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Histological study on the body wall of Ascaridia galli
(Nematoda)
Zohair
I.
F. Rahemo* and Sagida S. Hussain
Department
of Biology, College of Science, University of Mosul, Mosul,
Iraq
*Corresponding author, E-mail:
zohair_rahemo@yahoo.com.
Accepted
13 October, 2009 |
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The body
wall of Ascaridia galli has been investigated using 1-2 µ
thick sections and stained with Toludin Blue. It is found to
consist of three layers, cuticle, hypodermis or subcuticle
and muscle layer. The cuticle in turn consists of three
layers namely cortex or upper layer deeply stained with TB,
1.7 µ in thickness, middle layer or matrix 3.15 µ in
thickness with no distinct constitutions, then fiber layer
which in turn consists of several layers of dense tissue,
its thickness 5.65 µ and settled on basement membrane. On
the surface of the cuticle plugs a transverse annuli which
divide the body into annuli, the distance between each two
0.22 µ each annulus is divided by three subannuli, large
anterior 0.124 µ in length and other two are small, middle
and posterior 0.047-0.054, 0.045-0.054 µ respectively. The
hypodermis or dermis is thin and not well developed and of
syncytial type and its nuclei are constricted to the
longitudinal cords that is, dorsal, ventral, and two
laterals. Mainly these nuclei are present in the lateral
cords and longitudinal excretory canals which pass through
these cords. The hypodermis become more thicker as proceed
posteriorly to reach 2 - 3 µ in thickness in the
inter-caudal region as well as thicker in the four
longitudinal cords protruded in the pseudocoel and reach the
maximum thickness near the nerve ring. In addition to these
cords there also four secondary cords which divide the
muscle groups into 8 sectors and. Moreover lateral cells in
the middle of the body are larger and more prominent
becoming pyriform clusters or cup-shaped forming lateral
hypodermal glands. The average depths of these glands are 97
µ in male and 148 µ in female. A canal or duct arises from
each gland the two canals united to open together and a
prominent cuticular pominance is seen near the opening of
these glands.
Key
words: Ascaridia galli, cuticle, nematode, layer,
cortex. |
