The interior anatomy of a leech is divided into 32 segments, each with its own brain. Leech is an annelid. They have segments. However, unlike other annelids, the leech’s exterior and internal segmentation do not coincide. When the interior body is inspected, it is clear that the body is divided into 32 pieces or segments, each with its own brain.
These are not separate brains, but rather the same brain divided into 32 segments according to Leech’s theory. Each segment has its own neural ganglia that are connected to the next. Thus, physically, it is the same one brain that exists in 32 parts across the body.
Leeches are mostly surface dwellers in fresh water, moving above rather than through the river bed. They are particularly frequent in warm, sheltered shallow places where currents are limited and plants, stones, and detritus give protection.
Life cycle and lifespan
It generally takes about 2 weeks for the eggs to hatch into little leeches—about 5 per cocoon. They become reproductively mature in about a year. A leech can live from 2–8 years.
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Importance of leech
Leeches were employed in medicine from ancient times into the nineteenth century to collect blood from patients and to relieve fluid tensions in injured animal tissues. Leeches are employed in the treatment of joint ailments such as epicondylitis and osteoarthritis, extremity vein diseases, and microsurgery in modern times, while hirudin is utilised as an anticoagulant medication to treat blood-clotting problems.
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