BONES 



43 



3. Bones and connective tissue. In table 13 is an enumera- 

 tion of the bones forming the skeleton of the rat (Conrow). 



Skull 



Cranium 



Mandible. 



TABLE 13 

 List of bones 



Nasals 2 



Premaxillae 2 



Maxillae 2 



Jugals. .., 2 



Palatines 2 



Vomer 1 



Lachrymals 2 



Ethmoid 1 



Frontals 2 



Sphenoid 1 



Presphenoid 1 



Parietals 2 



Squamosals 2 



Interparietal 1 



Occipital 1 



Periotic capsules 2 



Tympanic bones 2 



f Malleus 2 



Ear 



< Incus 2 



bones a . 



{ Stapes 2 



2 



Teeth... . 16 



Hyoid. 



Cervical 7 



Dorsal or thoracic 13 



Vertebrae Lumbar 6 



Sacral 4 



Caudal (about) 30 



{Vertebro-sternal 14 



Vertebro-costal 6 



Vertebral... 6 



Sternum.. 6 



Shoulder f Scapula, 

 girdle \ Clavicle. 



[ Carpus IS 



Fore feet I Metacarpus. 10 



( Phalanges. . 28 



Femur 2 



Tibia 2 



Fibula. . 2 



Sesamoid 

 bones 



Hind feet 



Patellae.... 

 2 back of 

 Femur. .. 



Tarsus 



Metatarsus. 

 Phalanges. . 



16 

 10 



28 



283 



Nails (20) omitted 



First appearance of ossification centers. The first appearance 

 of ossification centers and the later bone changes have been 

 determined by R. M. Strong (MS.) and are given in table 14. 



