It truly plays a huge role in the creation and design of our ecosystem. There is a ventral blood vessel ventral to the gut and overlying the ventral nerve cord.
Earthworm Anatomy And Functions
Not necessarily in that order the worm has a pointed head and a slightly rounded body.
Anatomy of a worm. Internal anatomy of earthworm. To understand a worm anatomy and physical functions it is also a good idea to understand its purpose and function in nature. The reproductive organs are suspended in the coelom and extend from the vlth to the xlxth segments.
A worm has three major duties in life eat poop and mate. These muscles contract and expand shortening and lengthening the worms body. 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. Circular muscles create the worms body rings. Worm anatomy physiology.
Beneath the ventral nerve cord is a small sub neural vessel. The annuli are covered in tiny hairs called setae which help the worms movement. 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. The body wall and the gut wall are best seen in a cross section. 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.
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. Earthworms use the prostomium to see their environment as earthworms have no eyes ears nose or hands.
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