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

Introduction to Joints

Anatomy & Physiology

8. Joints

Introduction to Joints

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2:01 minutes

Problem 18

Textbook Question

Name all the bones with which the ulna articulates.

Verified step by step guidance

Identify the anatomical location of the ulna: The ulna is one of the two bones in the forearm, located on the medial side (closer to the body) when in anatomical position.

Understand the proximal articulation: The ulna articulates with the humerus at the elbow joint. Specifically, the trochlear notch of the ulna fits into the trochlea of the humerus.

Examine the distal articulation: The ulna articulates with the radius at the distal radioulnar joint. This allows for rotational movement of the forearm (pronation and supination).

Consider the proximal radioulnar joint: The ulna also articulates with the radius at the proximal radioulnar joint, where the radial notch of the ulna accommodates the head of the radius.

Note the wrist articulation: Although the ulna does not directly articulate with the carpal bones, it is connected to the wrist via the triangular fibrocartilage complex (TFCC), which stabilizes the distal radioulnar joint and indirectly supports wrist movement.

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Key Concepts

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

Ulna Anatomy

The ulna is one of the two long bones in the forearm, located on the opposite side of the thumb. It plays a crucial role in the structure of the arm and is involved in the movement of the elbow and wrist joints. Understanding its anatomy is essential for identifying its articulations with other bones.

Articulation

Articulation refers to the connection between two bones that allows for movement and flexibility. In the context of the ulna, it is important to know which bones it articulates with to understand its function in the skeletal system. The ulna primarily articulates with the humerus at the elbow and the radius at the wrist.

Forearm Bones

The forearm consists of two main bones: the ulna and the radius. These bones work together to facilitate a range of motions in the arm. Recognizing the relationship between these bones and their articulations is vital for comprehending the mechanics of the forearm and the overall skeletal structure.