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Related Concept Videos

Sutures of the Skull01:22

Sutures of the Skull

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...
Overview of the Skull01:08

Overview of the Skull

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...
Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

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...
Cranial Bones: Superior and Posterior View01:14

Cranial Bones: Superior and Posterior View

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,...
Cerebrospinal Fluid01:21

Cerebrospinal Fluid

Cerebrospinal fluid (CSF) is a colorless liquid that flows around the brain and the spinal cord, playing a vital role in the protection, support, and overall function of the central nervous system (CNS). CSF production, circulation, and absorption are tightly regulated processes essential for the brain and spinal cord to function properly.
CSF Production
CSF is produced mainly in the choroid plexus, a network of capillaries and ependymal cells located within the ventricular system of the brain.
Anatomy of the Brain: Ventricles01:18

Anatomy of the Brain: Ventricles

There are hollow fluid-filled cavities known as ventricles deep inside the human brain. There are two lateral ventricles, one in each cerebral hemisphere, and each has three different projections — the anterior, inferior, and posterior horns visible from the lateral side. A thin membrane called the septum pellucidum separates the two lateral ventricles. The slender third ventricle in the diencephalon is connected to each lateral ventricle via a channel called the interventricular foramen. The...

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Is solid always best? Cranial performance in solid and fenestrated caecilian skulls.

Thomas Kleinteich1, Hillary C Maddin, Julia Herzen

  • 1Christian-Albrechts-Universität Kiel, Department of Zoology - Functional Morphology and Biomechanics, Am Botanischen Garten 1-9, 24098 Kiel, Germany. thomas.kleinteich@kleinteich.org

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This summary is machine-generated.

Caecilian skull shape differences minimally impact burrowing performance. Finite element analysis reveals head angle is more critical than skull type for effective substrate excavation.

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Area of Science:

  • Amphibian anatomy
  • Vertebrate paleontology
  • Biomechanics

Background:

  • Caecilians exhibit a fossorial lifestyle, leading to specialized skull anatomy.
  • Two primary skull types exist: stegokrotaphic (fully roofed) and zygokrotaphic (partially open temporal region).

Purpose of the Study:

  • To investigate the functional consequences of different caecilian skull morphologies.
  • To explore the evolutionary implications of skull structure in burrowing.

Main Methods:

  • Utilized 3-D imaging and digital modeling to transform skull types.
  • Employed finite element analysis (FEA) to simulate frontal loading under various head angles.

Main Results:

  • Minimal and non-significant differences in stress and bending were observed across stegokrotaphic, zygokrotaphic, and akinetic skull types.
  • Skull type did not significantly affect performance during simulated burrowing.

Conclusions:

  • The open temporal region of zygokrotaphic skulls does not impair burrowing function.
  • Head angle is a crucial factor influencing skull performance during caecilian burrowing, suggesting an optimal angle exists.