What's inside an eyeball? | Eyeball Dissection | We The Curious

Introduction

This tutorial guides you through the fascinating process of dissecting a horse eyeball to explore its anatomy and understand how eyes function. Whether you're a student, teacher, or simply curious about biology, this step-by-step guide will enhance your knowledge of one of the most intricate organs in the body.

Step 1: Gather Your Materials

Before starting the dissection, ensure you have all necessary materials ready:

• A horse eyeball (can be obtained from a biological supply company)
• Dissection kit (scalpel, scissors, forceps)
• Dissection tray
• Gloves and safety goggles
• Paper towels for cleanup
• Anatomy reference materials (books or online resources)

Step 2: Prepare for Dissection

Take safety precautions and prepare your workspace:

• Put on gloves and safety goggles to protect yourself.
• Place the eyeball in the dissection tray, ensuring you have a clear view from all angles.
• Familiarize yourself with the anatomy of the eye using your reference materials.

Step 3: Examine the Exterior of the Eyeball

Start by observing the outside of the eyeball:

• Note the shape and size, and compare it to a human eye.
• Identify the sclera (the white part) and the cornea (the transparent front part).
• Observe any additional structures, such as the optic nerve.

Step 4: Make the Initial Incision

Carefully make your first incision:

• Use a scalpel to make a small cut at the top of the eyeball.
• Be gentle to avoid damaging the inner structures.

Step 5: Open the Eyeball

Once the initial incision is made, proceed to open the eyeball:

• Slowly cut around the circumference of the eye to create a larger opening.
• Use forceps to gently pull apart the halves of the eyeball.

Step 6: Identify Internal Structures

Explore the internal anatomy of the eyeball:

• Locate the lens, which is usually clear and located behind the cornea.
• Identify the vitreous humor, the gel-like substance filling the eyeball.
• Observe the retina, which lines the interior and is responsible for light detection.
• Take notes or photos of each structure for reference.

Step 7: Discuss the Functions of Each Part

As you identify each part, understand its function:

• Cornea: Protects the eye and helps focus light.
• Lens: Adjusts to focus light onto the retina.
• Retina: Contains photoreceptors that convert light into neural signals.
• Vitreous Humor: Maintains eye shape and allows light to pass through.

Step 8: Clean Up

After the dissection, ensure a tidy workspace:

• Dispose of the eyeball and any biological materials properly.
• Clean your tools and workspace with disinfectant.
• Wash your hands thoroughly after removing gloves.

Conclusion

Dissecting an eyeball provides valuable insights into the anatomy and functionality of this vital organ. By following these steps, you can gain a deeper appreciation for how your eyes work. Consider exploring other dissection tutorials or anatomy resources to further your understanding of biological structures.