2Q 



FIG. 87. Diagrammatic median section of the human body. 1, cranium; 2, nos- 

 trils (external nares); S, mouth; 4, internal nostrils; 5, pharynx; 6, 'Adam's apple'; 7, 

 trachea (to lungs); 8, oesophagus; 9, sternum (breast bone) imbedded in body wall; 

 10, lungs; 11, heart; 12, thoracic cavity (part of coelom); IS, diaphragm; 14, ab- 

 dominal cavity (part of coelom) ; 15, liver; 16, stomach; 1 7, large intestine; 1 8, kidney; 

 1 9, small intestine; 20, ureter; 21, vermiform appendix of large intestine; ##, urinary 

 bladder; 23, pubis of pelvic girdle; 24, urethra; 25, anus; 26, coccyx; 27, posterior 

 part of neural canal; 28, centrum of vertebra; 29, neural spines of vertebrae; SO, 

 spinal cord; 31, medulla; 32, cerebellum; S3, cerebral hemisphere. 



153 



