Specimen Nr. 06A

Specimen:

Sclera (Calf)

Staining:

Hemalaun thiacinrot

Magnification:

8x

Important structures :

1.Dense regular connective tissue of sclera
2.Portion of sclera bordering on choroid
3.External layer of sclera
Das Gewebestückchen zeigt das aus straffem faserigen Bindegewebe bestehende Skelett der äußeren Haut des Augapfels im Bereich der Sklera. Die kollagenen Fasern liegen dicht bei dicht und bilden den Hauptanteil des Gewebes. In der Übersichtsvergrößerung gelingt die Orientierung zu den angrenzenden Schichten. Der intensiv braun gefärbte schmale Streifen ist der Teil der Sklera, der an die Choroidea grenzt. Seine Braunfärbung kommt dadurch zustande, daß im Bindegewebe dieses Teils der Sklera zahlreiche Pigmentzellen vorkommen. Ihm gegenüber liegt der Abschnitt der Sklera, an dem die äußeren Augenmuskeln ansetzen.

Legende:

Dense regular connective tissue of sclera
Portion of sclera bordering on choroid
External layer of sclera

Dense fiberous connective tissue[bu]

1. Nuclei of fibrocytes
2. Cross section of fibre bundle
3. Longitudinal sliced fibre bundle

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.
Der Augapfel, bulbus oculi, hat ungefähr die Form einer Kugel. Seine Wand besteht aus drei Hauptschichten: der äußeren, mittleren und inneren Augenhaut. Die äußere Augenhaut setzt sich zusammen aus der durchsichtigen Hornhaut (Cornea), die ungefähr das vordere Sechstel des Augapfels einnimmt, und der undurchsichtigen Sklera. Die Sklera verfestigt den Bulbus und dient dem Ansatz der äußeren Augenmuskeln, die für die Augenbewegung zuständig sind.
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Magnification:

8x

Magnification:

32x

Magnifications
Dense regular connective tissue of sclera
Portion of sclera bordering on choroid
External layer of sclera

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

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