Photo Researchers ftp March 2011

Atrophied seminiferous tubules. Light micrograph of atrophied (shrunk) seminiferous tubules (oval, seen in cross-section) from the testis of a 94-year...

Dysplasia in skin. Light micrograph of tissue from human skin in a case of dysplasia. Here, the normal sequence of skin cell formation and shedding ha...

Cancer cells, light micrograph. This sample shows remarkable variation in cell size and shape (cellular pleomorphism) and nuclear size and shape (nucl...

Pilonidal sinus. Light micrograph of tissue from an abscess in a case of a pilonidal sinus. This is a type of chronic abscess that forms beneath the o...

Bronchiectasis. Light micrograph of tissue from a lung in a case of bronchiectasis. This is a disorder in which the bronchi and bronchioles, the airwa...

Human skin. Light micrograph of epithelial tissue from the skin. Across top are the normal layers of stratified squamous epithelium. Across lower cent...

Blood clot, light micrograph. Thrombus (blood clot, centre) occluding an artery. The fibrous clot, which is packed full of blood cells and platelets,...

Heart tissue death. Light micrograph of a section through heart tissue 24 hours following a heart attack (myocardial infarction). An infarction is tis...

Heart tissue death. Light micrograph of a section through heart muscle tissue (myocardium) three days following a heart attack (myocardial infarction)...

Bronchopneumonia. Light micrograph of a section through lung tissue showing bronchopneumonia. This is an infection of the air spaces (alveoli) in the...

Kidney tissue death. Light micrograph of a section through kidney tissue following an infarction. An infarction is tissue death (necrosis) caused by b...

Heart attack scar. Light micrograph of a section through heart tissue showing scarring from a heart attack (myocardial infarction). An infarction is t...

Heart scarring. Light micrograph of a section through heart tissue showing scar tissue being formed about 10 days after a heart attack (myocardial inf...

Kidney hypertension, light micrograph. Section through a kidney blood vessel (round structure) with hypertrophy (enlargement) of its walls as a result...

Kidney hypertension, light micrograph. Section through a kidney blood vessel (round structure) with hypertrophy (enlargement) of its walls as a result...

Heart growth, light micrograph. Section through a thrombotic vegetation (lump, deep pink) on the endocardium of one of the mitral valves. The endocard...

Heart growth, light micrograph. Section through a thrombotic vegetation (lump, deep pink) on the endocardium of one of the mitral valves. The endocard...

Heart growth, light micrograph. Section through a vegetation (lump, deep pink, top) on the endocardium of one of the mitral valves. The endocardium is...

Aortic aneurysm. Light micrograph showing a critical haematoma (blood-filled swelling, solid wedge at top) splitting the wall of the thoracic aorta....

Nasal polyp, light micrograph. Polyps are tumors (growths) that occur on mucus membranes. Nasal polyps are removed if they turn cancerous or begin to...

Nose and throat cancer. Light micrograph of a section through throat tissue showing a nasopharyngeal carcinoma (NPC, centre). NPC is a malignant (canc...

Throat cancer. Light micrograph of a section through throat tissue showing cancerous cells that have formed small lobules (round layered structures at...

Fungal heart infection, light micrograph. Section through a vegetation (lump) on the endocardium of one of the mitral valves, showing a fungal infecti...

Twisted bowel. Light micrograph of a section through bowel tissue following volvulus, the twisting of the bowel. Here, the twisting of the intestine h...

Heart growths, light micrograph. Section through heart tissue showing thrombotic vegetations (lumps, deep pink regions at top) on the endocardium of o...

Throat cancer. Light micrograph of a section through throat tissue showing cancerous cells that have formed small lobules (dark spots at left). These...

Narrowed artery. Light micrograph of a section through an artery that is partially blocked by an atheroma (light pink, bottom). Atheroma is the deposi...

Complicated atheroma. Light micrograph of a section through an artery that is affected by a complicated atheromatous lesion. Atheroma is the depositio...

Acute appendicitis. Light micrograph through a section of an appendix showing acute appendicitis. Here, the epithelial lining of the appendix (lower e...

Acute appendicitis. Light micrograph through a section of an appendix showing acute appendicitis. Here, the epithelial lining of the appendix (running...

Celiac disease. Light micrograph of a section through the surface of a jejunum affected by celiac disease. The jejunum is the region after the duodenu...

Acute appendicitis. Light micrograph through a section of an appendix showing acute appendicitis. Here, the epithelial lining of the appendix (running...

Ulcerative colitis. Light micrograph of a section through the colon (part of the large intestine) showing colonic glands (round structures). Colonic g...

Crohn's disease. Light micrograph of a section through the lining of the colon (large intestine) of a patient with Crohn's disease, showing a fissured...

Gastric ulcer. Light micrograph of a section through a stomach with a gastric ulcer, which has perforated (torn) and destroyed the protective membrane...

Oesophageal ulcer. Light micrograph of a section through an oesophagus with a gastric ulcer on the protective membranes (mucosa) lining it. Oesophagea...

Stomach cancer. Light micrograph of a section through a stomach with adenocarcincoma (top left), a type of stomach cancer that arises from glandular t...

Stomach cancer. Light micrograph of a section through an adenocarcincoma tumour, a type of stomach cancer that arises from glandular tissue. This is t...

Stomach cancer. Light micrograph of a section through an adenocarcincoma tumour, a type of stomach cancer that arises from glandular tissue. This is t...

Celiac disease. Light micrograph of a section through a jejunum affected by celiac disease. The jejunum is the region after the duodenum at the beginn...

Acute appendicitis. Light micrograph through a section of an appendix showing early-stage acute appendicitis. Here, the epithelial lining of the appen...

Acute appendicitis. Light micrograph through a section of an appendix showing acute appendicitis with peritonitis. In appendicitis, the epithelial lin...

Gangrenous appendicitis. Light micrograph through a section of an appendix showing gangrenous appendicitis. In appendicitis, the epithelial lining of...

Crohn's disease. Light micrograph of a section through the lining of the colon (large intestine) of a patient with Crohn's disease, showing a fissured...

Crohn's disease. Light micrograph of a section through a large intestine affected by Crohn's disease, showing a granuloma (pale region). Granulomas ar...

Amoebic colitis. Light micrograph of a section through a colon (part of the large intestine) with amoebic colitis, showing an ulcer (centre). Amoebic...

Amoebic colitis. Light micrograph of a section through a colon (part of the large intestine) with amoebic colitis, showing amoebae (deep pink). Amoebi...

Crohn's disease. Light micrograph of a section through a large intestine affected by Crohn's disease, showing granulomata (pale regions, like that see...

Fibrolipid plaque. Light micrograph of a section through a fibrolipid plaque in an artery affected by a complicated atheromatous lesion. Atheroma is t...

Cancerous kidney tumour. Light micrograph of a section through a malignant (cancerous) renal neoplasm (round, centre) in the renal vein (c-shaped) of...