Muscle
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Muscle
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Viette Lab 4
Muscles of the Trunk and Abdomen
Muscle | Action | Origin | Insertion |
---|---|---|---|
Trapezius | how | upper ribs | you |
Erector spinae | extends vertebrae and ribs, maintains erect posture | sacrum, ilium, lumbar and thoracic vertebrae, ribs | ribs, cervical and thoracic vertebrae |
External intercostals | elevates and draws ribs together-insperation | inferior border of a rib, external surface | superior border of a rib below, external surface |
Internal intercostals | draws ribs together, depresses thorax (ribs) -experation | superior border of a rib, internal surface | inferior border of rib above, internal surface |
Diaphragm | pulls central tendon down, increasing size of thoracic cavity, inspiration | xiphoid process, costal cartilages of last six ribs, and lumbar vertebrae | central tendon |
External oblique | compresses abdomen, lateral rotation | lower eight ribs | iliac crest, Linea Alba |
Internal oblique | compresses abdomen, lateral rotation | iliac crest | Linea Alba, costal cartilage of last three or four ribs |
Transversus abdominis | compresses abdomen | inguinal ligament, lumbar fascia, and costal cartilage of last six ribs | Linea Alba, and Pubic Crest |
Rectus abdominis | flexes and rotates vertebral column | Pubic Crest and Symphysis Pubis | Costal cartilage of fifth to seventh ribs and xiphoid process |
Trapezius | Rotates Scapula, raises scapula, pulls scapula medially, or pulls scapula and shoulder downward, extend head, laterally flexes head and neck | occipital bone, cervical and thoracic vertebrae | Clavicle, Acromion and Spinous process of Scapula |