Brandon,
§R802.8 Lateral support. Rafters and ceiling joists having a depth-to-thickness ratio exceeding 5 to 1 based on nominal dimensions shall be provided with lateral support at points of bearing to prevent rotation.
(That's a 2X12 or larger, a 2X10 or smaller does not exceed the 5 to 1 ratio.)
§R802.8.1 Bridging. Rafters and ceiling joists having a depth-to-thickness ratio exceeding 6 to 1 based on nominal dimensions shall be supported laterally by solid blocking, diagonal bridging (wood or metal) or a continuous 1-inch by 3-inch (25.4 mm by 76 mm) wood strip nailed across the rafters or ceiling joists at intervals not exceeding 8 feet (2438 mm).
(That's a 2X14 or larger, a 2X12 or smaller does not exceed the 6 to 1 ratio.)
I know you know that, I'm just pointing it out for all as the joists in the photo do not appear to exceed those ratios.