1. Introduction to Anatomy & Physiology5h 40m
2. Cell Chemistry & Cell Components12h 37m
3. Energy & Cell Processes10h 7m
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 Blood1h 22m
18. The Heart1h 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 Balance Coming soon
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity Coming soon

7. The Skeletal System

The Pectoral Girdle

Anatomy & Physiology

7. The Skeletal System

The Pectoral Girdle

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3:28 minutes

Problem 4

Textbook Question

In anatomical position, the ulna lies (a) medial to the radius, (b) lateral to the radius, (c) inferior to the radius, (d) superior to the radius.

Verified step by step guidance

Understand the anatomical position: The body is standing upright, facing forward, with arms at the sides and palms facing forward.

Identify the location of the ulna and radius: Both are bones in the forearm.

Determine the relative position: The ulna is on the side of the little finger, while the radius is on the side of the thumb.

In anatomical terms, 'medial' means closer to the midline of the body, and 'lateral' means further from the midline.

Conclude that in the anatomical position, the ulna is medial to the radius.

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Key Concepts

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

Anatomical Position

The anatomical position is a standardized posture used in anatomy to describe the location of body parts. In this position, the body stands upright, facing forward, with arms at the sides and palms facing forward. This reference point allows for consistent communication about the locations and relationships of structures in the body.

Ulna and Radius

The ulna and radius are the two long bones of the forearm. The ulna is located on the medial side of the forearm, while the radius is on the lateral side when in the anatomical position. Understanding their relative positions is crucial for identifying their functions and interactions in movements of the arm and wrist.

Medial and Lateral Orientation

Medial and lateral are terms used to describe the position of structures in relation to the midline of the body. Medial refers to a position closer to the midline, while lateral indicates a position further away from it. In the context of the ulna and radius, recognizing that the ulna is medial to the radius helps clarify their anatomical relationships.