This is yet another great problem in the lower right sector of the Upper Ghetto, moving left to right across improbably small holds that are rendered usable with crafty heel/toe footwork.
Spina Bifida begins in the bathtub huecos mentioned in the After Hours description (about 30 feet north of the staging area, in the bottom of the slot). You can tack on the sit-start for an extra V-grade.
From the huecos, reel dead right across a series of pimpy slopers and little crimps until you hit a pair of incut letter boxes about 8 feet out. *Don't* continue right into the jugs on Skin Poppin' Slut, rather bust a big move up and left to a sloper, then right hand high over the lip for a hidden incut (the foot jugs out right are also off -- use the little pebble).
Step down or continue along the lip. This is the lowest left to right traverse system in the cave, the upper one on slopey huecos being Ghetto Homos, V3.