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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 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

10. Muscles

Origin and Insertion

Anatomy & Physiology

10. Muscles

Origin and Insertion

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Multiple Choice

The flexor carpi ulnaris is a muscle that adducts and flexes the hand at the wrist. The muscle attaches to both the humerus and the base of the 5th metacarpal. Based on the movement that this muscle performs, which attachment is the origin?

Humerus.

Wrist.

5th metacarpal.

It's impossible to say from the information given.

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Verified step by step guidance

Understand the terms: The 'origin' of a muscle is the attachment site that doesn't move during contraction, while the 'insertion' is the attachment site that moves.

Identify the movement: The flexor carpi ulnaris muscle adducts and flexes the hand at the wrist. This means it pulls the hand towards the body and bends the wrist.

Consider the attachments: The muscle attaches to the humerus (upper arm bone) and the base of the 5th metacarpal (bone in the hand).

Determine which attachment moves: During wrist flexion and adduction, the hand (and thus the 5th metacarpal) moves, while the humerus remains stationary.

Conclude the origin: Since the humerus is the attachment that does not move during the muscle's action, it is the origin of the flexor carpi ulnaris.