Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

15. The Special Senses

Structure of the Eyeball

Anatomy & Physiology

15. The Special Senses

Structure of the Eyeball

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Multiple Choice

The external layer of the eyeball is the ______ tunic.

vascular

retinal

neural

fibrous

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Verified step by step guidance

Step 1: Understand the anatomy of the eyeball, which consists of three main layers or tunics: the fibrous tunic, the vascular tunic, and the retinal (neural) tunic.

Step 2: Recognize that the fibrous tunic is the outermost layer of the eyeball, providing structural support and protection. It includes the sclera (the white part of the eye) and the cornea (the transparent front part).

Step 3: Differentiate the vascular tunic, which is the middle layer, responsible for supplying blood and nutrients to the eye. It includes structures like the choroid, ciliary body, and iris.

Step 4: Identify the retinal tunic (neural tunic) as the innermost layer, which contains photoreceptor cells (rods and cones) responsible for detecting light and transmitting visual information to the brain.

Step 5: Based on the description of the external layer of the eyeball, conclude that the correct answer is the fibrous tunic, as it is the outermost protective layer.