Figure 5 in Functional morphology of neck musculature in the Tyrannosauridae (Dinosauria, Theropoda) as determined via a hierarchical inferential approach

Figure 5. Attachments of muscles inserting on the occiput of birds. A, posterior cervical vertebrae of Strutio camelus, showing osteological origin of posterior belly of m. biventer cervicis. B, anterior cervical vertebrae of Haliaeetus leucocephalus, with origins of m. complexus, m. splenius capitis and m. rectus capitis dorsalis (outlined). M. complexus originates from the epipophyses dorsally (as in Haliaeetus leucocephalus), and sometimes the lateral tubercles ventrally. For adjoining origins of m. complexus and m. rectus capitis dorsalis from the lateral tubercles, the latter is the anterior of each pair. C, occiput of Struthio camelus, depicting all insertions. In Struthio camelus and many other birds m. splenius capitis lateralis inserts laterally onto the occiput, but in other birds part of m. complexus inserts here.