measurements may also be necessary, depending on which structures are affected.
When is the term important?
The term upper extremities often appears in doctor's letters, medical reports, or findings. It is used to make clear that an examination, an injury, or a treatment relates to the arms, hands, or shoulders. For example, a report might state: "No abnormalities of the upper extremities", which means that everything was found to be in order when the arms and hands were examined. Or it might note: "Swelling of the upper extremity on the right" meaning a swelling of the right arm or right hand.
The term upper extremities is also frequently used when describing movement disorders, muscle weakness, or paralysis. In neurological or orthopaedic examinations, doctors specifically check how well movement, strength, and sensation in the arms and hands are preserved.
What is the difference from lower extremities?
In contrast to the upper limbs, the lower extremities refer to the legs, including the hip, thigh, knee, lower leg, ankle, and foot. Both areas have different roles: while the lower extremities are mainly responsible for standing, walking, and moving from place to place, the upper extremities allow targeted gripping, holding, and working.
Important terms relating to the upper extremities
Many technical terms appear in connection with the upper limbs. Some examples are:
Brachium: medical term for upper arm
Antebrachium: forearm
Manus: hand
Plexus brachialis: the large nerve network that supplies the arm and hand
Radius and ulna: the two bones of the forearm
If you are unsure what a particular term means, the context of a doctor's letter or report will usually give clues as to which part of the body is being referred to.
Summary
Upper extremities is a collective term for the arms and hands, together with all their associated structures. It is used in medicine to describe specific areas of the body clearly and precisely. Complaints, injuries, or findings in a report that refer to the upper extremities always relate to the arms, shoulders, forearms, and hands.
