Halakhah for Bekhorot 89:59

א"ר יהודה אמר שמואל

or if one<span class="x" onmousemove="('comment',' If a woman is born with two additional fingers on her hands and two additional toes on her legs and each one has six bones, we have a total of twenty-four additional limbs. In addition, there are five extra limbs in the case of a woman, viz. two hinges, two doors and the womb (v. infra) . We have therefore altogether twenty-nine additional limbs. Add this to two hundred and forty-eight, and we have a grand total of two hundred and seventy-seven. Rashi says that he cannot account for the other four so as to make up the number to two hundred and eighty-one. R. Gershom however explains that for every six bones in a finger there is a corresponding extra bone in the arm. Consequently, as there are four additional fingers and toes, we have a further four limbs, which bring the number of joints to two hundred and eighty-one.');">³⁵</span>

Peninei Halakhah, Women's Prayer