Early Stages of Human Embryology: A Quasi-experimental Study from South Kerala, India

Introduction: Physical models are being used in embryology lectures along with PowerPoint presentations to improve the spatial orientation of students. But the demonstration of the sequence of changes is not possible with commercial models due to non availability and high expenses. The latest audio-visual aids including three-dimensional projections like simulation-based screens, or virtual reality enhance the visual-spatial ability of the students but are very costly and not affordable for all institutions.

Aim: To compare the effectiveness of hand-made physical models with the PowerPoint presentation mode of teaching in understanding the 3D concept of embryology, among first-year MBBS students and to assess the students’ perception of this model-based teaching.

Materials and Methods: The study was conducted using a quasi-experimental study design, on 218 phase 1 medical students of Government Medical College, Thiruvananthapuram, Kerala, India, from February 2020 to August 2020. The students were divided into two equal groups. Group B was taught the topic “Second week of embryonic life” with a PowerPoint lecture session (n=109) and the Group A had in addition a demonstration with the handmade models (n=109). Pretest and post-test were conducted with an internally validated questionnaire. Feedback on the student’s acceptance of teaching/learning with models were also collected. The improvement of the test scores was analysed using paired t-tests in both the test and control groups.

Results: Statistically significant improvement in knowledge score was obtained while comparing the post-test scores of the intervention group (mean score was 4.83±2) with that of the non intervention group (mean score was 3.99±2.06) (student’s t-test, p-value <0.05). It was observed, 99.1% of students were satisfied with this model-assisted teaching, especially with the series of models demonstrating the sequence of events. A 93.1% of students said that they needed such model-assisted lectures in other subjects also.

Conclusion: Series of models pertaining to a particular event is beneficial and effective for learning complex concepts of embryology. Also, it’s a long-lasting, innovative mode of teaching which can be done cost-effectively.