Exam 2 Functions (Superficial and Intermediate Back Muscles, Anterior/Posterior Abdominal Wall

trapezius

elevation, retraction, and rotation of scapula

latissimus dorsi

extension, adduction, and medial rotation of humerus

Levator scapulae

elevation of scapula medially and tilts glenoid cavity inferiorly

Rhomboid major and minor

Retraction of scapula, rotation of scapula

Serratus posterior superior

elevation of ribs

Serratus posterior inferior

Depression of ribs

External abdominal oblique and internal abdominal oblique

compression and support of abdominal viscera; flexion and rotation of trunk

Transversus abdominis

compression and support of abdominal viscera

Rectus abdominis

Flexion of trunk and compression of abdominal viscera

Psoas major

flexion of hip; flexion of vertebral column laterally; flexion of trunk

Illiacus

flexion of thigh at hip; stabilization of hip joint

Quadratus lumborum

Extension and laterally flexes vertebral column; fixes 12th rib during inspiration

Respiratory diaphragm

Draws central tendon down and forward during inspiration