Anomalous muscle belly to the index finger.
An unusual variation of flexor digitorum superficialis was observed during the cadaver dissection. The flexor digitorum superficialis (FDS) had a normal origin and insertion, except to the index finger, where a muscle belly replaced the tendon of FDS. The unusual muscle belly originated as a continuation of FDS tendon in the carpal tunnel and inserted normally into the middle phalanx. A branch of the median nerve innervated the anomalous muscle belly. The anomalous muscle belly described here should be considered in the aetiology of carpal tunnel syndrome.
D'Costa
Sujatha
S
Department of Anatomy, Centre for Basic Sciences, Kasturba Medical College, Mangalore, Karnataka, India.
Jiji
Nayak
Soubhagya R
SR
Sivanadan
R
R
Abhishek
D002102:Cadaver; D004210:Dissection; D005385:Fingers / Q000033:anatomy & histology*; D005542:Forearm; D006801:Humans; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000002:abnormalities* / Q000033:anatomy & histology*; D013710:Tendons / Q000033:anatomy & histology*