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Related Concept Videos

Radial System Protection01:23

Radial System Protection

442
Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
442
Assessment of radial pulse01:11

Assessment of radial pulse

1.5K
Assessment of Radial Pulse
The radial pulse, located at the wrist, is often the preferred site for assessing peripheral pulse because of its accessibility and dependability. The process of determining the radial pulse involves several steps:
1.5K
Muscles that Move the Head01:19

Muscles that Move the Head

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The muscles that move the head are a dynamic and complex group of structures that work together to facilitate a wide range of head movements, including rotation, flexion, extension, and lateral bending.
The bilateral sternocleidomastoid, or SCM, and the suprahyoid and infrahyoid muscles are significant head flexors. The SCM muscles originate at the sternum and clavicle and attach to the mastoid process of the temporal bone. The SCM contracts bilaterally to bend the head forward, whereas...
5.8K
Assessment of apical radial pulse01:25

Assessment of apical radial pulse

1.3K
Apical-Radial (A-R) Pulse Assessment
The A-R pulse assessment involves simultaneous evaluation of the apical and radial pulses. When the apical and radial pulse rates vary, this assessment helps identify a pulse deficit.
Pre-Procedural Preparation
1.3K
Arteries of the Head and Neck01:26

Arteries of the Head and Neck

3.2K
The human body's intricate network of arteries ensures that every organ system receives the necessary oxygen and nutrients for optimal function. The arterial network in the head and neck region is particularly complex, providing vital blood flow to the brain, eyes, and other critical structures. Prominent arteries in this region include the internal carotid arteries and the vertebral arteries.
The internal carotid arteries supply blood to the anterior portion of the cerebrum. They enter the...
3.2K
Veins of Head and Neck01:19

Veins of Head and Neck

5.5K
The blood drainage from the head and neck is primarily managed by three pairs of veins: the external jugular, internal jugular, and vertebral veins. The external jugular veins drain superficial scalp and face structures, passing over the sternocleidomastoid muscles to empty into the subclavian veins.
On the other hand, the vertebral veins, unlike their arterial counterparts, are not primarily responsible for brain drainage. Instead, they drain the cervical vertebrae, spinal cord, and some small...
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Related Experiment Video

Updated: Jan 31, 2026

Head Implants for the Neuroimaging of Awake, Head-Fixed Rats
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Isolated dislocation of the radial head.

P F Sturm, J Levine, E D Sedlin

    The Mount Sinai Journal of Medicine, New York
    |September 1, 1989
    PubMed
    Summary

    Isolated radial head dislocation without ulna fracture is rare, especially in adolescents. This study details three new cases, examining injury mechanisms and treatment delays.

    Area of Science:

    • Orthopedic Surgery
    • Pediatric Traumatology
    • Radiology

    Background:

    • Isolated radial head dislocation without associated ulnar fracture is an infrequent injury.
    • While rare in pediatric populations, documented cases exist, with only two previously reported in adolescents.
    • Understanding the specific injury patterns and outcomes in this demographic is crucial for effective management.

    Observation:

    • This report details three novel cases of isolated radial head dislocation in adolescents.
    • The cases highlight variations in the mechanism of injury leading to this specific type of dislocation.
    • Clinical presentations and initial management strategies were documented for each case.

    Findings:

    • The study expands the literature on isolated radial head dislocations in adolescents with three new case reports.

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    Isolation and Characterization of Satellite Cells from Rat Head Branchiomeric Muscles
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  • Analysis of these cases provides further insight into the biomechanics and common causes of this injury.
  • Delayed treatment in these cases revealed potential complications and challenges in management.

    • Implications:

    • Increased awareness of this rare injury in adolescents is warranted among orthopedic surgeons and emergency physicians.
    • Early diagnosis and appropriate management are essential to prevent long-term sequelae.
    • Further research into optimal treatment protocols for delayed presentations may improve patient outcomes.