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Viette Lab 4

Muscles of the Trunk and Abdomen

MuscleActionOriginInsertion
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
Created by: Drbrown2346
 

 



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