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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 Heart2h 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

7. The Skeletal System

Bones of the Upper Limb

Anatomy & Physiology

7. The Skeletal System

Bones of the Upper Limb

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Multiple Choice

When a person falls, a common reaction is to try to catch themselves by sticking out their hands. This will sometimes lead to a fracture in one or both of the bones of the forearm. Because one forearm bone is larger where it articulates with the wrist, this bone tends to absorb more force from the impact and is broken more often, making it the most commonly broken bone in the body. Where would such a break likely occur?

The distal end of the ulna.

The proximal end of the ulna.

The distal end of the radius.

The proximal end of the radius.

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Verified step by step guidance

Identify the bones in the forearm: The forearm consists of two bones, the radius and the ulna.

Understand the anatomy of the radius and ulna: The radius is larger at the distal end where it articulates with the wrist, while the ulna is larger at the proximal end near the elbow.

Consider the mechanics of a fall: When a person falls and extends their hands to catch themselves, the force of impact is absorbed primarily by the distal end of the forearm bones.

Analyze which bone is more likely to fracture: Since the radius is larger at the distal end, it absorbs more force during impact, making it more susceptible to fractures.

Conclude the likely location of the fracture: Given the anatomy and mechanics, the distal end of the radius is the most common site for fractures when a person falls and tries to catch themselves.

5:3m

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Master Overview of the Arm and Forearm with a bite sized video explanation from Bruce Bryan

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Related Practice

Open Question

The bones of the hand articulate distally with the (a) carpal bones, (b) ulna and radius, (c) metacarpals, (d) phalanges.

Open Question

At the glenoid cavity, the scapula articulates with the proximal end of the (a) humerus, (b) radius, (c) ulna, (d) femur.

Open Question

Jack injures himself playing hockey, and the physician who examines him informs him that he has dislocated his pollex. What part of Jack's body did he injure? (a) his arm, (b) his leg, (c) his hip, (d) his thumb, (e) his shoulder.

Multiple Choice

Of the two bones in the forearm, which bone is medial?

Multiple Choice

Arrange the bones of the upper limb from proximal to distal. Some bones may not be included.

Multiple Choice

Often people will 'crack' their knuckle by pulling on their pointer finger. The cracking sound comes from knuckle where the finger meets the hand. What's another way to describe this location?

Multiple Choice

Choose the INCORRECT pairing.

Activity

Radius and ulna of the right forearm