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 < 



TABLE 13 



List of bones 



Nasals 2 Sternum. 



Premaxillae 2 



Maxillae 2 



Jugals 2 



Palatines 2 



Vomer 1 



Lachrymals 2 



Ethmoid 1 



Frontals 2 



Cranium i Sphenoid 1 



Presphenoid 1 



Parietals 2 



Squamosals 2 



Interparietal 1 



Occipital 1 



Periotic capsules 2 



Tympanic bones 2 



Malleus 2 



Incus 2 



Stapes 2 



Mandible 2 



Ear 

 bones 



Teeth 16 



Hyoid. 



Cervical 7 



Dorsal or thoracic 13 



Vertebrae "i Lumbar 6 



Sacral 4 



Caudal (about) 30 



(Vertebro-sternal 14 



Vertebro-costal 6 



Vertebral 6 



Shoulder j Scapula.... 2 



girdle \ Clavicle.... 2 



T, , • f Ilium 2 



Pelvic J T 1,- o 



. ,, < Ischium. ... 2 



^'''^^^ 1 Os pubis... 2 



Humerus 2 



Ulna 2 



Radius 2 



1 Carpus IS 



Metacarpus. 10 



Phalanges. . 28 



Femur 2 



Tibia 2 



Fibula 2 



Sesamoid 

 bones 



Patellae.... 2 

 2 back of 



Femur... 4 



I Tarsus 16 



Hind feet < Metatarsus. 10 

 Phalanges. . 28 



283 



Nails (20) omitted 



First appearance of ossification centers. The first appearance 

 of ossification centers and the later bone changes have been 

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



