Microscopy Primer
Light and Color
Microscope Basics
Special Techniques
Digital Imaging
Confocal Microscopy
Live-Cell Imaging
Microscopy Museum
Virtual Microscopy
Web Resources
License Info
Image Use
Custom Photos
Site Info
Contact Us

The Galleries:

Photo Gallery
Silicon Zoo
Chip Shots
DNA Gallery
Amino Acids
Religion Collection
Cocktail Collection
Screen Savers
Win Wallpaper
Mac Wallpaper
Movie Gallery

Fluorescence Digital Image Gallery


Leech is a common name for over 650 species of carnivorous, bloodsucking annelid worms that make up the class Hirudinea of the phylum Annelida. They are equipped with a large and a small sucker. The mouth is located on the small sucker and has three jaws with sharp teeth that make a y-shaped incision in the flesh.

When a leech punctures the skin it anesthetizes the wound with its saliva, so that often the victim does not feel a thing. Also the leech's saliva dilates the blood vessels to increase blood flow and prevent the blood from clotting. This anticoagulant is called hirudin and has been used for medicinal purposes for centuries. Bloodletting with the aid of leeches reached its popularity in nineteenth century Europe. It was used to treat many ailments, including pain, skin disorders, and high blood pressure. A common treatment for headaches was to apply several leeches to each temple and allow them to remove the "tainted" blood. This leech craze contributed to the depletion of the European population of leeches.

Today, leeches are used after microsurgery to reduce blood congestion in damaged tissue. Often, blood can flow into the tissue but can't flow out because of swollen, blocked veins. Attaching leeches to the affected area effectively removes the old blood until the outgoing blood vessels have healed. Research is also being conducted on leech saliva for its possible anti-tumor effects.

Leeches are found most often in stagnant freshwater ponds, but can also be found on land and in saltwater habitats. They don't have gills or lungs, but breath through their skin instead. Aquatic leeches can swim, but land leeches move over solid surfaces by muscular expansion and contraction. Aquatic leeches feed on the blood of fish, amphibians, birds, mammals, snails, insect larvae, and worms. True land leeches feed only on the blood of mammals.

Leeches don't carry diseases but can cause death in extreme cases. Small, young specimens of one aquatic leech species, native to Eurasia and Africa, can parasitize both humans and animals. They enter the body either in drinking water or through the excretory openings of persons who bath in infested waters. When ingested through the mouth in drinking water, they attach themselves to the linings of the nose or throat. They can then be inhaled into the lungs, where they can cause anemia and eventually suffocation. Suffocation is a common cause of death for domestic animals in Asia. External wounds from leeches are less dangerous, but they may cause a secondary infection.

The specimen presented here was imaged with a Nikon Eclipse E600 microscope operating with fluorite and/or apochromatic objectives and vertical illuminator equipped with a mercury arc lamp. Specimens were illuminated through Nikon dichromatic filter blocks containing interference filters and a dichroic mirror and imaged with standard epi-fluorescence techniques. Specific filters for the leech specimen were a UV-2E/C, B-2E/C, and a Y-2E/C. Photomicrographs were captured with an Optronics MagnaFire digital camera system coupled to the microscope with a lens-free C-mount adapter.


Questions or comments? Send us an email.
© 1998-2022 by Michael W. Davidson and The Florida State University. All Rights Reserved. No images, graphics, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders. Use of this website means you agree to all of the Legal Terms and Conditions set forth by the owners.
This website is maintained by our
Graphics & Web Programming Team
in collaboration with Optical Microscopy at the
National High Magnetic Field Laboratory.
Last modification: Friday, Nov 13, 2015 at 02:19 PM
Access Count Since September 15, 2000: 53662
For more information on microscope manufacturers,
use the buttons below to navigate to their websites: