Anatomy Of A Worm
Internal anatomy of earthworm. Earthworms use the prostomium to see their environment as earthworms have no eyes ears nose or hands.
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The reproductive organs are suspended in the coelom and extend from the vlth to the xlxth segments.
Anatomy of a worm. The first segment of the earthworm the peristomium see figure 1 contains the mouth. The intestinal walls of the worm are lined with blood vessels that are effused with blood by one of the aortic arches the earthworms five hearts. To understand a worm anatomy and physical functions it is also a good idea to understand its purpose and function in nature.
The annuli are covered in tiny hairs called setae which help the worms movement. Circular muscles create the worms body rings. The body wall and the gut wall are best seen in a cross section.
Not necessarily in that order the worm has a pointed head and a slightly rounded body. The vessels absorb and distribute nutrients from the food. The length of a worms body has muscles which contract and relax which enables the worm to move along a surface.
There is a ventral blood vessel ventral to the gut and overlying the ventral nerve cord. Within the layer of nerve tissue are cells that forward sensory information to the worms nerve cord and on to the cerebral ganglion the worms version of a brain. A worms body is made up of many segments called annuli.
There is a small tongue like lobe just above the mouth called the prostomium see figure 1. Beneath the ventral nerve cord is a small sub neural vessel. Worm anatomy physiology.
It truly plays a huge role in the creation and design of our ecosystem. A worm has three major duties in life eat poop and mate. These muscles contract and expand shortening and lengthening the worms body.
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