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California Day

 

 

 

 

 

 

Louis-Antoine Ranvier

 

 Louis-Antoine Ranvier (1835–1922) was a French physician, anatomist, and histologist. He worked during a period when microscopy was transforming biology and medicine.

 

                                       

             

 

 

 Louis-Antoine Ranvier To Nodes Of Ranvier  

 

 

Nodes of Ranvier (1878)

His most famous discovery was the identification of periodic gaps in the myelin sheath of nerve fibers.

Key observations:

• Myelin is segmented, not continuous

• Gaps occur at regular intervals

• These interruptions later proved essential for saltatory conduction

   
  
  Node Of Ranvier On Electron Microscopy

   

   

   

  Working Of Nodes Of Ranvier  

   

   

  Action Potential Occurs At The Node Of Ranvier  

   

   

   

   

   

   

  
  

  Action Potential Of Neuron 

   

   

   

   

   

   

   

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World Thinking Day

 

 

 

Alexander Luria in the mid-20th century. Luria reframed the frontal lobes not as a single “thinking center,” but as systems responsible for:

• goal formation

• planning and sequencing

• regulation of behavior

• monitoring outcomes

He described the frontal lobes as crucial for the organization of thought, rather than thought content itself.

 

 

 

 

 

 

 

 

 

 

Quotes On Thinking 

 

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Japanese Lung Fluke

 

In 1878, the adult fluke was described by: Coenraad Kerbert

Kerbert discovered the organism in the lungs of a Bengal tiger in a zoo. Initially, it was simply a zoological curiosity rather than a recognized human pathogen. 

 

 

 

Parasitic Food-Borne Zoonoses 

 

 

 

 

Cerebral Paragonimiasis

 

Cerebral paragonimiasis is a neurological manifestation of infection by lung flukes of the genus Paragonimus, most commonly Paragonimus westermani. 

 

 

 

 

 

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