Histomorphological Study on Prenatal Development of the Lymphoid
Organs of Native Chickens of Bangladesh
M. N. Islam§, M. Z. I. Khan§*, M. R. Jahan§,
R. Fujinaga1, A. Yanai1, K. Kokubu1
and K. Shinoda1
Department of Anatomy and Histology, Faculty of Veterinary
Science, Bangladesh Agricultural University,
Mymensingh-2202, Bangladesh;
§1Division
of Neuroanatomy, Graduate School of Medicine, Yamaguchi University,
Ube, Yamaguchi 755-8505, Japan
*Corresponding author:
mzikhan1957@yahoo.co.in
Abstract
Native chickens (Gallus domesticus)of Bangladesh are scavenging in nature. Data regarding morphology of
lymphoid organs in prenatal stages are lacking. H&E staining method was
performed to study the histological development of the bursa of Fabricius,
thymus, spleen and cecal tonsil from embryonic day (ED) 10 to 20. The budding
of thymus was seen on ED 10. At ED 12, fiber network of thymus was formed to
create a basement of cells of thymus and on ED 14, these cells were begun to
organize to form cortex and medulla. But the cortex and medulla of thymus could
not be differentiated before ED 20. The plicae of bursa Fabricius started to
develop on ED 10. From ED 12 the plicae became shorter and wider to form bursal
follicles and these follicles were clearly organized into cortex and medulla on
ED 20. At ED 10, very thin capsule was seen in embryonic spleen. During ED 12,
only a few white pulps were observed, while on ED 14, purple colored white pulp
and pinkish red pulp were easily visible. At ED 20, the thickness of capsule was
increased and pulps were more distinguishable.
All the lymphoid organs showed major histological development during the later
incubation period, could indicate the immune system in that period is being
prepared to face the scavenging environment after hatching.