Preveebral space thickness in adult at C6-C7 level is: (A) 7mm, (B) 15mm, (C) 22mm, (D) 30mm
Answer is C. Upper limits of preveebral space thickness varies with the cervical veebral level in an adult as follows : At C1 level : 10 mm At C2 level : 5 mm At C3 level : 7 mm At C5 level : 22 mm At C6-C7 level : 22 mm