The antecedent (muqaddam) is the proposition introduced as the condition; the consequent (tālī) is what is connected to it. These names reflect their logical roles, not simply the number of words before and after a pause.
«إن كان زيد إنسانا كان حيوانا»
If Zayd is human, he is an animal.
Antecedent: Zayd is human.
Consequent: Zayd is an animal.
The claim concerns the connection between humanity and animality. Affirming the antecedent and affirming the connection must not be confused.