Multiple Choice
Which anatomical structure serves as the articulation site for the tubercle of a rib?
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1. Introduction to Anatomy & Physiology
Anatomical Terms for the Arm and Hand
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Which of the following abdominal muscles has fibers that run in an inferomedial direction?
A
Rectus abdominis
B
Transversus abdominis
C
External oblique
D
Internal oblique
Verified step by step guidance1
Understand the orientation of muscle fibers in the abdominal region. Each abdominal muscle has a distinct fiber direction that contributes to its function and anatomical positioning.
Review the external oblique muscle. Its fibers run in an inferomedial direction, meaning they travel downward and toward the midline of the body. This is a key characteristic of the external oblique muscle.
Compare the external oblique with the other muscles listed: Rectus abdominis has vertically oriented fibers, Transversus abdominis has horizontally oriented fibers, and Internal oblique has fibers that run in a superomedial direction (upward and toward the midline).
Inferomedial fiber direction is unique to the external oblique muscle among the options provided. This orientation allows the external oblique to assist in trunk rotation and lateral flexion.
Conclude that the external oblique muscle is the correct answer based on its fiber direction and anatomical function.
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