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A Practical Approach, Second Edition=Ronald D. Ho.pdf

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Terminology of developmental abnormalities in common laboratory mammals (version 1): Skeletal abnormalities 1 (continued)Region/Organ/StructureVertebra,GeneralCodeNumberObservation10637 Short rib Rudimentary Not used forsupernumerary rib;generally less than halfnormal length10638 Short supernumeraryribExtra rudimentary,Rudimentarysupernumerarythoracolumbar, ShortsupernumerarythoracolumbarLumbar ribAn extra rib that is usually roundeddistally and without cartilaginousextensionsGenerally the normalnumber of rib pairs is 13in rodent and 12 or 13 inrabbit; but must berelated to normal numberfor given species, strain,and time in eachlaboratory10639 Thickened rib Clubbed10640 Unossified rib10641 Wavy rib Undulation(s) along the length of a rib10642 Absent vertebra Agenesis, Aplastic Used when subregion notspecified10643 Supernumerary Additional, ExtraUsed when subregion notvertebraspecifiedCervical arch 10644 Absent cervical arch Agenesis, Aplastic Atlas = #1, Axis = #210645 Fused cervical arch Specify structures that arefused Atlas = #1,Axis = #210646 Incomplete ossification Reduced ossification Atlas = #1, Axis = #2of cervical arch10647 Malpositioned cervical Displaced, Ectopic Atlas = #1, Axis = #2arch10648 Misaligned cervicalarchAtlas = #1, Axis = #210649 Misshapen cervicalarchSynonym orRelated TermAbnormally shaped,Asymmetric, IrregularlyshapedNon-preferredTerm Definition NoteAtlas = #1, Axis = #210650 Small cervical arch Hypoplastic, Reduced,Atlas = #1, Axis = #2Rudimentary10651 Supernumerarycervical archAdditional, Extra Atlas = #1, Axis = #2952 DEVELOPMENTAL REPRODUCTIVE TOXICOLOGY: A PRACTICAL APPROACH, SECOND EDITION© 2006 by Taylor & Francis Group, LLC

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