XII 



PHYLUM CHORDATA 



is formed by the palate. The anterior part, or hard palate, 

 is crossed by a series of transverse ridges of its mucous 

 membrane. The posterior part, or soft palate (Fig. 282, 

 vel.pl.\ ends behind in a free pendulous flap in front of 

 the opening of the posterior nares. Behind the mouth or 

 buccal cavity proper is the pharynx. The pharynx is divided 



cbl 



ftLlna 



FIG. 282. Lepus cuniculus. Lateral dissection of the head, neck and thorax. The 

 head and spinal column are represented in mesial vertical section ; the left lung 

 is removed ; the greater part of the nasal septum is removed so as to show the 

 right nasal cavity with its turbinals. aort. dorsal aorta ; b. hy. basi-hyal ; cbl. 

 cerebellum ; cer. cerebral hemispheres ; cor. v. coronary vein ; dia. diaphragm ; 

 ep. epiglottis ; en. opening of Eustachian tube into pharynx ; lar. larynx ; l.j. v. 

 left jugular vein ; /. sb. a. left subclavian artery ; /. sb. v left subclavian vein ; 

 tned. medulla oblongata ; ines, eth. mesethmoid ; mx. trb. maxilla-turbinal ; as. 

 oesophagus ; olf. olfactory lobe ; pi. art. pulmonary artery ; p. max. pre-maxilla ; 

 pr. st. pre-sternum \pt.c. post-caval vein ; rt.l.lng. root of left lung with bronchus 

 and pulmonary veins and artery cut across ; s. gl. sub-lingual salivary gland ; 

 j. mx.gl. sub-maxillary salivary gland ; st. sternebrae ; tng. tongue ; tr. trachea ; 

 trb. ethmo-turbinals ; "vel.pl. soft palate. 



into two parts, an upper or nasal division, and a lower or 

 buccal division, by the soft palate. Into the nasal division 

 open in front the two posterior nares and at the sides the 

 openings of the Eustachian tubes (eu.). The nasal division 

 is continuous with the buccal division round the posterior 



