Summary
The purpose of the study is to describe some rare and hitherto unreported uni- and bilateral anomalies of the orbital rectus muscles (duplication, triplication, accessory bellies, interrectal muscular bridges, false insertion) which were found by chance during the dissections of three cadavers (one adult, two fetuses). The levator palpebrae superioris muscles in the same specimens exhibited some variations (medial and lateral muscular slips) and anomalies (bipartite and unipartite levator). Cross-sections of interrectal bridges in the orbit of an adult were investigated histologically. Numerous nerves were distributed in the interstitium; groups of lipofuscin granules were found in all the myocytes. An attempt is made to explain these anomalies and variations through consideration of developmental and comparative anatomy. The relevance of these anomalies in coronal sections such as those acquired from CT and MRI is discussed.
Résumé
L'objet de cette étude est de décrire quelques anomalies uni et bilatérales des muscles droits orbitaires rares et jusqu'ici non rapportées (duplication, triplication, corps musculaires accessoires, ponts musculaires entre les muscles droits, fausse insertion) qui ont été trouvées par hasard au cours de dissections de 3 cadavres (un adulte et deux foetus). Les muscles releveurs de la paupière de ces individus présentaient quelques variations (bandelettes musculaires médiale et latérale) et anomalies (releveur dédoublé et unique). Des coupes des ponts intermusculaires de l'orbite d'un adulte ont été étudiées histologiquement. Un grand nombre de nerfs est distribué dans l'interstitium ; des groupes de granules de lipofuscine ont été retrouvés dans tous les myocytes. Une tentative pour expliquer les anomalies et les variations à partir de considérations sur l'anatomie développementale et comparative est faite. On cosidèrera également comment ces anomalies peuvent apparaître dans des coupes coronales telles que celles obtenues par CT scanner et IRM.
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von Lüdinghausen, M., Miura, M. & Würzler, N. Variations and anomalies of the human orbital muscles. Surg Radiol Anat 21, 69–76 (1999). https://doi.org/10.1007/BF01635057
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DOI: https://doi.org/10.1007/BF01635057