Summary
A unifying concept of gross skeletal (neurocranial, neurospinal and appendicular) morphogenesis is proposed. It is based on a close developmental relationship of bone and the nervous tissue, most evident in the neurocranium. The neurospinal developmental interrelationship is modified by the neurovertebral growth differential, which appears to influence the development of spinal curvatures and the gross morphological features of the individual vertebrae. Disproportion in osteoneural growth, as a general biological phenomenon, would be expected to affect the development of the appendicular skeleton. The gross shape of the long bones (physiological curvature and epimetaphyseal widening/‘modelling’) appear to result from a buildup of rapidly forming skeletogenic material adjacent to slower growing nervous trunks, as is the case with the enchondrally developing vertebral body.
Pathological accentuation of vertebro-osteoneural growth disproportion, brought about mainly by inhibition of the vulnerable neural growth, will result in abnormal gross features of the skeleton, i.e., pathological curvatures, terminal or general thickening and shortening of bones, or dislocation of joints. Experimental and clinical deformities, such as idiopathic scoliosis, achondroplastic conditions, congenital dislocation of the hip joint, and some other bone dysplasias confined in their onset and progression to the growth period of life, seem to be related to the suggested mechanism. For the above-mentioned skeletal disorders the term ‘osteoneural growth pathology’ is proposed.
Résumé
On propose une conception unitaire de la morphogénèse normale et pathologique du squelette axial et appendiculaire, à partir des relations les plus étroites existant entre la croissance des systèmes osseux et nerveux; la région neurocraniale en est la manifestation la plus expressive. La disproportion de croissance neuro-vertébrale en longueur exerce une influence décisive sur l'installation des courbures vértébrales physiologiques et sur les caractères morphologiques de chacune des vertèbres, aussi bien dans les dimensions des corps vértébraux que la forme du trou vertébral et des trous de conjugaison. Evoquant un phénomène biologique général, la disproportion de croissance ostéo-neurale agit de même sur le développement du squelette des membres. La forme, c'est-à-dire leurs courbures physiologiques et le modelage de la région épi-métaphysaire peuvent aussi être rattachés à un phénomène ≪d'amassement≫ de tissus osseux proliférant plus rapidement le long des troncs nerveux périphériques.
L'accentuation pathologique de la disproportion de croissance ostéo-neurale, du fait principalement de l'inhibition de la croissance des structures nerveuses peut aboutir à des modifications des parties correspondantes du squelette avec effets de raccourcissement, de courbures pathologiques, d'élargissement partiel ou total et éventuellement, de dislocation articulaire. La conception proposée s'appuie sur des observations expérimentales de croissance ostéo-neurale chez des embryons d'oiseaux et d'amphibiens. On peut expliquer certaines déformations du squelette expérimentales ou cliniques comme la scoliose idiopathique, l'achondroplasie et la dysplasie congénitale de hanche par un même mécanisme d'adaptation des os en croissance à des troubles du développement des structures nerveuses avoisinantes. Une dénomination commune est proposée pour ces troubles de la croissance: ≪pathologie de la croissance relative ostéo-neurale≫.
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Roth, M. The role of relative osteoneural growth in the gross morphogenesis of the skeleton: A hypothesis. Anat. Clin 4, 211–225 (1982). https://doi.org/10.1007/BF01798891
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DOI: https://doi.org/10.1007/BF01798891