This difference, and because the lumbar spines of the extinct Nacholapithecus (a Miocene hominoid with six lumbar vertebrae and no tail) are similar to those of early Australopithecus and early Homo, it is assumed that the Chimpanzee-human last common ancestor also had a long vertebral column with a long lumbar region and that the reduction in the number of lumbar vertebrae evolved independently in each ape clade. The limited number of lumbar vertebrae in chimpanzees and gorillas result in an inability to lordose (curve) their lumbar spines, in contrast to the spines of Old World monkeys and Nacholapithecus and Proconsul, which suggests that the last common ancestor was not "short-backed" as previously believed. Additional images
MRI
Illustrations
See also
Bertolottis syndrome
Spinal disc herniation
Lumbar spinal stenosis
Degenerative disc disease

References
This article incorporates text in the public domain from page 104 of the 20th edition of Grays Anatomy (1918)

External links

"Lower Back Pain Condition, Treatment and Exercise". SpineUniverse. Retrieved February 15, 2017. "Virtual Spine — Online Learning Resource". Toronto Western Hospital Department of Anesthesia and Pain Management. Retrieved February 15, 2017.
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