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Related Concept Videos

Muscles of the Forearm that Move the Hand and Fingers01:16

Muscles of the Forearm that Move the Hand and Fingers

The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi radialis,...
Bones of the Upper Limb: Radius01:09

Bones of the Upper Limb: Radius

The radius is longer of the two bones that make up the human antebrachium or forearm. At the proximal end, the radius articulates with the capitulum of the humerus and the radial notch of the ulna to form the elbow joint. At the distal end, the radius articulates with the ulna via the ulnar notch, forming the distal radioulnar joint. Distally, the radius also attaches to the carpal wrist bones (scaphoid and lunate) to form the radiocarpal joint.
The radius has a nail-shaped head, and a short...
Pain01:20

Pain

Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...
Arteries of the Upper Limbs01:12

Arteries of the Upper Limbs

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...
Blood and Nerve Supply to the Bones01:29

Blood and Nerve Supply to the Bones

Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
Bones of the Upper Limb: Humerus01:19

Bones of the Upper Limb: Humerus

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...

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Related Experiment Video

Updated: Jun 6, 2026

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
07:06

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury

Published on: March 21, 2025

[A man with a painful right hand].

Dennis de Witte1, Imro Dawson

  • 1IJsselland ziekenhuis, Capelle aan de IJssel, afd. Chirurgie, The Netherlands. dedewe@gmail.com

Nederlands Tijdschrift Voor Geneeskunde
|November 19, 2010
PubMed
Summary

A young man experienced a painful right hand injury, specifically a fifth carpometacarpal joint luxation and a fourth metacarpal base fracture. Both injuries were successfully treated with repositioning and a four-week plaster cast.

Area of Science:

  • Orthopedic Surgery
  • Emergency Medicine
  • Hand Trauma

Background:

  • Hand injuries are common in emergency departments, often resulting from direct impact or forceful trauma.
  • Carpometacarpal joint luxations and metacarpal fractures require prompt and accurate diagnosis and management.

Observation:

  • A young male patient presented with acute right hand pain after punching a solid surface.
  • Clinical examination revealed signs consistent with a dislocation (luxation) of the fifth carpometacarpal joint.
  • Radiographic imaging confirmed a fracture at the base of the fourth metacarpal bone.

Findings:

  • The patient sustained a combined injury of a fifth carpometacarpal joint luxation and a fourth metacarpal base fracture.
  • Non-operative management, including closed reduction (repositioning) and immobilization with a plaster bandage, was employed.

Related Experiment Videos

Last Updated: Jun 6, 2026

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
07:06

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury

Published on: March 21, 2025

  • The treatment successfully stabilized the injured bones and joint.

    • Implications:

    • This case highlights the successful non-operative management of combined carpometacarpal luxation and metacarpal fractures.
    • Prompt diagnosis and appropriate orthopedic intervention are crucial for favorable outcomes in hand trauma.
    • Understanding injury mechanisms can aid in preventing similar traumatic hand injuries.