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Related Concept Videos

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,...
Neurulation01:30

Neurulation

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 anterior...
Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the posterior columns...
Cerebellum: Anatomical Regions01:17

Cerebellum: Anatomical Regions

The cerebellum, also known as the "little brain," is located in the posterior cranial fossa, inferior to the tentorium cerebelli and dorsal to the brainstem. It plays a significant role in motor control, coordination, and proprioception.
Cerebellar Structure
Externally, the cerebellum features a highly convoluted surface with numerous folia (narrow ridges) separated by shallow sulci (grooves). The cerebellum is divided into two hemispheres by a thin median structure known as the vermis. The...
Gastrulation01:56

Gastrulation

Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...
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...

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Updated: Jun 16, 2026

Microvascular Decompression: Salient Surgical Principles and Technical Nuances
10:35

Microvascular Decompression: Salient Surgical Principles and Technical Nuances

Published on: July 5, 2011

Basilar invagination.

Justin S Smith1, Christopher I Shaffrey, Mark F Abel

  • 1Department of Neurosurgery, University of Virginia, Charlottesville, Virginia 22908, USA.

Neurosurgery
|February 23, 2010
PubMed
Summary
This summary is machine-generated.

Basilar invagination, a craniovertebral junction anomaly, often requires surgery. Treatment involves decompression and stabilization, with techniques varying based on reducibility and neural compression severity.

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Area of Science:

  • Neurosurgery
  • Orthopedic Surgery
  • Developmental Biology

Background:

  • Basilar invagination is a congenital craniovertebral junction anomaly.
  • It involves abnormal odontoid prolapse into the foramen magnum.
  • Often co-occurs with other osseous and neural axis abnormalities.

Observation:

  • Patients frequently present with neurological symptoms and deficits.
  • Surgical intervention is often necessary to prevent disease progression.
  • Management strategies depend on the reducibility of the invagination.

Findings:

  • Reducible basilar invagination may be managed with posterior decompression and stabilization.
  • Ventral decompression is indicated for irreducible cases with neural compression.
  • Modern surgical techniques ensure deformity correction, stabilization, and high fusion rates.

Implications:

  • Timely surgical management is crucial for preventing neurological deterioration.
  • Surgical approaches should be tailored to the specific presentation of basilar invagination.
  • Advances in stabilization techniques improve patient outcomes and fusion success.