Trapezius aplasia: indications for a dual developmental origin of the trapezius muscle.
Aplasia of the trapezius muscle is a rarely encountered, mostly asymptomatic anomaly. We report a case of isolated unilateral complete trapezius aplasia that was noticed during a dissection course. Apart from isolated cases, trapezius aplasia may occur in different combinations with other muscle aplasias. We suggest that the patterns of concomitant muscle involvement are indicative of a combined occipital and cervical somitogenic origin.
Department of Anatomy and Embryology, Academic Medical Center, University of Amsterdam, The Netherlands.
Linda S
LS
Nooij
Roelof-Jan
RJ
Oostra
D000368:Aged; D000715:Anatomy / Q000193:education; D001415:Back / Q000473:pathology*; D005260:Female; D006801:Humans; D018485:Muscle Fibers, Skeletal / Q000473:pathology; D018482:Muscle, Skeletal / Q000002:abnormalities* / Q000254:growth & development / Q000473:pathology*