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Muscle Origin & Insertion
Muscle origins & insertions
O = manubrium & medial clavicle; I = mastoid process & superior nuchal line of occipital bone
O = medial surface of mandible; I = hyoid bone & median raphe
O = thyroid cartilage; I = hyoid bone
O = sternal end of clavicle, sternum, cartilage of ribs 1-6 & aponeurosis of external oblique; I = sulcus & intertubucular groove
O = inferior border of rib above; I = superior border of rib below
O = internal surface of rib cage & sternum, costal cartilages of last 6 ribs & lumbar vertebrae; I = central tendon
O = occipital bone, spine of C7 & all thoracic vertebrae; I = acromion, spine of scapula & lateral 1/3 of the clavicle
O = lower 6 thoracic vertebrae, lumbar vertebrae, lower 3 to 4 ribs & iliac crest; I = floor of intertubercular sulcus of humerus
O = spinous processes of T2 - T5; I = medial border of scapula
O = spinous processes of C7 & T1; I = medial border of scapula
O = pubic crest & symphysis; I = xiphoid process & costal cartilage of ribs 5 - 7