How long does it take to dissect a worm?
The dissection can be performed in about 30 minutes and requires only scissors, forceps, and dissecting pins. A hand lens may be helpful. Below is a brief survey of the internal and external anatomy of the earthworm.
What is the purpose of a earthworm dissection?
Purpose: In this lab, you will dissect an earthworm in order to observe the external and internal structures of earthworm anatomy, whilst following the all-important lab safety procedures.
Can you dissect live earthworms?
Earthworms are a great introductions to invertebrates and an easy dissection to start with. The organs and structures are so easy to see and examine. If your students are interested in animals and their anatomy at all, you can do dissections even without a curriculum!
What is the function of the openings at Segment #14?
Openings to the oviducts are found at segment 14, counting from the anterior end. These female pores release the eggs.
What is the function of the Clitellum?
animal reproduction Sexually mature oligochaetes have a clitellum, which is a modification of a section of the body wall consisting of a glandular, saddlelike thickening near the gonopores. During copulation, the clitellum secretes a mucus that keeps the worms paired while sperm are being exchanged.
What is the average number of segments on an earthworm?
100-120 segments
An earthworm has around 100-120 segments. The first segment in the body of earthworms is called peristomium or buccal segment.
What PPE is necessary for dissecting an earthworm or a squid?
Latex or nitrile gloves protect hands from contact with the specimen but also keep dirt from hands away from the earthworm. Some individuals choose to wear other protective equipment as well.
What stimuli are earthworms sensitive to?
The entire body surface of the earthworm is sensitive to the addition of sodium chloride solutions, and to touch stimulation. Adaptation to touch is rapid, but to salt is slow. The prostomial region is sensitive to these stimuli and also to sucrose, glycerol and quinine.
What part of earthworm is segment 31 to 37?
clitellum
The number of segments (the tiny ridges) in a full grown earthworm varies from 120 to 175. All segments, except the first which contains the mouth and the last which contains the anus, are similar. The outside surfaces of segments 31-37 are glandular, swollen, and smooth. This region is called the clitellum.