Adam Clarke on Job 41:22

In his neck remaineth strength - Literally, "strength has its dwelling in his neck." The neck is the seat of strength of most animals; but the head and shoulders must be here meant, as the crocodile has no neck, being shaped nearly like a lizard.

And sorrow is turned into joy before him - ולפניו תדוץ דאבה ulephanaiv taduts deabah; "And destruction exulteth before him." This is as fine an image as can well be conceived. It is in the true spirit of poetry, the legitimate offspring of the genie createur. Our translation is simply insignificant.