hyperextends head Ligamentum nuchae & spinous processes of vertebrae C7-T6 Mastoid process of temporal bone, occipital bone Muscle Action Origin Insertion Internal intercostals Draws ribs together & depresses ribcage Superior border of rib below Inferior border of rib above Superior border of rib below
External intercostals Pulls ribs together to elevate ribcage Inferior border of rib above Pectoralis minor Protracts & depresses scapula Ribs 3–5 Coracoid process of scapula Serratus anterior Protects & holds scapula against chest wall; Rotates scapula laterally & upward Ribs 1–8 Medial border of scapula Trapezius Fixes, elevates, retracts, & rotates scapula Occipital bone, vertebral column C 7 -T 12 Acromion, spine of scapula, lateral third of clavicle Rhomboids Stabilizes/fixes scapula Vertebral spinous processes C 7 -T 5 Medial border of scapula Rectus abdominis Flexes and rotates vertebral column Pubic crest & symphysis Xiphoid process, lower costal cartilages External oblique Internal oblique Flexes vertebral column, rotates & flexes vertebral column laterally, compresses abdomen Outer surface of lower ribs Lumbar fascia, Iliac crest Linea alba, pubic crest & tubercle, iliac crest Linea alba, pubic crest, costal margin & last 3 or 4 ribs Transversus Abdominis Compresses abdomen Lumbar fascia, iliac crest, lower costal cartilages of last 6 ribs Linea alba, pubic crest Pectoralis major Flexes, adducts, medially rotates arm Clavicle, sternum, costal cartilages of ribs 1-6 Greater tubercle of humerus Latissimus dorsi Extends, adducts, medially rotates arm Vertebrae, ribs, iliac crest, inferior angle of scapula Humerus Teres major Extends, medially rotates, adducts arm Inferior angle of scapula Lesser tubercle of humerus Infraspinatus Laterally rotates arm Infraspinous fossa of scapula Greater tubercle of humerus Muscle Action Origin Insertion Deltoid
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- Spring '16
- Mrs. Gonzoles
- Anatomy, Prime mover, Linea Aspera, Medial border of scapula, medially rotates thigh