Old name, new face: A systematic analysis of flexor digitorum superficialis muscle with “chiasma antebrachii”

MRI-Based Evaluation of the Flexor Digitorum Superficialis Anatomy: Investigating the Prevalence and Morphometry of the “Chiasma Antebrachii”

“…The presented analysis of detailed MR imaging supports and confirms the anatomical description of the chiasma antebrachii as introduced by Ergün et al based on anatomical dissection studies [16]. Our findings regarding the location of the chiasma concur with the observations in cadaveric specimens, as the distance of the tendon intersection to the elbow joint is reported at 220 ± 35 mm, while we measured a median distance of 215 mm.…”

“…They coined this intersection the "chiasma antebrachii". Moreover, the authors provided the first graphical representation of the FDS that enabled a new view of this muscle [16]. Despite the establishment of the term "chiasma antebrachii" as an anatomical reference, it remains unclear whether this tendon intersection represents the standard anatomy or, rather, an uncommon variant.…”

MRI-Based Evaluation of the Flexor Digitorum Superficialis Anatomy: Investigating the Prevalence and Morphometry of the “Chiasma Antebrachii”

“…The presented analysis of detailed MR imaging supports and confirms the anatomical description of the chiasma antebrachii as introduced by Ergün et. al based on anatomical dissection studies [10]. Our findings regarding the location of the chiasma concur with the observations in cadaveric specimens, as the distance of the tendon intersection to the elbow joint is reported with 220 ± 35 mm, while we measured a median distance of 215 mm.…”

“…There are several possible explanations for this incongruity: First, we strictly defined the beginning of the chiasma antebrachii (and therefore our proximal measuring point) as the first axial plane where the FDS/2 tendon was depicted inferiorly to the FDS/3 tendon, whereas Ergün et al measured the distance "from the tendon crossing", rendering an exact comparison difficult. Second, we chose the distal radioulnar joint, a distinct landmark, as our distal measuring point to ensure reproducibility, while the transverse carpal ligament was used in the previous anatomical study [10]. As this ligament with its osseous attachments to the scaphoid and trapezium on the radial side and the pisiform and hamate on the ulnar side lies further distal of the distal radioulnar joint, the differing measurements seem plausible [12].…”

“…They coined this intersection the "chiasma antebrachii". Moreover, the authors provided the first graphical representation of the FDS that enabled a new view on this muscle [10].…”