. Practical anatomy of the rabbit : an elementary laboratory textbook in mammalian anatomy . Rabbits; Anatomy, Comparative. o Anatomy of the Rabbit. The way in which bones are formed on a cartilage basis serves to xplaih many pecuHarities of the adult skeleton. In the embryonic ondition the cartilage rudiments are associated to form a com- lete but primitive skeleton. In many cases the replacement of base elements by bone is not direct, certain readjustments being ecessary, both for purposes of growth and on account of the much lore special functional requirements of the adult skeleton. In the
. Practical anatomy of the rabbit : an elementary laboratory textbook in mammalian anatomy . Rabbits; Anatomy, Comparative. o Anatomy of the Rabbit. The way in which bones are formed on a cartilage basis serves to xplaih many pecuHarities of the adult skeleton. In the embryonic ondition the cartilage rudiments are associated to form a com- lete but primitive skeleton. In many cases the replacement of base elements by bone is not direct, certain readjustments being ecessary, both for purposes of growth and on account of the much lore special functional requirements of the adult skeleton. In the embryonic condition the cartilage rudiments are en- losed by a connective tissue sheath, equivalent to the periosteum f a bone, but described as the perichondrium. The osteoblasts f this layer are concerned with the formation of bone material, oth in the interior (endochondral bone) and on the surface .ntramembranous bone). The formation of endochrondral bone is preceded by certain changes which take place in the interior of the cartilage. In the latter, in certaifi areas, known as the centres of ossifi- cation, the matrix becomes partly '. rru. dissolved, the cells enlarged and ultimately broken down. These changes are associated with a deposi- tion of calcareous material, or calci- FiG. II. Outline sketch of the prox- i-ii al end of the femur of a young IlCatlOn, by whlCh the portlOn of the imal: , principal epiphysis for the .. ' , . ^ ad of the femur. The accessory Cartilage Undergoing transformation iphyses are for the great (), . ., i i t ser (), and third () tro- IS temporarily strengthened. Into inters. , . , . ,, ,- , this area the active cells of the ;richondrium are carried through the agency of vascular in- -owths, the periosteal buds, and the result of their presence is le deposition of bone material in association with the remaining jrtions of the matrix. This condition is partly illustrated in the istal epiphysis of the humerus shown
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectanatomy, bookyear1921
