muscle | origin | insertion | action | location |
Pectoralis Major | -sternum; clavicle; cartilage of ribs 1-7; aponeurosis of external oblique | Humerus | -flexes, adducts rotates the arm medially. | thorax |
Pectoralis Minor | | | Stabilizes scapular for arm movements; elevates ribs in inspiration. | thorax |
External intercostals | -rib-superior | -rib-inferior | -elevates ribs; inhalation | thorax |
Internal intercostals | -rib-inferior | -rib-superior | -depresses ribs; expiration | thorax |
Diaphragm | -sternum; costal cartilage 7-12; Lumbar vertebrae | Central tendon | -Increases volume of thoracic cavity (respiration)
-increase intraabdominal pressure (micturition, defecation, childbirth) | thorax |
External oblique | -lower 8 ribs (5-12) | -Iliac crest
-linea alba | -lateral rotation & lateral flexion of the trunk | anterior abdomen |
Internal oblique | Ilium | -10-12th ribs | -lateral rotation & lateral flexion of trunk | anterior abdomen |
Transverse oblique | 7-12th costal cartilage; ilium | -sternum; pubis | -compresses abdomen | anterior abdomen |
Rectus abdominis | -pubis | -sternum; inferior ribs | -flexes trunk at the waist; compresses abdomen | anterior abdomen |
Psoas major & iliacus | | | -flexes thigh (hip joint) & flexes Lumbar vertebral column (trunk) | posterior abdomen |
Quadratus lumborum | | | -flexes lumbar region laterally
-fixes ribs 11 & 12 in forced expiration | posterior abdomen |
DELTOID | CLAVICLE | HUMERUS; SCAPULA | PRIMEMOVER arm abduction, flexion and extension of arm; medial and lateral arm rotation | upper limb |
Serratus anterior | Ribs 1-8 | Scapula | Fixes scapula in place during ant. arm movement; rotates scapula so inferior angle moves lateral and upward; abduction and raising arm…horizontal arm mvt..boxers muscle | anterior thorax |
Coracobrachialis | Scapula | Humerus | Arm flexsion; adduction | upper limb |
Trapezius | ocipital (ext. occip. Prot. & sup nuchal line
-ligamentum nuchae; C7; all T vertebrae | -scapula (spine, acromion)
-clavicle | -elevation, depression, adduction of scalpula
-extensor of head | posterior thorax |
Rhomboid major | | | Adduction (retraction) of scapula; fixes scapula for arm mvt. | posterior thorax |
Rhomboid minor | | | Adduction (retraction) of scapula; fixes scapula for arm mvt. | posterior thorax |
Levator scapulae | | | Elevates scapula | posterior thorax |
Latissimus dorsi | Thoracolumbar fascia; iliac crest; lower 3 ribs | Humerus | Extends, adducts, medially rotates arm | posterior thorax |
Pelvic diaphragm
-levator ani: pubococcygeus + iliococcygeus
- coccyge | | | -both function to support pelvic floor & resists increased intraabdominal pressure; aids in defecation | pelvic muscle |
Urogenital diaphragm | | | -stretches across anterior half of pelvic outlet to support the external genitals. | pelvic muscle |
scalenes | | | -to elevate ribs 1 & 2 during inhalation; flex cervical spine;flex | vertebral muscles |