2 Avian RBC maturation-The younger cells are smaller, rounder and have a more basophilic cytoplasm. Mature erythrocytes are oval with eosinophilic cytoplasm. The nuclear size decreases and the amount of cytoplasm increases as the cell matures.Polychromatic (younger) RBCsMature erythrocytesBasophilic (even younger) erythroblast
3 This is a very young red blood cell or basophilic erythroblast This is a very young red blood cell or basophilic erythroblast. Also present are some polychromatic and mature erythrocytes.Polychromatic erythrocytesBasophilic erythroblastMature erythrocytes
4 There is a definite increase in the number of young RBCs in this field There is a definite increase in the number of young RBCs in this field. This would indicate regenerative anemia. The body is producing more red blood cells to replace a loss. If the number of RBCs falls below the normal range it could be due to blood loss or perhaps RBC destruction.
5 RBC with no nucleus (anucleated) Here you see an anucleated RBC. The presence of a small number of these cells has no pathological significance. Also note the smudged RBC. Red blood cells are very fragile and are often damaged when the slide is made.RBC with no nucleus (anucleated)Smudged RBC
6 These are typical avian white blood cells These are typical avian white blood cells. The heterophil (on the right) is round with round red granules in the clear cytoplasm. The eosinophil is also round with a blue-gray cytoplasm and stains more noticeably than the heterophil.EosinophilHeterophil
8 This is an example of a heterophil that is broken, revealing rod-shaped, red granules.
9 This is an example of a basophil This is an example of a basophil. The cell is round and contains a nucleus that is light blue in color. It has a large number of deeply basophilic-staining granules that almost cover the nucleus.
10 This field contains a heterophil (at top) and a lymphocyte This field contains a heterophil (at top) and a lymphocyte. The heterophil has rod-shaped granules. The lymphocyte is molded around the adjacent cells. There is a high nuclear to cytoplasmic ratio in the lymphocyte.
11 This is an example of a lymphocyte that has irregular cytoplasmic projections, known as blebs.