Figure 3. Reconstruction of pneumatic diverticula around the cervical vertebrae of different sauropods. 3.1. Lateral view of cervical vertebrae of Patagosaurus, Apatosaurus and Brachiosaurus, with similar distribution of main pneumatic diverticula (for abbreviations, see "Results"). Possible distribution of pneumatic diverticula throughout the neck of sauropods, provided that pneumatic diverticula extended beyond their bony boundaries at the vertebral surface, 3.2. Tripartite configuration with schematic cross-section as in Apatosaurus, note that large SVDv are in contact with dorsal ligaments of the neck, 3.3. Dual configuration with schematic cross-section as in Brachiosaurus, note that SVDv are small and separate, but also in contact with dorsal ligaments of the neck. Not to scale.