The intrinsic flexors of the fingers are innervated by the ulnar nerve, while the extrinsic flexors are split between the median nerve and other nerves more proximally.

“the the intrinsic flexors or ulnar the extra intrinsics are split between the median more approximately in the form or split between the median”

“the ulnar nerve supplies almost all the rest of the muscles small muscles of the hand and those we call the intrinsic muscles of the hand which are basically what allow us to spread our fingers apart pull our fingers together do these weird funky positions that we do like the intrinsic plus position”

“which you don't that doesn't affect the ulnar nerve which is the other nerve that we're talking about the ulnar nerve is so important because while our opposable thumb is critically important that's governed mostly by the by the median nerve the ulnar nerve supplies almost all the rest of the muscles small muscles of the hand and those we call the intrinsic muscles of the hand which are basically what allow us to spread our fingers apart pull our fingers together do these weird funky positions that we do like the intrinsic plus position”