REFERENCES 69 



THE NOTOCHORD. 



A rod of cells, the notochord, forms just dorscal to the primitive 

 gut during the embryonic development of all vertebrates. These 

 cells become distended to a spherical form by a considerable con- 

 tent of fluid and by their turgidity may give some support to the 

 early embryo. The nuclei are small and centrally located. The 

 position of the nuclei and the spherical shape of these cells help 

 to distinguish them from fat cells, which they resemble in routine 

 preparations. This tissue is supplanted by cartilaginous tissue 

 forming from mesenchyme in the surrounding region. 



REFERENCES. 



Arey, I.. B. 1932. Certain basic principles of wound healing, Anat Rec 



51, 299. 

 AscHOFF, L. 1924. Reticulo-endothelial System: Lecture.s on Pathology, 



New York, Paul B. Hoeber, Inc. 

 Bensley, S. H. 1934. On the presence, properties and distribution of the 



intercellular ground substance of loose connective tissue, Anat. Rec, 60, 93. 

 Carrel, A., and Ebeling, A. 1926. Fibroblast and macrophage. Jour Exp 



Med., 44, 261, 285. 

 Dawson, H. B. 1934. Further studies on epiphyseal union in the skeleton of 



the rat, Anat. Rec, 60, 83. 

 DoDDS, G. S. 1932. Osteoclasts and cartilage removal in endochondral ossi- 



cation of certain mammals, Am. Jour. Anat., 50, 97. 

 Fr.\n§ois-Franck, L., Back, A., and Faure-Fremiet, E. 1932. Etude 



microcincmatographique du mesenchyme des salmonides, Compt. rend. 



Assn. anat., 27, 284. 

 Ham, a. W. 1931. The variabihty of the planes of cell division in the cartilage 



columns of the growing epiphyseal plate, Anat. Rec, 51, 125. 

 Key, J. A. 1928. The cytology of the synovial fluid of normal joints, Anat. 



Rec, vol. 40. 

 Lewis, W. H. 1922. Is mesenchyme a syncytium? Anat. Rec, vol. 23, 177. 

 Rice, H. G., and Jackson, C. M. 1934. The histological distribution of fats 



in the liver, kidney, trachea, lung and skin of the rat at various postnatal 



stages, Anat. Rec, 59, 135. 

 Ruth, E. B. 1934. The Os Priapi: A study in bone development, Anat. 



Rec, 60, 231. 

 Singer, E. 1933. Structure and relations of the leucophores of Rana pipiens 



as revealed by the ultra-violet and fluorescent light, Anat. Rec, 58, 93. 

 Summer, F. B., and Wells, N. A. 1933 The effects of optic stimuli upon the 



formation and destruction of melanin pigment in fishes. Jour. Exp Zool 



64, 377. 



See Appendix for general text references. 



