Use your knowledge of directional terms to relate the following structures to each other anatomically by filling in the blank.
1. The spinal cord is to the vertebral column.
2. The thumb is to the elbow.
3. The humerus is to the ulna.
4. The lungs are to the heart.
5. The dorsal aorta is to the vertebral column.
6. The lumbar vertebrae are to the thoracic vertebrae.
7. The scapula is to the clavicle.
8. The bladder is to the small intestine.
9. The esophagus is to the trachea.
10. The femur is to the fibula.
11. The patella is to the knee joint.
12. The pelvic girdle is to the vagina.
13. The intestines are to the liver.
14. The nasal cavity is to the mouth.
15. The heart is to the elbow.
16. The heart is to the stomach.
17. The atlas vertebra is to the axis vertebra.
18. The fibula is to the femur.
19. The radius is to the phalanges.
20. The testes are to the bladder.