Brachydactyly Type A1 Abnormal shortness of the fingers and toes. Inheritad as an autosomal dominant trait. Symptoms: extra carpals, short phalanges, short thumbs, short metacarpals, syphalangism of the fingers and 2nd and 3rd toes, short femurs, and sometimes ansent phalanges. Fatal during infancy because of major skeletal defects.