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Related Concept Videos

Epistaxis01:30

Epistaxis

713
Epistaxis, or nosebleeds, occurs when small, swollen blood vessels in the nasal mucous membrane rupture. Typically, the anterior septum is the primary site of occurrence.
Etiology
Possible causes of this condition include high blood pressure, trauma, low humidity, upper respiratory tract infections, allergies, foreign bodies, nasal inhalation of corticosteroids or illicit drugs, excessive use of decongestant nasal sprays, facial or nasal surgery, anatomic malformation, tumors, or systemic...
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Sutures of the Skull01:22

Sutures of the Skull

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The human skull is composed of several bones that come together to protect the brain and support the structures of the face. The junctions where these bones meet are called sutures.
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which...
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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

10.7K
The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
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Related Experiment Video

Updated: Mar 27, 2026

Lateral Fluid Percussion: Model of Traumatic Brain Injury in Mice
11:04

Lateral Fluid Percussion: Model of Traumatic Brain Injury in Mice

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[Epistaxis following skull trauma].

Roland P Nooij1, J M C Marc van Dijk, Rob J M Groen

  • 1Universitair Medisch Centrum Groningen, Universiteit Groningen.

Nederlands Tijdschrift Voor Geneeskunde
|January 7, 2016
PubMed
Summary
This summary is machine-generated.

Delayed epistaxis after head injury may signal a serious internal carotid artery (ICA) injury. Prompt diagnosis and endovascular treatment are crucial for potentially life-threatening cases.

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Area of Science:

  • Neurology
  • Vascular Surgery
  • Trauma Surgery

Background:

  • Epistaxis (nosebleed) is common, often benign.
  • However, it can indicate severe underlying conditions.
  • Post-traumatic epistaxis requires careful evaluation.

Observation:

  • A young male with head injury and fractures developed recurrent epistaxis.
  • Investigations revealed an extradural dissecting aneurysm of the internal carotid artery (ICA) into the sphenoid sinus.
  • This rare complication followed conservative treatment for craniofacial and base-of-skull fractures.

Findings:

  • Endovascular treatment, including coiling and stenting, successfully managed the ICA aneurysm.
  • The case highlights the importance of considering vascular injury in delayed post-traumatic epistaxis.
  • Diagnostic workup should include advanced imaging for suspected arterial injury.

Implications:

  • Physicians must consider internal carotid artery (ICA) trauma in delayed epistaxis post-head injury.
  • This condition is potentially life-threatening and necessitates urgent medical intervention.
  • Early recognition and endovascular management can prevent catastrophic outcomes.