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Related Concept Videos

Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
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Angle of Twist - Elastic Range01:13

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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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.
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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.
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Cranial and Spinal Meninges01:19

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The cranial and spinal meninges are complex protective structures surrounding the central nervous system (CNS), consisting of the brain and spinal cord. These meninges consist of the dura mater, the arachnoid mater, and the pia mater. They protect the CNS, provide structural support, and aid in circulating cerebrospinal fluid (CSF).
Cranial Meninges
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Types of Fever

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Fever can be triggered by several factors, including infections, nervous system disorders, certain cancers, blood diseases like leukemia, embolism, thrombosis, heatstroke, dehydration, surgical trauma, crushing injuries, and allergic reactions.
Here are the different types of fever:
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Related Experiment Video

Updated: Jun 18, 2025

3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache
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Acute headache with a twist.

Sarah Al-Rawi1, Hiba Asad1,2, Ahmed Toma3

  • 1Paediatrics, Imperial College Health Care NHS Trust, London, UK.

British Journal of Hospital Medicine (London, England : 2005)
|July 30, 2024
PubMed
Summary

A postpartum woman experienced severe headache and vomiting. A CT venogram diagnosed hydrocephalus due to subarachnoid hemorrhage, highlighting imaging's role in postpartum neurological emergencies.

Keywords:
HeadacheHydrocephalusPostpartum periodSubarachnoid haemorrhage

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Area of Science:

  • Neurology
  • Radiology
  • Obstetrics

Background:

  • Headache and vomiting are common postpartum symptoms.
  • Subarachnoid hemorrhage (SAH) is a rare but serious complication.
  • Timely diagnosis is crucial for favorable outcomes.

Observation:

  • A 36-year-old woman presented with acute severe headache and vomiting 5 days postpartum.
  • Initial computed tomography (CT) head scan was normal.
  • Neurological deterioration prompted a CT venogram.

Findings:

  • CT venogram revealed hydrocephalus secondary to subarachnoid hemorrhage (SAH).
  • This case underscores the diagnostic utility of CT venography in suspected SAH.
  • Normal initial CT head scans do not exclude SAH.

Implications:

  • Highlights the importance of advanced imaging in diagnosing postpartum SAH.
  • Discusses risks associated with current lumbar puncture guidelines.
  • Emphasizes considering SAH in postpartum patients with severe headaches.
  • Informs differential diagnosis for postpartum headaches.