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Encyclopedia > Sagittal crest
Canine skull showing sagittal crest
Canine skull showing sagittal crest

A sagittal crest is a ridge of bone running lengthwise along the midline of the top of the skull (at the sagittal suture) of many mammalian and reptilian skulls, among others. The presence of this ridge of bone indicates that there are exceptionally strong jaw muscles. The sagittal crest serves primarily for attachment of the temporalis muscle, which is one of the main chewing muscles. Development of the sagittal crest is thought to be connected to the development of this muscle. A sagittal crest usually develops during the childhood of an animal in conjunction with the growth of the temporalis muscle, as a result of convergence and gradual heightening of the temporal lines. A sagittal crest tends to be present on the skulls of adult animals that rely on powerful biting and clenching of their teeth, usually as a part of their hunting strategy. Skulls of some dinosaur species, including Tyrannosaurs, possessed well developed sagittal crests. Among mammals, dogs, cats, lions, and many other carnivores have sagittal crests, as do some leaf eaters, including tapirs and some apes. Image File history File linksMetadata CanineSkull. ... Image File history File linksMetadata CanineSkull. ... It has been suggested that temporal fenestra be merged into this article or section. ... The sagittal suture (sutura sagittalis) is a dense, fibrous connective tissue joint between the two parietal bones of the skull. ... Orders Multituberculata (extinct) Palaeoryctoides (extinct) Triconodonta (extinct) Subclass Australosphenida Ausktribosphenida Monotremata Subclass Eutheria (excludes extinct ancestors) Afrosoricida Anagaloidea (extinct) Arctostylopida (extinct) Artiodactyla Carnivora Cetacea Chiroptera Cimolesta (extinct) Cingulata Creodonta (extinct) Condylarthra (extinct) Dermoptera Desmostylia (extinct) Dinocerata (extinct) Embrithopoda (extinct) Hyracoidea Insectivora Lagomorpha Leptictida (extinct) Litopterna (extinct) Macroscelidea Mesonychia (extinct) Notoungulata... The temporalis muscle is one of the muscles of mastication. ...


Sagittal crests are found in robust great apes, and in many of mankind's ancestors (Paranthropus). Prominent Sagittal crests are found among male gorillas and Orangutans, and, with the notable exception of the prominent crests of the particularly robust Bili Ape, do occur but only rarely in male chimpanzees. Genera Subfamily Ponginae Pongo - Orangutans Gigantopithecus (extinct) Sivapithecus (extinct) Subfamily Homininae Gorilla - Gorillas Pan - Chimpanzees Homo - Humans Paranthropus (extinct) Australopithecus (extinct) Sahelanthropus (extinct) Ardipithecus (extinct) Kenyanthropus (extinct) Pierolapithecus (extinct) (tentative) The Hominids (Hominidae) are a biological family which includes humans, extinct species of humanlike creatures and the other great apes... Species †Paranthropus aethiopicus †Paranthropus boisei †Paranthropus robustus The robust australopithecines, members of the extinct hominin genus Paranthropus, were bipedal hominins that probably descended from the gracile australopithecine hominins (Australopithecus). ... Species Gorilla gorilla Gorilla beringei The gorilla, the largest of the primates, is a ground-dwelling herbivore that inhabits the forests of central Africa. ... For the chess opening, see Sokolsky Opening. ... This article or section may contain original research or unverified claims. ... Type Species Simia troglodytes Blumenbach, 1775 Species Pan troglodytes Pan paniscus Chimpanzee, often shortened to chimp, is the common name for the two extant species in the genus Pan. ...


The largest sagittal crest ever discovered in the human lineage belongs to the 'Black Skull', Paranthropus aethiopicus field number KNM WT 17000, the earliest known robust hominid ancestor and the oldest robust australopithecine discovered to date. The prominence of the crest appears to have been an adaptation for the aethiopicus's heavy chewing, and the Black Skull's cheek teeth are correspondingly large. Smaller sagittal crests are also present on the skulls of other Paranthropines, including Paranthropus boisei and Paranthropus robustus. Binomial name †Paranthropus aethiopicus (Olson, 1985) Paranthropus aethiopicus is an extinct species of Paranthropus. ...


See also

Trinomial name Gorilla berengei berengei Matschie, 1914 The Mountain Gorilla (Gorilla beringei beringei) is one of two subspecies of Eastern Gorillas. ... Binomial name †Paranthropus aethiopicus (Olson, 1985) Paranthropus aethiopicus is an extinct species of Paranthropus. ... A 19th century Phrenology chart Phrenology (from Greek: φρήν, phrēn, mind; and λόγος, logos, knowledge) is a theory which claims to be able to determine character, personality traits, and criminality on the basis of the shape of the head (reading bumps). Developed by German physician Franz Joseph Gall around 1800, and... The Sagittal Keel (torus) is a thickening of bone on part or all of the midline of the frontal, or parietals where they meet sagittally, or both bones. ...

External link

  • ArcheologyInfo.com - 'Black Skull' (Australopithecus aethiopicus, specimen KNM-WT 17000)

  Results from FactBites:
 
sagittal crest (154 words)
The presence of a sagittal crest indicates that there are exceptionally strong jaw muscles.
Some Australopithecus afarensis and the robust australopithecines (Australopithecus robustus, boisei, and aethiopicus) had sagittal crests.
Among the living primates, the most prominent sagittal crests are found on adult male gorillas.
Sagittal crest - Wikipedia, the free encyclopedia (346 words)
A sagittal crest is a ridge of bone running lengthwise along the midline of the top of the skull (at the sagittal suture) of many mammalian and reptilian skulls, among others.
A sagittal crest usually develops during the childhood of an animal in conjunction with the growth of the temporalis muscle, as a result of convergence and gradual heightening of the temporal lines.
A sagittal crest tends to be present on the skulls of adult animals that rely on powerful biting and clenching of their teeth, usually as a part of their hunting strategy.
  More results at FactBites »

 
 

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