The body wall of Fasciola consists of the following parts,
It is the external covering of the body. Tegument is thick and non-ciliated structure containing mitochondria, endoplasmic strands, vacuoles and pinocytotic vesicles. This tegument layers helps the animal to overcome the digestive action of the host fluids. Also tegument bears spinules which in turn help in locomotion, protection and in anchorage of the parasite body in the bile ducts of the host.
Just under the tegument, a thin and well defined acidophilic basement membrane is present.
Fasciola has three muscle layers namely circular muscle layer, longitudinal muscle layer and diagonal muscle layer. Bothe circular and longitudinal muscles layers together are called as integumentary muscles. On the other hand diagonal muscles are present inside the longitudinal muscle layer. All these muscle fibers are smooth type. In the suckers, these muscles form a stout bundle like structure called as radial fiber which imparts radial striations to them.
This layer is of mesodermal origin. All the internal organs are embedded in it and thus it acts as a packing material between the internal organs. The mesenchyme consists of irregular uninucleate and binucleated cells with large fluid-filled intercellular spaces. Some of these cells secrete the tegument layer. Along with the skeletal function, mesenchyme also helps in transport.
- What is the importance of tegument in the bodywall of Fasciola?
- Draw a neat-labelled diagram of body wall of Fasciola.
- What is the packing material between the internal organs called? What does it consist of?
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