Neanderthal anatomy

Neanderthal Temporal range: Middle to Late Pleistocene, 0.6–0.03 Ma PreЄ Є O S D C P T J K Pg N ↓
Mounted Neanderthal skeleton, American Museum of Natural History
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Primates
Family:	Hominidae
Genus:	Homo
Species:	H. neanderthalensis
Binomial name
Homo neanderthalensis King, 1864
Synonyms
Palaeoanthropus neanderthalensis[citation needed] H. s. neanderthalensis

Neanderthal anatomy was more robust than modern humans. Neanderthals were generally only 12–14 cm (5–6 in) shorter than 21st century humans, contrary to a common view of them as "very short" or "just over 5 feet". Based on 45 long bones from (at most) 14 males and 7 females, Neanderthal males averaged 164–168 cm (65–66 in) and females 152–156 cm (60–61 in) tall.^[1] An example of sample of 26 specimens in 2010 found an average weight for males of 77.6 kg for males and 66.4 kg for females.^[2]

Neanderthals had more robust build and distinctive morphological features, especially of the cranium, which gradually accumulated more derived aspects, particularly in certain relatively isolated geographic regions. Evidence suggests they were much stronger than modern humans;^[3]

A 2007 study suggested some Neanderthals may have had red hair and pale skin color.^[4][5]

Distinguishing physical traits

Ashley Montagu claimed humans have more neotenized skulls than Neanderthals.^[6]

Neanderthal cranial anatomy

Neanderthal footprint in the Natural History Museum in Prague

A reconstruction of a Neanderthal male at Zagros Paleolithic Museum

The magnitude of autapomorphic traits in specimens differ in time. In the latest specimens, autapomorphy is unclear. The following is a list of physical traits that distinguish Neanderthals from modern humans. However, not all of them distinguish specific Neanderthal populations from various geographic areas, evolutionary periods, or other extinct humans. Also, many of these traits occasionally manifest in modern humans, particularly among certain ethnic groups traced to Neanderthal habitat ranges.^{[citation needed]} Nothing is certain (from unearthed bones) about the shape of soft parts such as eyes, ears, and lips of Neanderthals.^[7] While the structure of the head and face were not very far removed from those of modern humans, there were still quite noticeable differences. Notably the Neanderthal head was shorter and with a less pronounced facial front. Chin and forehead sloped backwards and the nose region protruded forward more than in modern humans. The common shapes of the nose are not known but in general it was likely more robust, and possibly slightly larger, than in modern humans. The brain space of the skull, and so most likely the brain itself, were larger than in modern humans.

When comparing traits to worldwide average present day human traits in Neanderthal specimens, the following traits are distinguished. The magnitude on particular trait changes with 300,000 years timeline. The large number of classic Neanderthal traits is significant because extreme examples of Homo sapiens sapiens may sometimes show one or more of these traits, but not most or all of them.

• Cranial
  • Suprainiac fossa, a groove above the inion
  • Occipital bun, a protuberance of the occipital bone, which looks like a hair knot^[8]
  • Projecting mid-face
  • less neotenized skull than humans^[6]
  • Low, flat, elongated skull
  • A flat basicranium^[9][10][11]
  • Supraorbital torus, a prominent, trabecular (spongy) brow ridge
  • 1,200–1,900 cm³ (73–116 cu in) skull capacity
  • Lack of a protruding chin (mental protuberance; although later specimens possess a slight protuberance)
  • Crest on the mastoid process behind the ear opening
  • No groove on canine teeth
  • A retromolar space posterior to the third molar
  • Bony projections on the sides of the nasal opening, projecting nose
  • Distinctive shape of the bony labyrinth in the ear
  • Larger mental foramen in mandible for facial blood supply
• Sub-cranial
  • Considerably more robust, stronger build
  • Long collar bones, wider shoulders
  • Barrel-shaped rib cage
  • Short, bowed shoulder blades
  • Larger round finger tips
  • Large kneecaps
  • Thick, bowed shaft of the thigh bones, bowed femur
  • Short shinbones and calf bones, longer torso and proportionally shorter legs
  • Long, gracile pelvic pubis (superior pubic ramus)

Pathology

Within the west Asian and European record, there are five broad groups of pathology or injury noted in Neanderthal skeletons.

