Ronda Rousey revealed just how seriously her neurological issues affected her during her stunning loss to Holly Holm that began her UFC downfall and eventual MMA exit. The 39-year-old Rousey, who will return to sport to face fellow legend Gina Carano in the main event of Netflix’s first MMA card on Saturday, went into detail about exactly what she was going through during her knockout loss to Holm in 2015 that cost her the UFC women’s bantamweight title and undefeated record. She said during an interview with Uncrowned’s Ariel Helwani on Monday that he didn’t truly understand the neurological issues she was dealing with for an extended period of time and they finally caught up with her against Holm.  Ronda Rousey at a press conference for Most Valuable Promotions. Kyle Stevens/Shutterstock The effects set in the very first time she was hit in the bout and included knocking all her lower teeth loose and cutting her lip.…