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

5. Integumentary System

Nails

Anatomy & Physiology

5. Integumentary System

Nails

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2:18 minutes

Problem 22

Textbook Question

A man got his finger caught in a machine at the factory. The damage was less serious than expected, but the entire nail was torn off his right index finger. The parts lost were the body, root, bed, matrix, and eponychium of the nail. First, define each of these parts. Then, tell if this nail is likely to grow back.

Verified step by step guidance

Define the parts of the nail: The body of the nail is the visible, hard part of the nail that covers the nail bed. The root is the portion of the nail embedded under the skin at the base of the nail. The nail bed is the skin beneath the nail body, providing nutrients and support. The matrix is the tissue at the base of the nail where new nail cells are produced, responsible for nail growth. The eponychium, commonly called the cuticle, is the skin that overlaps the base of the nail and protects the area from infection.

Explain the importance of the nail matrix: The matrix is the most critical part for nail growth because it contains the cells that divide and form new nail tissue. Damage to the matrix can significantly impact the ability of the nail to regenerate.

Assess the likelihood of nail regrowth: If the matrix is permanently damaged or destroyed, the nail is unlikely to grow back. However, if the matrix remains intact or heals properly, there is a chance for regrowth.

Discuss the healing process: The nail bed and surrounding tissues must heal completely to support potential regrowth. Proper wound care and avoiding infection are essential for recovery.

Recommend follow-up care: The individual should consult a healthcare provider to assess the extent of damage to the matrix and surrounding tissues. They may suggest treatments or interventions to promote healing and regrowth, if possible.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Nail Anatomy

Nail anatomy consists of several key components: the body is the visible part of the nail, the root is the hidden part under the cuticle, the nail bed is the skin beneath the nail, the matrix is the tissue that produces new nail cells, and the eponychium is the cuticle that protects the matrix. Understanding these parts is essential for assessing nail injuries and their potential for regrowth.

Nail Growth Process

Nail growth occurs from the matrix, where new cells are generated and push older cells forward, forming the nail plate. The average growth rate of fingernails is about 1/8 inch per month. If the matrix is intact and healthy, the nail can regenerate, but damage to the matrix can hinder or prevent regrowth.

Injury Impact on Nail Regrowth

The extent of injury to the nail and its components significantly affects regrowth. If the matrix is damaged, the nail may grow back irregularly or not at all. In this case, since the damage was less serious than expected, and assuming the matrix remains intact, the nail is likely to grow back, although it may take several months to fully regenerate.