Die stärkere Vergrößerung der Sklera zeigt den komplizierten Aufbau ihres straffen kollagenfaserigen Bindegewebes. Die dicht zusammenliegenden Fasern verlaufen sich durchflechtend in verschiedenen Richtungen, je nach auf sie wirkenden Zugspannungen. Die wenigen Fibrozyten sind nur undeutlich zu erkennen. Deutlich hingegen treten die Pigmentzellen in Erscheinung, am dichtesten in den an die Choroidea grenzenden Abschnitten.

Legende:

	Mesh-like fibre pattern of sclera
	Pigment cells of sclera

Hematoxylin and Eosin (H&E)

H&E is the most common survey stain, which shows cell nuclei and cytoplasmatic components.

Structures	Colour
Nuclei	blue
Cytoplasm	pale red
Connective-tissue fibres - Collagen - Reticular - Elastic	red - pale rose to red
Muscle tissue	red
Erythrocytes	red-orange

Dyes:

Hematoxylin

(e.g. hemalaun, Weigerts or Heidenhains iron-hematoxylin)
Hematoxylin is a positively charged dye (at low pH values). It therefore colors negatively charged (basophilic) structures blue, like the DNA of nuclear chromatin, the RNA of rough endoplasmatic reticulum, and the acidic glycosaminoglycans of hyaline cartilage.
Hematoxylin used in the preparation of iron varnish is Weigerts or Heidenhains iron-hematoxylin and in the preparation of aluminum varnish is hemalaun.

Eosin

Eosin is a negatively charged dye used for counterstaining. It stains all remaining structures different shades of red (acidophilic).

Thiazinrot

Thiazinrot behaves similar as eosin.

Straffes faseriges Bindegewebe findet sich dort, wo die mechanische Beanspruchung eines Organs oder Organteils groß ist. Fibrozyten, aber auch freie Bindegewebszellen treten gegenüber den Fasern der extrazellulären Matrix zurück. Der Stoffwechsel ist geringer als im lockeren faserigen Bindegewebe, was auch durch die geringere Zahl an Blutgefäßen zum Ausdruck kommt.

HistoNet2000 - Help

1. Organization of the screen surface

Right side: histologic specimen
Left side: information about the specimen (above) and general program functions (below)

2.Histologic specimen

Pull the mouse across the histologic specimen for training purposes. A small square with exclamation marks (dynamic labels) will appear where there is an important structure. You should then decide what structure this could be. To check your result, simply click the appropriate square, and the correct label will appear. The option “marked” allows you to see all labels for all structures simultaneously. These can be removed by clicking “unmarked”. This reactivates the dynamic labels.

3. Complementary information

Info: general information about the specimen, as well as a list of the dynamic labels
Drawing: schematic drawing of the specimen
Staining: information about the staining method for this specimen
Knowledge: short texts with basic histologic information, presently deactivated

4. General Program Functions

Home: returns you to the “start” page
Tutor: how to contact the HistoNet Team
Help: Instructions for Use appear
Exit: closes down the HistoNet program
Boxes: goes back to the other specimen of a topic
VM: provides virtual microscopy

We hope you will enjoy working with HistoNet2000 and learn a lot from it!

Specimen Nr. 06B

Specimen:

Staining:

Magnification:

Important structures :

Legende:

Hematoxylin and Eosin (H&E)

Dyes:

HistoNet2000 - Help