Name
Pronunciation
(in-ter-KOS-talz)
Origin/Proximal Attachment
Inferior border of an upper rib
Insertion/Distal Attachment
Superior border of a rib below (External muscle fibres run obliquely & anteriorly, inserting toward the costal cartilage)
Action/Relevance
Elevates the ribs in inspiration (superior ribs fixed) May depress the ribs in forced expiration (inferior ribs fixed)
Innervation
Intercostal nerves
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