Upper Limb Anatomy
Upper Limb Anatomy - Related Videos
01:12
Arteries of the Upper Limbs
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2024
The subclavian artery transitions into the axillary artery as it exits the chest and enters the axillary region. This artery is critical for supplying blood to the shoulder area, including the head of the humerus, through the humeral circumflex arteries. As the vessel continues into the upper arm or brachium, it becomes the brachial artery. This artery plays a key role in vascularizing the brachial region and bifurcates at the elbow into several branches. These branches include the deep...
01:17
Veins of Upper Limbs
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2024
The human circulatory system, a marvel of biological engineering, is a complex network of vessels that transport blood throughout the body. Among these, the veins responsible for carrying blood from the upper limbs are divided into two categories: deep and superficial. The deep venous system is primarily composed of the ulnar and radial veins. The ulnar vein, which drains the fingers through the superficial palmar venous arches, and the radial vein, which serves the palms via the deep palmar...
07:24
A Method for Quantifying Upper Limb Performance in Daily Life Using Accelerometers
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Cited by 98 •
2017
This protocol describes a method to quantify upper limb performance in daily life using wrist-worn accelerometers.
01:19
Bones of the Upper Limb: Humerus
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2025
The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...
01:15
Bones of the Upper Limb: Ulna
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2025
The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side of the...
FAQs
Movement depends on linked mechanical relationships rather than isolated structures. Skeletal muscles generate force when they contract, tendons connect that force to the skeletal framework, and joints provide the articulating sites that allow segments to move. Examining these connections helps explain how the upper limb supports both broad actions, such as reaching, and controlled tasks, such as grasping.
Muscle force alone does not determine movement quality. Coordinated neural signaling helps control when and how muscles contract, while joint articulation guides the resulting motion through the shoulder, arm, forearm, wrist, and hand. Studying both systems clarifies how the upper limb produces directed, precise movements needed for manipulation rather than only generating force.
Upper Limb Anatomy connects structural organization with biological function by relating skeletal muscles, tendons, joints, nerves, and blood vessels to movement and control. This systems-based perspective shows how local structures contribute to actions involving several regions at once. It also provides a framework for interpreting how altered anatomy can affect movement, sensation-related neural control, or musculoskeletal performance.
These actions require more than a single contracting muscle. Their explanation must account for the region involved, the articulation of its joints, the force supplied by skeletal muscles, and the coordination provided by neural signaling. Considering these elements together helps distinguish the demands of reaching from the finer control required for grasping and manipulation.
Knowledge of the relationships among bones, joints, muscles, tendons, nerves, and blood vessels supports structured physical examination and assessment of injury. Clinicians can use this anatomical framework to relate observed movement problems to affected structures or connections. The same context helps evaluate nerve disorders and musculoskeletal disease without treating symptoms as isolated findings.
Anatomical relationships provide a reference for interpreting images and planning interventions involving the upper limb. They also help rehabilitation professionals understand which structures contribute to impaired movement and how function may be evaluated over time. Because the framework connects structure with movement, it supports decisions in rehabilitation, imaging interpretation, and surgical planning.