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Related Concept Videos

Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

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The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
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Cranial Bones: Superior and Posterior View01:14

Cranial Bones: Superior and Posterior View

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The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
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Overview of the Skull01:08

Overview of the Skull

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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.
The cranial vault surrounds and protects the brain and houses the middle and inner ear structures. This cavity is bounded superiorly by the rounded top of the skull, which...
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Sutures of the Skull01:22

Sutures of the Skull

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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.
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...
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Cranial Nerves: Overview and Anatomy01:19

Cranial Nerves: Overview and Anatomy

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The cranial nerves are an important part of the complex network of nerves in the human body. These nerves emerge directly from the brain and are responsible for transmitting essential information between the brain and various parts of the head and neck. There are 12 pairs of cranial nerves, systematically numbered using Roman numerals from I to XII, beginning from the anterior and moving to the posterior of the brain. Each cranial nerve is uniquely identified by names that reflect its function...
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Convergent Evolution01:54

Convergent Evolution

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Updated: Jan 18, 2026

Assessing Species-specific Contributions To Craniofacial Development Using Quail-duck Chimeras
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Avian cranial evolution is influenced by shape interactions between hard and soft tissue traits.

Andrew Knapp1,2, Taylor West3, Catherine M Early4

  • 1Department of Cell and Developmental Biology, University College London, LondonWC1E 6BT, UK.

Proceedings. Biological Sciences
|January 15, 2026
PubMed
Summary

Bird brain evolution involves integrated cranial changes, not isolated events. These complex interactions between hard and soft tissues drive avian diversity.

Keywords:
adaptive evolutionbirdsevolutionary trade-offsgeometric morphometricsphenotypic evolution

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Area of Science:

  • Evolutionary biology
  • Comparative anatomy
  • Paleontology

Background:

  • Avian brain evolution is linked to neurosensory and cognitive diversity.
  • Cranial changes, including beak evolution and jaw muscle restructuring, accompany brain evolution.
  • Developmental trade-offs are proposed but their evolutionary impact on cranial traits is unclear.

Purpose of the Study:

  • To explore the phenotypic evolution of avian cranial hard and soft tissues.
  • To test hypotheses of correlated trait evolution in the avian head.
  • To understand how developmental patterns translate into evolutionary correlations.

Main Methods:

  • Utilized two-block partial least squares analyses.
  • Employed Ornstein-Uhlenbeck models for adaptive trait evolution.
  • Investigated pairwise trait correlations and reciprocal interactions via the neurocranium.

Main Results:

  • All analyzed cranial traits were found to be significantly correlated.
  • Evidence supports adaptive trait evolution across the entire avian head.
  • Traits exhibit reciprocal interactions mediated by the neurocranium.

Conclusions:

  • The avian head demonstrates a highly integrated structure.
  • Diverse avian phenotypes arise from complex interactions among hard and soft cranial tissues.
  • Understanding these integrated evolutionary processes is key to avian diversity.