<prompt> The following structure does not pass through flexor retinaculurnUlnar N.Median N.Flexor digitorum profundusFlexor digitorum superficialis  <response>: Ulnar nerve Flexor retinaculum F.R.Is a thickening of deep fascia which bridges the ant. concavity of the carpus and conves it into an osteofascial tunnel, the carpal tunnel.Structures passing beneath the flexor retinaculum from medial to lateral are:Flexor digitorum superficialis tendon post. to these flexor digitorum profundus tendonsMedian N.Flexor pollicis longusFlexor carpi radialis 