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

10. Muscles

Muscle Actions

Anatomy & Physiology

10. Muscles

Muscle Actions

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the erector spinae muscles is most lateral to the vertebral column?

Semispinalis

Longissimus

Spinalis

Iliocostalis

Previous problemNext problem

Verified step by step guidance

Understand the anatomy of the erector spinae muscle group, which consists of three main muscles: spinalis, longissimus, and iliocostalis. These muscles are responsible for extending and laterally flexing the vertebral column.

Identify the relative positions of these muscles. The spinalis muscle is closest to the vertebral column (most medial), followed by the longissimus muscle, which is intermediate, and finally the iliocostalis muscle, which is the most lateral.

Note that the semispinalis muscle is not part of the erector spinae group. It is part of the transversospinalis group, which lies deeper and is involved in rotation and extension of the spine.

Focus on the iliocostalis muscle, which is located laterally along the ribs and is the most lateral of the erector spinae muscles. It plays a key role in lateral flexion and extension of the spine.

Conclude that the iliocostalis muscle is the correct answer because it is the most lateral muscle in the erector spinae group, positioned furthest from the vertebral column.