Two cases with anomalous fascicles in abductor digiti minimi, noted in
the course of dissecting 62 adult postmortem forearms, are described.
Both fascicles arose from the flexor retinaculum and the antebrachial
fascia; one was inserted into abductor digiti minimi and the other on
the proximal phalanx of the 5th finger. The anomalous muscles crossed
the ulnar nerve and in 1 case also the median nerve. In the 2nd case
the palmar nerve to the 5th finger was seen to penetrate the anomalous
muscle. The ontogeny, morphology and clinical significance of this an
omaly are discussed in relation to previously described anomalies of t
he hypothenar muscles.