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    Earthworm Dissection

    Uploaded by

    JJ Almagro
    1) The document provides a 7-step guide to dissecting an earthworm. It instructs how to euthanize the worm, lay it out on a tray, make a shallow cut behind the clitellum, continue cutting the skin towards the head using scissors, sever the septum walls, pin the skin flaps, and identify the internal organs. 2) Key steps include euthanizing the worm in alcohol, pinning it dorsal side up on a tray, making a shallow cut behind the clitellum to open the skin without puncturing intestines, cutting and pinning the skin flaps to expose the internal organs for identification and study.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Earthworm Dissection

    Uploaded by

    JJ Almagro
    182 views4 pages
    1) The document provides a 7-step guide to dissecting an earthworm. It instructs how to euthanize the worm, lay it out on a tray, make a shallow cut behind the clitellum, continue cutting the skin towards the head using scissors, sever the septum walls, pin the skin flaps, and identify the internal organs. 2) Key steps include euthanizing the worm in alcohol, pinning it dorsal side up on a tray, making a shallow cut behind the clitellum to open the skin without puncturing intestines, cutting and pinning the skin flaps to expose the internal organs for identification and study.

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    1) The document provides a 7-step guide to dissecting an earthworm. It instructs how to euthanize the worm, lay it out on a tray, make a shallow cut behind the clitellum, continue cutting the skin towards the head using scissors, sever the septum walls, pin the skin flaps, and identify the internal organs. 2) Key steps include euthanizing the worm in alcohol, pinning it dorsal side up on a tray, making a shallow cut behind the clitellum to open the skin without puncturing intestines, cutting and pinning the skin flaps to expose the internal organs for identification and study.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    182 views4 pages

    Earthworm Dissection

    Uploaded by

    JJ Almagro
    1) The document provides a 7-step guide to dissecting an earthworm. It instructs how to euthanize the worm, lay it out on a tray, make a shallow cut behind the clitellum, continue cutting the skin towards the head using scissors, sever the septum walls, pin the skin flaps, and identify the internal organs. 2) Key steps include euthanizing the worm in alcohol, pinning it dorsal side up on a tray, making a shallow cut behind the clitellum to open the skin without puncturing intestines, cutting and pinning the skin flaps to expose the internal organs for identification and study.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    Guide to the Dissection of an Earthworm

    1) To euthanize your earthworm, place it inside a small


    glass jar with a cotton balls heavily soaked with 70%
    alcohol. Cover the jar and wait for the worm to stop
    moving.

    2) Lay the worm on the dissecting tray with its dorsal


    side facing up (dorsal side is darker in color). Stretch
    the worm enough to steady the body across the tray
    before securing the head end and posterior end with
    pins.

    3) Using your scalpel, start with a small (up to 1 cm)


    dissection posterior/behind the clitellum, cutting
    towards the tail (if your specimen does not have a
    visible clitellum, start 1 inch below the head). Go
    slowly and make it shallow enough to cut just the
    skin (if you go too deep, you will puncture the
    intestines, indicated by a blackish discharge).

    4) Insert the tips of small dissecting scissors into the


    opening and continue cutting the skin towards the
    head end. Again, make sure to ONLY CUT THE SKIN.

    5) Using your forceps, carefully pull apart one side of


    the flap of skin. Carefully drag a pin along the inside
    of the skin to sever the septum walls to make it
    easier to spread the skin. Repeat the same on the
    other flap of skin.

    6) Once the septum walls are severed, pin the skin flaps
    on the tray. Pin it diagonally.

    7) Identify and study the internal organs


    Skill-building Activities (with answer key)
    • Read the instructions carefully and answer accordingly. Good Luck!

    1) Identify and label the structures on the external anatomy of an earthworm.


    2) Identify the structures on the internal anatomy of an earthworm and state their function.

    Structure Function
    1

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