What are the origin and insertion of the internal intercostal muscle?
Understand the Problem
The question is asking for the origin and insertion points of the internal intercostal muscles, which are key details in anatomy related to muscle structure and function.
Answer
Origin: Inferior borders of the first to eleventh ribs; Insertion: Superior borders of the ribs below.
The internal intercostal muscles originate from the inferior borders of the first to eleventh ribs and their adjacent costal cartilages, and insert on the superior borders of the ribs and costal cartilages immediately below the origin sites.
Answer for screen readers
The internal intercostal muscles originate from the inferior borders of the first to eleventh ribs and their adjacent costal cartilages, and insert on the superior borders of the ribs and costal cartilages immediately below the origin sites.
More Information
The internal intercostal muscles play a crucial role in respiration by depressing the ribs during forced expiration, helping to expel air from the lungs.
Tips
A common mistake is confusing the orientation of these muscles with external intercostals. Internal intercostals run inferolaterally, while external intercostals run inferomedially.
Sources
- Internal intercostal muscles - elsevier.com
- Internal intercostal muscles - Wikipedia - en.wikipedia.org
- Intercostal muscles: Attachments, innervation, functions - Kenhub - kenhub.com
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