 explanation the sheikh mentioned two benefits of this bone one of them is that the upper arm is attached to it. if it were attached to the chest by something other than this bone or something that takes its place the hand would lose its ability to move and the space between the hands would become narrow so it would not be able to move in all directions.
الشرح قد ذكر الشيخ لهذا العظم منفعتين إحداهما أن يتعلق به العضد، فإنه لو علق بالصدر بغير هذا العظم وما يقوم مقامه، فقدت اليد سلالة الحركات، وضاق ما بين اليدين فلم تجد حركاتها إلى جميع الجهات.