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The human skull is composed of several bones that come together to protect the brain and support the structures of the face. The junctions where these bones meet are called sutures.
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The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
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The superior view of the cranium shows the frontal and paired parietal bones.
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The cranium (skull) is the skeletal structure of the head that supports the face and protects the brain. It is subdivided into the facial bones and the brain case, or cranial vault. The facial bones underlie the facial structures, form the nasal cavity, enclose the eyeballs, and support the teeth of the upper and lower jaws.
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Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the...
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Evolutionary trends in the elasmobranch neurocranium.

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Area of Science:

  • Vertebrate Paleontology
  • Evolutionary Biology
  • Comparative Anatomy

Background:

  • The neurocranium (braincase) is crucial for housing the brain and sensory organs, influencing body shape and jaw articulation.
  • Elasmobranchii (sharks and rays) offer a unique model for studying braincase diversity due to their simplified cranial structure.
  • Understanding the link between elasmobranch braincase shape and ecology is vital for insights into form-function relationships.

Purpose of the Study:

  • To investigate patterns of mosaic cranial evolution in Elasmobranchii.
  • To explore the associations between elasmobranch braincase shape and ecological factors.
  • To determine the influence of jaw suspension innovation on cranial integration and modularity.

Main Methods:

  • Comparative analysis of neurocranial morphology across Elasmobranchii.
  • Phylogenetic reconstruction to infer evolutionary patterns.
  • Correlation analysis between cranial shape, ecology, water depth, and biogeography.

Main Results:

  • Elasmobranchii exhibit mosaic cranial evolution distinct from other vertebrate clades.
  • Evolutionary modularity differs between Selachii (sharks) and Batoidea (rays).
  • Jaw suspension innovations appear to drive shifts in cranial integration and modularity, facilitating ecological diversification.

Conclusions:

  • Water depth and biogeography are significant drivers of elasmobranch cranial diversity.
  • Skeletal articulation between the neurocranium and jaws acts as a major evolutionary constraint on braincase shape.
  • Cranial modularity and integration patterns in elasmobranchs are influenced by jaw suspension evolution and ecological pressures.