Trachea and the upper part of the trachea (subacute Newcastle cholera – smallpox – laryngotracheitis)

Trachea and the upper part of the trachea (cholera – subacute Newcastle – smallpox – laryngotracheitis) 
Swelling of the trachea (in all respiratory diseases 
Swelling of the trachea with bleeding (influenza – bronchitis – Newcastle) 
Swelling of the larynx and trachea with false membranes (infectious laryngotracheitis) 
Mucoid swelling of the trachea with a lot of mucus (bronchitis-influenza) 
A lot of mucus in the trachea (mycoplasmosis) 
Worm in the trachea (syngamous trachea) 

the lungs 
Edema and a little blood (in birds that have been dead for a while) 
Marked and bloody edema (suffocation) 
A change in the color of the lung, tending to green or brown, containing bloody fluid (typhoid) 
Extensive pneumonia with or without hepatitis (acute cholera) 
Hepaticization of the lungs (Bastorella pseudotuberculosis) 
Abscess in the lung (pulmonary aspergillus) 

nerves 
The disappearance of the transverse lines of the nerves and their uneven thickening (mark) 
Uniform swelling of main nerves in 2 to 6-week-old chicks with a yellowish color change (VITB2 deficiency) 

bones 
Bending of bones (rickets in young patients – brosis in adults) 
The bone breaks easily with a crisp sound and does not get worse (osteobrosis-fatigue of caged hens). 
Thickening of the bones with a narrow bone marrow canal (osteopetrosis) 
Cherry red bone marrow color (erythrolecosis) 
The color of the bone marrow is light pink (carbon monoxide poisoning). 
Colorless bone marrow (bleeding syndrome – severe infection with ticks and mites – viral swelling of the liver) 
Colorless cell masses in the bone marrow (myeloid leukemia) 
Caseous seeds in bone marrow (tuberculosis) 

the brain 
Edema and bleeding in the cerebellum (encephalomalacia, lack of vitamin E – heatstroke

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