Specimen Nr. 02A

Specimen:

Thymus (Human being)

Staining:

H&E

Magnification:

8x

Important structures :

1.Capsule
2.Portion of lobe
3.Lobule
4.Cortex
5.Medulla
6.Adipose tissue
Der Thymus des erwachsenen Menschen zeigt im Prinzip den gleichen Aufbau wie der kindliche Thymus, was die Gliederung in Lappen, Läppchen, Rinde und Mark angeht. Allerdings besteht der Thymus des Erwachsenen aus weniger Thymusgewebe und mehr Fettgewebe als der kindliche Thymus.

Legende:

Capsule
Portion of lobe
Lobule
Cortex
Medulla
Adipose tissue

Localisation of organs of immune-lymphatic system[we]

1. Pharyngeal tonsil
2. Palatine tonsil
3. Lymph node
4. Lymphatic vessels
5. Spleen
6. Peyer's patches
7. Thymus

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.
Das Gewicht des Thymus beträgt 27 ± 17g bei Einjährigen, 22 ± 6g bei Jugendlichen und 18 ± 5g bei 85-90jährigen. Im Laufe des Alters kommt es vor allem zu einer Abnahme der Rinde und einer Zunahme von Fettgewebe. Dieser Vorgang wird als Involution bezeichnet. Selbst in hohem Alter sind noch Reste von funktionsfähigem Rinden- und Markgewebe vorhanden.
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Magnification:

8x

Magnification:

200x

Magnifications
Capsule
Portion of lobe
Lobule
Cortex
Medulla
Adipose tissue

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!

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