'Shoulders' in the Bible

So Shem and Japheth took a robe and put it on both their shoulders, and walked backwards and covered the nakedness of their father; their faces were turned away so that they did not see their father’s nakedness.

So Abraham got up early in the morning and took bread and a skin of water and gave them to Hagar, putting them on her shoulder, and gave her the boy, and sent her away. And she left [but lost her way] and wandered [aimlessly] in the Wilderness of Beersheba.

Then Abraham took the wood for the burnt offering and laid it on [the shoulders of] Isaac his son, and he took the fire (firepot) in his own hand and the [sacrificial] knife; and the two of them walked on together.