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

8. Joints

Classification of Joints

Anatomy & Physiology

8. Joints

Classification of Joints

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Problem 2

Textbook Question

Which functional joint class includes freely moveable joints?
a. Amphiarthroses
b. Synarthroses
c. Diarthroses
d. All functional joint classes are freely movable.

Verified step by step guidance

Understand the three functional joint classes: Synarthroses (immovable joints), Amphiarthroses (slightly movable joints), and Diarthroses (freely movable joints).

Recall that functional joint classification is based on the degree of movement allowed by the joint.

Focus on the term 'freely movable joints' in the question, which corresponds to the functional joint class that allows the greatest range of motion.

Eliminate incorrect options: Synarthroses are immovable, and Amphiarthroses are only slightly movable, so they do not fit the description of 'freely movable.'

Conclude that the correct functional joint class for freely movable joints is Diarthroses.

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Key Concepts

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

Functional Joint Classes

Functional joint classes categorize joints based on their movement capabilities. The three main classes are synarthroses (immovable joints), amphiarthroses (slightly movable joints), and diarthroses (freely movable joints). Understanding these classifications is essential for identifying the type of movement allowed at each joint.

Diarthroses

Diarthroses, also known as synovial joints, are characterized by a joint cavity filled with synovial fluid, allowing for a wide range of motion. Examples include the knee, elbow, and shoulder joints. Recognizing diarthroses is crucial for understanding the functional capabilities of joints in the human body.

Synarthroses and Amphiarthroses

Synarthroses are joints that do not allow any movement, such as sutures in the skull, while amphiarthroses permit limited movement, like the joints between vertebrae. These concepts contrast with diarthroses and help clarify the spectrum of joint mobility, which is vital for answering questions about joint classifications.

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Related Practice

Textbook Question

Match the key terms to the appropriate descriptions.

Key:

a. fibrous joints

b. cartilaginous joints

c. synovial joints

_____ (1) exhibit a joint cavity

_____ (2) types are sutures and syndesmoses

_____ (3) bones connected by collagen fibers

_____ (4) types include synchondroses and symphyses

_____ (5) all are diarthrotic

_____ (6) many are amphiarthrotic

_____ (7) bones connected by a disc of hyaline cartilage or fibrocartilage

_____ (8) nearly all are synarthrotic

_____ (9) shoulder, hip, jaw, and elbow joints

Anatomical characteristics shared by all synovial joints include all except:

a. Articular cartilage

b. A joint cavity

c. An articular capsule

d. Presence of fibrocartilage

The description 'Articular surfaces deep and secure; capsule heavily reinforced by ligaments and muscle tendons; extremely stable joint' best describes

a. The elbow joint

b. The hip joint

c. The knee joint

d. The shoulder joint

Define joint.