Fractures

Neanderthals seemed to suffer a high frequency of fractures, especially common on the ribs (Shanidar IV, La Chapelle-aux-Saints 1 ('Old Man'), the femur (La Ferrassie 1), fibulae (La Ferrassie 2 and Tabun 1), spine (Kebara 2) and skull (Shanidar I, Krapina, Sala 1). These fractures are often healed and show little or no sign of infection, suggesting that injured individuals were cared for during times of incapacitation. It has been remarked that Neanderthals showed a frequency of such injuries comparable to that of modern rodeo professionals, showing frequent contact with large, combative mammals. The pattern of fractures, along with the absence of throwing weapons, suggests that they may have hunted by leaping onto their prey and stabbing or even wrestling it to the ground.^[12]

Cold-adapted theory

Some people thought that the large Neanderthal noses were an adaptation to the cold,^[13] but primate and arctic animal studies have shown sinus size reduction in areas of extreme cold rather than enlargement in accordance with Allen's rule.^[14] Todd C. Rae summarizes explanations about Neanderthal anatomy as trying to find explanations for the "paradox" that their traits are not cold-adapted.^[14] Therefore, Todd C. Rae concludes that the design of the large and prognathic Neanderthal nose was evolved for the hotter climate of the Middle East and was kept when the Neanderthals entered Europe.^[14] Miquel Hernández of the Department of Animal Biology at the University of Barcelona said the "high and narrow nose of Eskimos" and "Neanderthals" is an "adaption to a cold and dry environment", since it contributes to warming and moisturizing the air and the "recovery of heat and moisture from expired air".^[15]

Trauma

Particularly related to fractures are cases of trauma seen on many skeletons of Neanderthals. These usually take the form of stab wounds, as seen on Shanidar III, whose lung was probably punctured by a stab wound to the chest between the eighth and ninth ribs. This may have been an intentional attack or merely a hunting accident; either way the man survived for some weeks after his injury before being killed by a rock fall in the Shanidar cave. Other signs of trauma include blows to the head (Shanidar I and IV, Krapina), all of which seemed to have healed, although traces of the scalp wounds are visible on the surface of the skulls.

Degenerative disease

Arthritis was common in the older Neanderthal population, specifically targeting areas of articulation such as the ankle (Shanidar III), spine and hips (La Chapelle-aux-Saints 'Old Man'), arms (La Quina 5, Krapina, Feldhofer) knees, fingers and toes. This is closely related to degenerative joint disease, which can range from normal, use-related degeneration to painful, debilitating restriction of movement and deformity and is seen in varying degree in the Shanidar skeletons (I–IV).

Hypoplastic disease

Neanderthal child

Dental enamel hypoplasia is an indicator of stress during the development of teeth and records in the striations and grooves in the enamel periods of food scarcity, trauma or disease. A study of 669 Neanderthal dental crowns showed that 75% of individuals suffered some degree of hypoplasia and that nutritional deficiencies were the main cause of hypoplasia and eventual tooth loss. All particularly aged skeletons show evidence of hypoplasia and it is especially evident in the Old Man of La Chapelle-aux-Saints and La Ferrassie 1 teeth.

Infection

Evidence of infections on Neanderthal skeletons is usually visible in the form of lesions on the bone, which are created by systemic infection on areas closest to the bone. Shanidar I has evidence of the degenerative lesions as does La Ferrassie 1, whose lesions on both femora, tibiae and fibulae are indicative of a systemic infection or carcinoma (malignant tumour/cancer).

