In: Anatomy and Physiology
Please complete entire table
Muscles of the trunk (anterior):
Muscle |
Origin/Insertion |
Primary Action |
Pectoralis minor |
O: ribs I: coracoid process of scapula |
Depresses shoulder |
Pectoralis major |
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Internal Intercostal |
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External Intercostal |
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External Oblique |
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Rectus abdominus |
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Transverse abdominus |
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Diaphragm |
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Serratus anterior |
Muscle |
Origin |
Insertion |
Primary action |
Pectoralis minor |
ribs |
Coracoid process of scapula |
Depresses shoulder |
Pectoralis major |
ribs 2-6, sternum, and clavicle |
greater tubercle of humerus |
flexion, adduction, and medial rotation at shoulder |
Internal Intercostal |
superior border of each rib |
inferior border of each rib |
depresses ribs |
External Intercostal |
inferior border of each rib |
superior border of each rib |
elevates ribs |
External Oblique |
ribs 5-12 |
linea alba and pubis |
compresses abdomen, depresses ribs, flexes or bends spine |
Rectus abdominus |
superior surface of pubis around symphysis |
xiphoid process of sternum |
depresses ribs, flexes vertebral column, compresses abdomen |
Transverse abdominus |
cartilage of ribs 6-12, iliac crest |
linea alba and pubis |
Compresses abdomen |
Diaphragm |
Lumbar vertebrae of spine & inferior border of ribs and sternum. |
Central tendon |
Inspiration |
Serratus anterior |
ribs 1-8 |
vertebral border of scapula |
protracts scapula |
Muscle |
Origin |
Insertion |
Primary action |
Pectoralis minor |
ribs |
Coracoid process of scapula |
Depresses shoulder |
Pectoralis major |
ribs 2-6, sternum, and clavicle |
greater tubercle of humerus |
flexion, adduction, and medial rotation at shoulder |
Internal Intercostal |
superior border of each rib |
inferior border of each rib |
depresses ribs |
External Intercostal |
inferior border of each rib |
superior border of each rib |
elevates ribs |
External Oblique |
ribs 5-12 |
linea alba and pubis |
compresses abdomen, depresses ribs, flexes or bends spine |
Rectus abdominus |
superior surface of pubis around symphysis |
xiphoid process of sternum |
depresses ribs, flexes vertebral column, compresses abdomen |
Transverse abdominus |
cartilage of ribs 6-12, iliac crest |
linea alba and pubis |
Compresses abdomen |
Diaphragm |
Lumbar vertebrae of spine & inferior border of ribs and sternum. |
Central tendon |
Inspiration |
Serratus anterior |
ribs 1-8 |
vertebral border of scapula |
protracts scapula |