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Branchiomerism and the theory of head segmentation
Author(s) -
Kingsbury B. F.
Publication year - 1926
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1050420104
Subject(s) - biology , anatomy , segmentation , mesoderm , branchial arch , dorsum , embryo , genetics , embryonic stem cell , computer science , artificial intelligence , gene
The summary of this paper is as follows:1 A critical review of the developmental evidence shows that the branchial pouches are formed in cephalocaudal sequence subsequently to the segmentation of the dorsal mesoderm. 2 The pouches interrupt a continuous sheet of mesoderm to form the branchial arches. 3 The arches when formed do not correspond topographically to the dorsal somites. 4 Branchiomerism does not therefore coincide with somitic metamerism. 3 The branchial structures do not support the theory of head segmentation. 3 The nervi trigeminus, facialis, glossopharyngeus, and vagus cannot be regarded as segmental nerves. 3 There is no evidence that branchial pouches or arches have been elided from the series. 3 The problem of meristic homology is briefly discussed.