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Extremities – Structure, Function & Conditions

Extremities are the limbs of the human body: the arms and legs. They enable movement, grasping, and locomotion, and are a central subject in orthopedics and surgery.

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Things worth knowing about "Extremities"

Extremities are the limbs of the human body: the arms and legs. They enable movement, grasping, and locomotion, and are a central subject in orthopedics and surgery.

What Are Extremities?

In medicine, the term extremities refers to the limbs of the human body. These include the upper extremities (arms, including the shoulder, upper arm, forearm, hand, and fingers) and the lower extremities (legs, including the hip, thigh, lower leg, foot, and toes). The extremities are connected to the trunk via girdle structures – the shoulder girdle and the pelvic girdle.

Structure of the Extremities

Upper Extremities

The upper extremities begin at the shoulder girdle, which consists of the clavicle (collarbone) and the scapula (shoulder blade). The arm itself is divided into:

Upper arm (humerus)
Forearm (radius and ulna)
Hand with the carpus, metacarpus, and fingers

The upper extremities enable fine motor skills such as grasping, writing, and tactile perception.

Lower Extremities

The lower extremities are connected to the spine via the pelvic girdle. They consist of:

Thigh (femur)
Lower leg (tibia and fibula)
Foot with the tarsus, metatarsus, and toes

The lower extremities bear body weight and enable standing, walking, running, and jumping.

Tissue Structures of the Extremities

Each extremity consists of a complex interplay of different tissue types:

Bones: provide stability and shape
Joints: allow mobility
Muscles and tendons: generate and transmit force
Ligaments: stabilize the joints
Nerves: control movement and transmit sensory signals
Blood vessels: supply tissues with oxygen and nutrients
Skin and subcutaneous tissue: protect internal structures

Common Conditions of the Extremities

The extremities can be affected by a wide range of medical conditions:

Fractures: caused by trauma or osteoporosis
Osteoarthritis: degenerative joint disease
Deep vein thrombosis (DVT): blood clots in the veins, frequently in the legs
Peripheral arterial disease (PAD): impaired blood flow to the legs
Neuropathies: nerve pain or dysfunction, e.g., in diabetes
Muscle and tendon injuries: strains, tears, or inflammation
Lymphedema: fluid accumulation due to impaired lymphatic drainage

Diagnosis of Extremity Conditions

Various diagnostic methods are available to examine the extremities:

X-ray: for evaluating bones and joints
Ultrasound (sonography): for imaging soft tissues, tendons, and vessels
Magnetic resonance imaging (MRI): detailed visualization of muscles, ligaments, and nerves
Computed tomography (CT): for complex fractures or tumors
Angiography: imaging of blood vessels
Electrophysiological studies (EMG, NCV): for assessing nerve and muscle function

Treatment Options

Treatment of extremity conditions and injuries depends on the specific diagnosis:

Conservative therapy: immobilization, physiotherapy, medication
Surgical interventions: e.g., osteosynthesis for fractures, joint replacement (endoprosthetics)
Vascular surgery: for circulatory disorders
Rehabilitation: targeted exercises to restore strength and mobility
Orthoses and prostheses: for permanent functional limitations or amputations

References

Schiebler, T. H. & Korf, H. W. (2007). Anatomie: Histologie, Entwicklungsgeschichte, makroskopische und mikroskopische Anatomie, Topographie. Steinkopff Verlag.
Niethard, F. U., Pfeil, J. & Biberthaler, P. (2014). Duale Reihe Orthopädie und Unfallchirurgie. Thieme Verlag.
World Health Organization (WHO). Musculoskeletal conditions. Retrieved from https://www.who.int/news-room/fact-sheets/detail/musculoskeletal-conditions

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