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Extremity – Definition, Structure and Function

An extremity is a limb of the human body -- either an arm or a leg. Extremities enable movement, grasping, and locomotion.

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Things worth knowing about "Extremity"

An extremity is a limb of the human body -- either an arm or a leg. Extremities enable movement, grasping, and locomotion.

What Is an Extremity?

In medicine and anatomy, the term extremity refers to the limbs of the human body: the upper extremities (arms) and the lower extremities (legs). They are attached to the trunk and enable a wide range of movements, from locomotion to fine motor skills such as grasping and writing.

Anatomical Structure

Upper Extremity

The upper extremity consists of the following segments:

Shoulder: connects the trunk to the arm via the shoulder joint
Upper arm: contains the humerus bone
Elbow joint: connects the upper arm and forearm
Forearm: composed of the radius and ulna bones
Hand: includes the wrist, metacarpus, and fingers

Lower Extremity

The lower extremity is divided into:

Hip: connects the pelvis to the thigh via the hip joint
Thigh: contains the femur (thighbone)
Knee joint: connects the thigh to the lower leg
Lower leg: composed of the tibia (shinbone) and fibula
Foot: includes the tarsus, metatarsus, and toes

Functions of the Extremities

The extremities serve several essential functions in the human body:

Locomotion: The lower extremities enable walking, running, jumping, and standing.
Grasping and holding: The upper extremities are used for gripping, lifting, and carrying objects.
Balance and stability: All extremities contribute to posture and balance.
Communication and expression: Hands and arms are used for gestures and nonverbal communication.

Vascular and Nerve Supply

Each extremity has a complex system of blood vessels and nerves. Arteries carry oxygenated blood into the limbs, while veins return deoxygenated blood to the heart. Nerves control the muscles (motor function) and transmit sensory information such as touch, pain, and temperature (sensory function).

Common Conditions Affecting the Extremities

Extremities can be affected by a wide range of diseases and injuries, including:

Fractures: Broken bones due to trauma or osteoporosis
Joint diseases: e.g., osteoarthritis or rheumatoid arthritis
Circulatory disorders: e.g., peripheral arterial disease (PAD)
Nerve damage: e.g., neuropathy caused by diabetes mellitus
Muscle disorders: e.g., muscular dystrophies or strains
Thrombosis: blood clots in the deep veins of the legs

Medical Examination of the Extremities

Physicians assess the extremities using various methods:

Physical examination: inspection, palpation, and assessment of range of motion
Imaging: X-ray, ultrasound, MRI, or CT scan to evaluate bones, joints, and soft tissues
Doppler ultrasonography: measurement of blood flow in vessels
Electromyography (EMG): measurement of the electrical activity of muscles
Nerve conduction studies: assessment of nerve function

References

Drake, R. L., Vogl, A. W., & Mitchell, A. W. M. (2019). Gray's Anatomy for Students. Elsevier.
Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2017). Clinically Oriented Anatomy. Wolters Kluwer.
World Health Organization (WHO): Musculoskeletal conditions. Available at: https://www.who.int/news-room/fact-sheets/detail/musculoskeletal-conditions

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