1. Floor is the: Answer *diaphragm, a musculotendinous septum that separates thoraciccavity from abdomen 2. First seven ribs attach to: Answer sternum by costal cartilages 3. Ribs 8, 9, and 10 attach to: Answer costal cartilage above 4. Ribs 11 and 12 are: Answer Floating with free palpable tips 5. Costochondral junctions: Answer points at which ribs join their cartilages; they are notpalpable 6. Suprasternal notch: Answer feel this hollow U-shaped depression just above sternumbetween clavicles 7. Sternum: Answer "breastbone" has three parts; manubrium, body, and xiphoid process 8. Manubriosternal angle: Answer called "angle of Louis," at articulation of manubrium andsternum, and continuous with second rib