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

 trils (external nares); 3, mouth; 4, internal nostrils; o, 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) ; 13, diaphragm; 14, ab- 

 dominal cavity (part of coelom) ; 15, liver; 16, stomach; 17, large intestine; 18, kidney; 

 19, small intestine; 20, ureter; 21, vermiform appendix of large intestine; 22, 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; 30, 

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



153 



