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Related Experiment Video

Updated: Jan 5, 2026

Intracellular Recording, Sensory Field Mapping, and Culturing Identified Neurons in the Leech, Hirudo medicinalis

Intracellular Recording, Sensory Field Mapping, and Culturing Identified Neurons in the Leech, Hirudo medicinalis

Published on: November 4, 2013

Teaching basic neurophysiology using intact earthworms.

Nikolay Kladt¹, Ulrike Hanslik, Hans-Georg Heinzel

¹Institut fuer Zoologie, University of Bonn, Poppelsdorfer Schloss, 53115 Bonn, Germany; ; Janelia Farm Research Campus, HHMI, Ashburn VA 20147, U. S.

Journal of Undergraduate Neuroscience Education : JUNE : a Publication of FUN, Faculty for Undergraduate Neuroscience

|March 16, 2013

Summary

This summary is machine-generated.

Earthworm giant fiber preparations offer a successful and accessible alternative for teaching neurobiology practicals. These experiments bypass the need for expensive equipment and high instructor ratios, ensuring a high success rate for students.

Keywords:

action potentials conduction velocity earthworms extracellular recordings facilitation of conduction velocity flight reflexes giant fibers giant motorneuron refractory period spatial size of action potentials synaptic depression and facilitation threshold

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Area of Science:

Neurobiology education
Physiology practicals

Background:

Traditional neurobiology practicals are hindered by expensive equipment, time constraints, and high expertise requirements.
Existing alternatives like simulations or basic experiments (e.g., frog sciatic nerve) are often time-consuming, tedious, or have low success rates.

Purpose of the Study:

To present earthworm giant fiber preparations as an effective and accessible teaching tool for introductory neurobiology courses.
To describe and optimize experimental protocols for classroom application, focusing on fundamental neurobiological principles.
To share experiences from implementing these experiments in university-level animal physiology and neurobiology courses.

Main Methods:

Utilized action potential recordings from giant fibers of intact earthworms (Lumbricus terrestris).
Adapted and refined existing experimental protocols (originally developed by Drewes and Heinzel) for classroom settings.
Focused on experiments demonstrating specific neurobiological principles with optimized protocols for ease of execution and high success rates.

Main Results:

Earthworm giant fiber preparations demonstrated a nearly 100% success rate in action potential recordings.
The experiments effectively circumvented common limitations of traditional practicals, such as equipment cost and complexity.
Optimized protocols facilitated successful completion within typical classroom timeframes and expertise levels.

Conclusions:

Earthworm giant fiber preparations provide a highly successful, cost-effective, and time-efficient method for teaching core neurobiology concepts.
These experiments are a valuable alternative to traditional practicals, enhancing student learning in introductory and advanced courses.
The described protocols are suitable for implementation in various university-level physiology and neurobiology curricula.