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Between the ninth and seventeenth days of incubation the number of cells in the normal trochlear nucleus declines from just under 1400 to a little under 700, indicating a cell loss of approximately 50% over this eight day interval. From the seventeenth day onwards there is a further slight fall to between 500 and 600 cells and this number is maintained into the third month after hatching. Following excision of the optic vesicle there is an earlier, and more severe, loss of neurons in the trochlear center, the number of cells being reduced to just under 1000 at the eleventh day of incubation and falling to just over 300 by the sixth day after hatching. Despite this marked cell loss, at no stage is there any gross evidence of neuronal disintegration or phagocytosis. The possible factors responsible for the normally occurring cell loss and for the hypoplasia in the trochlear nucleus after removal of the optic vesicle are discussed.<\/jats:p>","DOI":"10.1002\/jez.1401640210","type":"journal-article","created":{"date-parts":[[2005,6,11]],"date-time":"2005-06-11T14:18:44Z","timestamp":1118499524000},"page":"267-279","source":"Crossref","is-referenced-by-count":129,"title":["Cell loss in the trochlear nucleus of the chick during normal development and after radical extirpation of the optic vesicle"],"prefix":"10.1002","volume":"164","author":[{"given":"W. M.","family":"Cowan","sequence":"first","affiliation":[]},{"given":"Eleanor","family":"Wenger","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2005,6]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/ar.1090940210"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/jez.1400930106"},{"key":"e_1_2_1_4_1","first-page":"212","article-title":"Spontaneous degeneration in the spinal cord of monkey fetuses","volume":"119","author":"Bodian D.","year":"1966","journal-title":"Bull. Hopkins Hosp."},{"key":"e_1_2_1_5_1","first-page":"63","volume-title":"Structure and Function of Muscle","author":"Boyd J. D.","year":"1960"},{"key":"e_1_2_1_6_1","unstructured":"y Cajal S. Ram\u00f3nandF.De Castro 1933Elementos de Tecnica Micrografica del Sistema Nervioso Tipografia Artistica Madrid."},{"key":"e_1_2_1_7_1","first-page":"185","article-title":"R\u00e9cherches cytologiques sur le developpment de la cellule nerveuse","volume":"8","author":"Collin R.","year":"1906","journal-title":"Le N\u00e9vraxe"},{"key":"e_1_2_1_8_1","unstructured":"Cowan W. M.andE.Wenger1967An experimental study of the development of the avian visual system. In preparation."},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/cne.900980109"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF02118264"},{"key":"e_1_2_1_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF02117845"},{"key":"e_1_2_1_12_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF02118704"},{"key":"e_1_2_1_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-185X.1951.tb00774.x"},{"key":"e_1_2_1_14_1","first-page":"111","article-title":"The formation of new motor endplates in mammalian skeletal muscle","volume":"100","author":"Gwyn D. G.","year":"1966","journal-title":"J. Anat. 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