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A natural endocast of the brain of the Taung Child, a young Australopithecus africanus, with the facial portion of the skull attached

An endocast is the internal cast of a hollow object, often specifically used for an endocasts of the cranial vault.[1] Endocasts can be man-made for examining the properties of a hollow, inaccessible space, or occur naturally through fossilisation.

Cranial endocasts[edit]

Digital cranial endocast of Acrocanthosaurus, an early Cretaceous theropod

Manmade casts[edit]

Endocasts of the inside of the neurocranium (braincase) are often made in paleoanthropology to study brain structures and hemispheric specialization in extinct human ancestors. While an endocast can not directly reveal brain structure,[1] it can allow scientists to gauge the size of areas of the brain situated close to the surface, notably Wernicke's and Broca's areas, responsible for interpreting and producing speech.

Traditionally, the casting material is some form of rubber or rubber-like material. The openings to the brain cavity, except for the foramen magnum, are closed, and the liquid rubber is slushed around in the empty cranial vault and then left to set. The resulting hollow sphere can then be drained of air like a balloon and pulled out through the foramen magnum.[2] Rubber endocasts like these were the standard practice until the end of the 20th century and are still used in some fields. However, scientists are increasingly utilizing computerized tomography scanning technology to create digital endocasts in order to avoid risking damage to valuable specimens.[3]

Natural endocasts[edit]

Natural (fossil) endocast of a Tyrannosaurus cranial vault, showing extensive olfactory bulb (left)

Natural cranial endocasts are also known. The famous Taung Child, the first Australopithecus found, consists of a natural endocast connected to the facial portion of the skull. It was the shape of the brain that allowed Raymond Dart to conclude that the fossil was that of a human relative rather than an extinct ape.[4]

Mammal endocasts are particularly useful, as they resemble the fresh brain with the dura mater in place. Such "fossil brains" are known from several hundred different mammal species.[1] More than a hundred natural cast of the cranial vault of Bathygenys (a small merycodont) alone are known, some having identifiable features down to the major gyri.[5] A natural cranial endocast of a Tyrannosaurus brain vault is also known, showing the animal had limited intelligence, but a well-developed sense of smell.[6] The oldest known natural cranial endocast is a fossil fish brain from a Holocephalan, some 300 million years old.[7]

Endocasts of other hollows[edit]

Endocast of the shell of an Ordovician straight-shelled cephalopod, showing the internal shell structure

Endocasts fossils from animals with shells that easily disintegrate or dissolve, like the aragonite shells of certain molluscs and the tests of sea urchins can often be encountered free from their mold fossil. A frequent form is the internal mold of brachiopods and bivalves. In the quite symmetrical genus brachiopod Pentamerus the endocast resembles a vulva, giving these fossils the name Schamstein or Mutterstein ("shame stone" og "Mother stone") in German, while some bivalve endocasts are traditionally known as heart-of-stone or bull hearts in Britain.[8] The "Venus of Svinesund", a early mesolithic Venus figurine from Norway is a re-worked ordovician bivalve endocast.[9] Endocasts are also known from snail shells and sea urchins, and even from the stomach hollow of jellyfish, a group that rarely leave fossil traces.

Man-made endocasts are sometimes made from blood vessels for medical or anatomical reasons. The blood vessel of an organ (e.g. brain or liver) is injected with a resin. When it is set, the organ itself is dissolved, leaving a three-dimensional image of the blood supply to the organ.


  1. ^ a b c Jerison, H.J. "Paleoneurology: The study of brain endocasts of extinct vertebrates". Comparative Mammalian Brain Collection. University of Wisconsin, Michigan State University, National Museum of Health and Medicine, sponsored by the National Science Foundation. Retrieved 17 November 2011. 
  2. ^ McGowan, Christopher (1991). Dinosaurs, spitfires, and sea dragons (Compl. rev. and updated version of "The successful dragons" ed.). Cambridge, Mass.: Harvard University Press. ISBN 0-674-20769-6. 
  3. ^ Brett-Surman, edited by M. K.; Buchholtz, E.; Jr., Thomas R. Holtz; director, James O. Farlow; Bob Walters, art. The complete dinosaur (2nd ed.). Bloomington, Ind.: Indiana University Press. pp. 191–208. ISBN 978-0-253-00849-7. 
  4. ^ Brain, C.K. Raymond Dart and our African Origins, in A Century of Nature: Twenty-One Discoveries that Changed Science and the World, Laura Garwin and Tim Lincoln, eds.
  5. ^ Wilson, J.A. (1971). "Early Tertiary vertebrate faunas, Vieja Group: Trans- Pecos Texas: Agriochoeridae and Merycoidodontidae". Texas Memorial Museum Bulletin (18): 1–83. 
  6. ^ Australian museum: Tyrannosaurus rex brain
  7. ^ Oldest Fossil Brain Find Is 'Really Bizarre', LiveScience.com
  8. ^ von Werfring, Johan (2015-05-21). "Schamstein-Therapie nach Krötenbiss". Museumsstücke, ProgrammPunkte (Wiener Zeitung). Retrieved 30 July 2015. 
  9. ^ Glørstad, Håkon; Nakrem, Hans Arne; Ørhaug, Vanja (November 2004). "Nature in society: reflections over a Mesolithic sculpture of a fossilised shell". Norwegian Archaeological Review 37 (2): 95–110. doi:10.1080/00293650410014960. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Endocast — Please support Wikipedia.
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95 news items


Wed, 18 Nov 2015 05:18:45 -0800

When lacking soft tissue, as with most fossils, paleontologists use the size of the cranial cavity (the endocast) to elucidate the size of the brain, which obviously can help us infer the relative intelligence or cognition of the organism when ...


Wed, 07 Oct 2015 11:38:05 -0700

This model accompanies an article published in the open-access journal PLOS ONE on 7 October 2015, describing a new titanosaurian dinosaur braincase from the Cretaceous “Lo Hueco” locality in Spain, with an analysis of its brain endocast structure ...


Fri, 09 Oct 2015 12:27:43 -0700

Although the actual brain is gone, the internal cast of the braincase (known as the endocast) where the brain used to be was digitally obtained through CT scanning. This digital reconstruction gave paleontologists the ability to look at the brain size ...

PLoS Blogs (blog)

PLoS Blogs (blog)
Mon, 07 Sep 2015 23:22:40 -0700

Brain endocast of the duck-billed dinosaur Arenysaurus, originally described in a preprint. Brain endocast of the duck-billed dinosaur Arenysaurus, originally described in a preprint prior to formal publication. Despite this, the paleontological ...


Fri, 02 Oct 2015 10:35:50 -0700

The fossil specimens of Rhegmaspis xiphoidea that the paleontologists used to characterize this new genus and species come from multiple individuals and include complete head-shields and one incomplete endocast of a skull. “As a streamlined jawless ...


Fri, 09 Oct 2015 08:02:34 -0700

Scientists have built a simulated rat brain within a supercomputer, an incredible achievement pointing to a future where machines can mimic human minds. A group of 82 researchers worked on a scheme called The Blue Brain Project, which involves ...


Mon, 05 Oct 2015 17:53:27 -0700

A new fossil has been discovered which has given scientists an insight into an ancient group of animals that flourished when dinosaurs died out. The find in New Mexico has been identified as a previously unknown species from a group of small, furry ...

Science /AAAS

Science /AAAS
Fri, 26 Jun 2015 14:33:45 -0700

Now, using computerized tomography (CT) scanning, researchers have created a 3D digital reconstruction of Hauffiopteryx's skull, making a “ghost image” of its brain known as a digital endocast (above). The team, which reported its findings online ...

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