Thoradelphus

(tho-rad-el' -fus). A mono cephalic dual monstrosity with the bodies united above the umbilicus, and with four lower and two upper extremities Thorax (tho'-raks). The chest, or the conic framework of bones and soft ti ues, is bounded by the diaphragm below, the ribs and sternum in front, the ribs and corresponding por.ion of the vertebral column behind and above by the structures in the lower part of the neck; it contains the heart inclosed in the pericardium and the lungs invested by the pleura, etc. T., Regions of. See Regions. 10 ji Muscles of Ventral Aspect of Thorax.. Pectoral is major. 2. Its clavicular portion. 3. Its sternocostal portion. 4. Its humeral attachment, divided and displaced upward. 5,5,5. Its fasciculi of attachment to ribs. 6. Pectoral is minor. 7. Sub clavi us. 8. Deltoid. 9. Inferior border of pectoral is minor. 10. Digitations of serratus magnus. 11. Corresponding digitations of the external oblique. 12, 12. Ventral border of lat is sim us dors i. 13. Its tendon of attachment to humerus. 14. Teres major. 15. Subscapulars. 16. Long head of triceps. 17. Lower portion of deltoid. 18. Sterno-mastoid. 19. Lower portion of sierno-hyoid. 20. Trapezius.