Childhood

Neanderthal children may have grown faster than modern human children. Modern humans have the slowest body growth of any mammal during childhood (the period between infancy and puberty) with lack of growth during this period being made up later in an adolescent growth spurt.^[16][17][18] The possibility that Neanderthal childhood growth was different was first raised in 1928 by the excavators of the Mousterian rock-shelter of a Neanderthal juvenile.^[19] Arthur Keith in 1931 wrote, "Apparently Neanderthal children assumed the appearances of maturity at an earlier age than modern children."^[20] The rate of body maturation can be inferred by comparing the maturity of a juvenile's fossil remains and the estimated age of death.

The age at which juveniles die can be indirectly inferred from their tooth morphology, development and emergence. This has been argued to both support^[21] and question^[22] the existence of a maturation difference between Neanderthals and modern humans. Since 2007, tooth age can be directly calculated using the noninvasive imaging of growth patterns in tooth enamel by means of x-ray synchrotron microtomography.^[23]

This research supports the occurrence of much more rapid physical development in Neanderthals than in modern human children.^[24] The x-ray synchrotron microtomography study of early H. sapiens sapiens argues that this difference existed between the two species as far back as 160,000 years before present.^[25]

Footnotes

1. ^ Helmuth H (1998). "Body height, body mass and surface area of the Neanderthals". Zeitschrift Für Morphologie Und Anthropologie 82 (1): 1–12. PMID 9850627. 
2. ^ Froehle, Andrew W; Chruchill, Steven E (2009). "Energetic Competition Between Neandertals and Anatomically Modern Humans" (PDF). PaleoAnthropology: 96–116. http://www.paleoanthro.org/journal/content/PA20090096.pdf. Retrieved 2011-10-31. 
3. ^ "Neanderthal". BBC. http://www.bbc.co.uk/nature/wildfacts/factfiles/459.shtml. Retrieved 18 May 2009. 
4. ^ Laleuza-Fox, Carles; Holger Römpler et al. (2007-10-25). "A Melanocortin 1 Receptor Allele Suggests Varying Pigmentation Among Neanderthals". Science 318 (5855): 1453. doi:10.1126/science.1147417. PMID 17962522. 
5. ^ Rincon, Paul (25 October 2007). "Neanderthals 'were flame-haired'". BBC News. http://news.bbc.co.uk/1/hi/sci/tech/7062415.stm. Retrieved 25 October 2007. 
6. ^ ^{a b} Montagu, A. (1989). Growing Young. Bergin & Garvey: CT.
7. ^ Carey, Bjorn (10 March 2005). "Scientists Build 'Frankenstein' Neanderthal Skeleton". LiveScience. http://www.livescience.com/history/050310_neanderthal_reconstruction.html. Retrieved 18 May 2009. 
8. ^ Gunz, P; Harvati, K (March 2007). "The Neanderthal "chignon": variation, integration, and homology.". Journal of human evolution 52 (3): 262–74. doi:10.1016/j.jhevol.2006.08.010. ISSN 0047-2484. PMID 17097133. http://www.nycep.org/nmg/pdf/21.pdf. 
9. ^ http://www.pajamacore.org/writings/origins.php^{[dead link]}
10. ^ Bower, Bruce (11 April 1992). "Neanderthals to investigators: can we talk? – vocal abilities in pre-historic humans". Science News. http://findarticles.com/p/articles/mi_m1200/is_n15_v141/ai_12140517/. Retrieved 18 May 2009. 
11. ^ Arensburg, B; Schepartz, La; Tillier, Am; Vandermeersch, B; Rak, Y (October 1990). "A reappraisal of the anatomical basis for speech in Middle Palaeolithic hominids.". American Journal of Physical Anthropology 83 (2): 137–46. doi:10.1002/ajpa.1330830202. ISSN 0002-9483. PMID 2248373. 
