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Related Concept Videos

Bones of the Upper Limb: Ulna01:15

Bones of the Upper Limb: Ulna

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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...
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Nerve plexuses are networks of interlacing nerves that serve as communication hubs to distribute and organize nerve action across various body regions. The nerve plexuses are organized into the cervical plexus located in the neck region, brachial plexus in the shoulder area, lumbar plexus found in the lower back, sacral plexus situated in the pelvis, and coccygeal plexus located in the coccygeal region.
The Cervical Plexus
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Bones of the Upper Limb: Radius01:09

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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.
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Diabetic Foot Ulcer01:31

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Definition A diabetic foot ulcer (DFU) is a chronic, non-healing wound that develops in individuals with diabetes. It typically occurs on pressure-bearing areas such as the heel, metatarsal heads, or hallux, and carries a high risk of infection and amputation.Pathophysiology • The development of DFUs can be explained by four interconnected mechanisms: neuropathy, ischemia, infection, and impaired wound healing. • Neuropathy is the most common factor. Sensory...
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Peripheral Arterial Disease II: Clinical Manifestations and Diagnostic Evaluation01:21

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Clinical manifestationsPeripheral Arterial Disease (PAD) manifests through a range of symptoms, from the characteristic intermittent claudication to atypical presentations and severe complications in advanced stages. Intermittent claudication, a hallmark symptom of PAD, presents as exercise-induced muscle pain that typically resolves within minutes of rest. This pain is reproducible and stems from inadequate blood flow, leading to the accumulation of lactic acid produced during anaerobic...
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Arteries of the Upper Limbs01:12

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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...
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Related Experiment Video

Updated: May 2, 2026

Screening of Axonal Degeneration in Carpal Tunnel Syndrome Using Ultrasonography and Nerve Conduction Studies
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Ulnar tunnel syndrome.

Shih-Heng Chen1, Tsu-Min Tsai1

  • 1Christine M. Kleinert Institute for Hand and Microsurgery, Louisville, Kentucky.

The Journal of Hand Surgery
|February 25, 2014
PubMed
Summary
This summary is machine-generated.

Ulnar tunnel syndrome, or ulnar neuropathy at the wrist, is challenging to diagnose due to non-specific symptoms and overlapping conditions. Advanced imaging and electrodiagnostic techniques improve diagnostic accuracy for this uncommon condition.

Keywords:
Guyon canalUlnar tunnelpisohamate hiatusulnar nerve compressionulnar neuropathy

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Area of Science:

  • Neurology
  • Orthopedics
  • Radiology

Background:

  • Ulnar tunnel syndrome, characterized by ulnar neuropathy at or distal to the wrist, is an uncommon yet documented condition.
  • Accurate diagnosis can be challenging due to nonspecific paresthesias and potential coexisting pathologies like carpal tunnel syndrome, cubital tunnel syndrome, thoracic outlet syndrome, C8-T1 radiculopathy, or peripheral neuropathy.

Purpose of the Study:

  • To provide an updated overview of ulnar tunnel syndrome.
  • To discuss the etiologies, diagnostic challenges, and treatment options for ulnar tunnel syndrome.

Main Methods:

  • Review of current literature on ulnar tunnel syndrome.
  • Discussion of diagnostic modalities including electrodiagnosis, ultrasonography, computed tomography (CT), and magnetic resonance imaging (MRI).

Main Results:

  • Advances in diagnostic tools such as electrodiagnosis, ultrasonography, CT, and MRI have enhanced the accuracy of diagnosing ulnar tunnel syndrome.
  • Differential diagnosis is complicated by overlapping symptoms with other neurological conditions.

Conclusions:

  • Ulnar tunnel syndrome diagnosis requires careful evaluation, considering potential coexisting conditions.
  • Improved diagnostic technologies aid in identifying and managing ulnar tunnel syndrome effectively.