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Radiographs of the trunk in 14 phylogenetically diverse species in resting and stretched conditions combined with dissections and histological analysis of intervertebral joints show that the synovial nature of these joints underlies the variance in SVL measures. Similarly, the ubiquity and variety of viscoelastic tissues connecting mobile snout and jaw elements of alethinophidian snakes underlie variances in length and width measures of the head. For the overall size of the head and jaw apparatus, the part that can be most easily and relatively precisely measured for many snakes is the mandible because it has only one mobile joint. As to accuracy, the anatomy of intervertebral and cranial joints supports the hypothesis that in living snakes, the head and trunk have no exact size.<\/jats:p>","DOI":"10.1002\/jmor.21758","type":"journal-article","created":{"date-parts":[[2024,8,8]],"date-time":"2024-08-08T09:36:00Z","timestamp":1723109760000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["How anatomy influences measurements of snakes"],"prefix":"10.1002","volume":"285","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0527-1259","authenticated-orcid":false,"given":"David","family":"Cundall","sequence":"first","affiliation":[{"name":"Department of Biological Sciences Lehigh University Bethlehem Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5115-6089","authenticated-orcid":false,"given":"Alexandra","family":"Deufel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abigail","family":"Pattishall","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,8,8]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1093\/icb\/23.2.347"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.5962\/bhl.part.4641"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/jzo.12914"},{"issue":"1","key":"e_1_2_9_5_1","first-page":"1","article-title":"The corrected lengths of two well\u2010known giant pythons and the establishment of a new maximum length record for Burmese pythons, Python bivittatus","volume":"47","author":"Barker D. 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