12. ^ T.D. Berger and E. Trinkaus (1995). "Patterns of trauma among Neadertals". Journal of Archaeological Science 22: 841–852. doi:10.1016/0305-4403(95)90013-6. http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WH8-4FRCV9P-F&_user=994540&_coverDate=11%2F30%2F1995&_fmt=full&_orig=search&_cdi=6844&view=c&_acct=C000050024&_version=1&_urlVersion=0&_userid=994540&md5=a958d2c59d5c6d934e9844f46f275e0e&ref=full. Retrieved 2007-06-28. 
13. ^ Finlayson, C (2004). Neanderthals and modern humans: an ecological and evolutionary perspective. Cambridge University Press. pp. 84. ISBN 0521820871. 
14. ^ ^{a b c} Rae, TC.; Koppe, T.; Stringer, CB. (Feb 2011). "The Neanderthal face is not cold adapted.". J Hum Evol 60 (2): 234–9. doi:10.1016/j.jhevol.2010.10.003. PMID 21183202. 
15. ^ Hernández, M., Fox, C. L. and Garcia-Moro, C. (1997), Fueguian cranial morphology: The adaptation to a cold, harsh environment. American Journal of Physical Anthropology, 103: 103–117. doi: 10.1002/(SICI)1096-8644(199705)103:1<103::AID-AJPA7>3.0.CO;2-X
16. ^ Walker R, Hill K, Burger O, Hurtado AM (April 2006). "Life in the slow lane revisited: ontogenetic separation between chimpanzees and humans". American Journal of Physical Anthropology 129 (4): 577–83. doi:10.1002/ajpa.20306. PMID 16345067. 
17. ^ Bogin, Barry (1997). m682 "Evolutionary hypotheses for human childhood". American Journal of Physical Anthropology 104 (S25): 63–89. doi:10.1002/(SICI)1096-8644(1997)25+<63::AID-AJPA3>3.0.CO;2-8. http://hdl.handle.net/2027.42/37 m682. 
18. ^ Bogin, Barry (1999). Patterns of human growth. Cambridge: Cambridge University Press. ISBN 0-521-56438-7. OCLC 39692257. ^{[page needed]}
19. ^ Garrod, D. A. E., Buxton, L. H. D., Elliot-Smith, G., Bate, D.M. A. (1928). "Excavation of a Mousterian rock-shelter at Devil's Tower, Gibraltar". Journal of the Royal Anthropological Institute 58: 33–113. JSTOR 4619528. 
20. ^ Keith, Arthur (1931). New discoveries relating to the antiquity of man. London: W. W. Norton & Company. p. 346. OCLC 3665578. 
21. ^ Ramirez Rozzi FV, Bermudez De Castro JM (April 2004). "Surprisingly rapid growth in Neanderthals". Nature 428 (6986): 936–9. doi:10.1038/nature02428. PMID 15118725. 
22. ^ Macchiarelli R, Bondioli L, Debénath A, Mazurier A, Tournepiche JF, Birch W, Dean MC (December 2006). "How Neanderthal molar teeth grew". Nature 444 (7120): 748–51. doi:10.1038/nature05314. PMID 17122777. 
23. ^ Tafforeau P, Smith TM (February 2008). "Nondestructive imaging of hominoid dental microstructure using phase contrast X-ray synchrotron microtomography". Journal of Human Evolution 54 (2): 272–8. doi:10.1016/j.jhevol.2007.09.018. PMID 18045654. 
24. ^ Smith TM, Toussaint M, Reid DJ, Olejniczak AJ, Hublin JJ (December 2007). "Rapid dental development in a Middle Paleolithic Belgian Neanderthal". Proceedings of the National Academy of Sciences 104 (51): 20220–5. doi:10.1073/pnas.0707051104. PMC 2154412. PMID 18077342. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2154412. Retrieved 17 May 2009. 
25. ^ Smith TM, Tafforeau P, Reid DJ, Grün R, Eggins S, Boutakiout M, Hublin JJ (April 2007). "Earliest evidence of modern human life history in North African early Homo sapiens". Proceedings of the National Academy of Sciences 104 (15): 6128–33. doi:10.1073/pnas.0700747104. PMC 1828706. PMID 17372199. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1828706. Retrieved 17 May 2009. 

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