48 



213. Model to illustrate the action of the intercostal 

 muscles in respiration. 



E. 158. 1874. 



This onsists of an upright rod on a stand ; three other rods 

 form with ifc a parallelogram, across the two diagonals of which 

 are stretched elastic bands to represent the internal and external 

 intercostal muscles, 



214. Model of the heart and great vessels of the 

 human foetus, with the principal cardiac nerves much 

 enlarged. 



B. 14-. 1862. Made by 'the late Dr. Auzoux, Paris. 



The left side of the heart can be removed en masse to 

 exhibit the foramen ovale, whilst its own interior is shown by 

 means of a movable flap. A door opens in the right auricle 

 and ventricle exhibiting the Eustachian valve, which is also 

 visible through a foramen in the posterior wall. 



215. Model of the adult human heart, natural size. 

 E. 18. 1862. Made by the late Dr. Auzoux, Paris. 



This is made to open in the same way as the foetal heart just 

 mentioned, so as to show the differences in its internal anatomy. 



216. Model of the human heart, with the roots of the 

 great vessels, enlarged. 



E. 6. 1879. Made by T. P. Mailing, Christiania. 



The pericardium has been reflected, and the front wall of the 

 heart can be lifted off so as to show the interior of the auricles 

 and ventricles, as well as of the root of the pulmonary artery 

 with its valves. 



217. Model of the human heart, much enlarged, 

 mounted on a stand, in which is a drawer containing 

 an explanatory pamphlet in German. 



Exhibited by Paul Zeiller, Munich. 1879. Price 31. 10s. 



A door in the right side of the heart shows the tricuspid valve 

 and the cavities of the right auricle and ventricle ; the two 

 halves of the heart are separable, and a door in the left side 

 shows in addition the root of the aorta and its valves. 



218. Model of the human heart, somewhat enlarged. 



Made by Ramme and Sodtmann, Hamburg. 

 E. 42. 1880. 



The front wall of the right auricle can be lifted off to show 

 the interior of that cavity, as also the front wall of the left 



