Which system of the earthworm is dissected?
Dissection of Nervous System: It is located on the ventral surface except the anterior end, which is oriented vertically. Cut open the skin along the whole length of the body taking care that the nerve ring, which is dorsoventral in orientation, is not damaged.
Why are worms used for dissection?
Earthworms are ideal specimens to use for teaching basic anatomy and investigating simple organ systems. Although these annelids, or segmented worms, are one of the simpler preserved invertebrates, the digestive, circulatory, reproductive and nervous systems are well developed and easy to identify.
What is the purpose of studying and dissecting an earthworm?
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.
What is dissection hall?
Dissection Hall. A unique place where “The Dead Teaches the Living”. The Dissection hall is spacious and is fully air-conditioned with adequate light source to accommodate 100 students. There are separate rooms for embalming, cadaver storage, cold storage, cadaver preparation, bones etc.
What is the function of the clitellum in an earthworm?
… 32 and 37 is the clitellum, a slightly bulged, discoloured organ that produces a cocoon for enclosing the earthworm’s eggs. The body is tapered at both ends, with the tail end the blunter of the two. Earthworms cannot see or hear, but they are sensitive to both light and vibrations.
What does the mouth do in an earthworm?
They do not have teeth. A liplike extension over the mouth helps direct food into the mouth, where the muscular pharynx (throat) grabs it, coats it with saliva and pushes it down the esophagus into the crop, where it is stored before moving on to the gizzard.
The purpose of studying and dissecting an earthworm is to help us understand other organisms. Earthworms are organisms that are tube-shaped, segmented worms that belong to the phylum Annelida and in the species Lubricous. Earthworms decompose organic matter, break it into usable nutrients for their local ecosystems and recycle compost.
Can you dissect an earthworm?
Earthworm Dissection: Internal Anatomy. 1. Lay the worm on your dissecting tray with its dorsal side facing up. Use dissection pins to secure each end on the tray. Start your dissection about an inch posterior to the clitellum. Lift up the skin with a pair of forceps and snip an opening with a pair of dissecting scissors. Oct 22 2019
What is the anatomy of a worm?
Worm Anatomy A worms body is made up of many segments called ‘annuli’. The length of a worms body has muscles which contract and relax which enables the worm to move along a surface. Worms also have no eyes, ears or nose so they cannot see, hear or smell.