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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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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 muscles of the eye are sophisticated structures that control eye movement and focus, allowing for the precise and rapid adjustments necessary for vision. The human eye is controlled by ten muscles — six extraocular muscles, three intraocular muscles, and one primary eyelid retractor muscle.
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Sutures of the Skull01:22

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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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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
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Related Experiment Video

Updated: Mar 6, 2026

Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model
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Positional Changes of the Ocular Organs During Craniofacial Development.

Miho Osaka1, Aoi Ishikawa1, Shigehito Yamada1,2

  • 1Human Health Science, Graduate School of Medicine, Kyoto University, Kyoto, 606-8507, Japan.

Anatomical Record (Hoboken, N.J. : 2007)
|March 16, 2017
PubMed
Summary
This summary is machine-generated.

This study tracked ocular organ development in human fetuses, revealing significant medial and caudal shifts in eye position and altered relationships with the pituitary gland during craniofacial growth.

Keywords:
differential growthhuman early fetusmagnetic resonance imagingocular organsphase-contrast X-ray computed tomography

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Area of Science:

  • Developmental Biology
  • Human Embryology
  • Ophthalmology

Background:

  • Understanding craniofacial and ocular development is crucial for diagnosing congenital anomalies.
  • Previous studies have described general developmental patterns, but detailed positional changes of ocular organs remain less understood.

Purpose of the Study:

  • To describe the dynamic positional changes of ocular organs during human craniofacial development.
  • To investigate the evolving spatial relationships between ocular organs and adjacent structures, such as the pituitary gland.
  • To quantitatively analyze these changes using morphometric analyses.

Main Methods:

  • Utilized high-resolution magnetic resonance imaging (MRI) and phase-contrast X-ray computed tomography (PCCXRT).
  • Analyzed 56 human early fetal samples across various developmental stages (Carnegie stages).
  • Performed quantitative morphometric analyses to assess positional shifts and relationships.

Main Results:

  • Eyes initially located laterally shift medially and caudally within the developing craniofacial structure.
  • The proximity between the eyes and pituitary gland changes significantly during development, initially close then moving apart.
  • Positional changes were categorized into two phases: dramatic (until CS23) and stabilized (after CS23).
  • Absolute lengths increased linearly with crown-rump length, while angles and ratios showed phase-dependent changes.

Conclusions:

  • The study provides a detailed description of ocular organ positional changes during human craniofacial development.
  • These findings enhance understanding of normal ocular and craniofacial development.
  • The data may aid in identifying and understanding abnormal developmental processes affecting these regions.