Qiya tayanch tirgak
Qiya tayanch tirgak – fermning tayanch tugunini uning ustki belbog’i bilan birlashtiruvchi yuqoriga yo’nalgan tirgak (sterjen).

Qiya tayanch tirgak – fermning tayanch tugunini uning ustki belbog’i bilan birlashtiruvchi yuqoriga yo’nalgan tirgak (sterjen).