An adjustable support apparatus 10 includes tower assembly 28 associated with first end support at the head end of surgery table 12. Tower assembly 28 includes a crossbar or mount 40 which is connected directly to and forms a part of first end support 14. Crossbar 40 orients towers 42 and 44 outwardly therefrom and in a generally vertical orientation. Tower assembly 28 also possesses carriages 46 and 48 that move along towers 42 and 44 via a ratchet mechanism. Tower 42 includes an inner open chamber 82 which hold gear racks 84 and 86. Carriage 46 includes a pawl mechanism 88
