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Related Concept Videos

Accessory Structures of the Eye01:17

Accessory Structures of the Eye

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...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
Muscles of the Eye01:20

Muscles of the Eye

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.
Extraocular Muscles
The six extraocular muscles surround the eyeball and control its movements. They are responsible for a wide range of eye motions, including looking up, down, left, right, and rotating...
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...
Tooth Anatomy01:21

Tooth Anatomy

The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.
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,...

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Related Experiment Video

Updated: May 16, 2026

Retro-orbital Injection in Adult Zebrafish
04:50

Retro-orbital Injection in Adult Zebrafish

Published on: December 7, 2009

[Needlefish jaw in the orbit].

O Rahimian1, R Hage, A Donnio

  • 1Service d'ophtalmologie, centre hospitalier universitaire de Fort de France, hôpital Pierre Zobda-Quitman, BP 632, 97261 Fort de France cedex, Martinique. rahimian1985@hotmail.com

Journal Francais D'Ophtalmologie
|December 15, 2012
PubMed
Summary
This summary is machine-generated.

A fisherman experienced eye trauma from a needlefish jaw, a rare intraorbital foreign body. Prompt surgical removal of the fish jaw led to full symptom recovery.

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Area of Science:

  • Ophthalmology
  • Trauma Surgery
  • Marine Biology

Background:

  • Penetrating orbital trauma can result from various objects, often presenting with clear entry wounds.
  • Foreign bodies in the orbit require prompt diagnosis and management to prevent vision loss and complications.

Observation:

  • A 44-year-old fisherman presented with vertical diplopia and eyelid swelling after a fish-related incident.
  • The patient had no recollection of a penetrating injury or visible entry wound.
  • A computed tomography (CT) scan revealed a foreign body lodged between the ocular globe and the medial orbital wall.

Findings:

  • Surgical exploration identified a 4.5cm needlefish jaw as the intraorbital foreign body.
  • This represents the first documented case of a needlefish jaw causing orbital injury without associated lesions, infection, or inflammation.
  • Complete resolution of the patient's symptoms was achieved following surgical extraction.

Implications:

  • Needlefish pose a significant, often underestimated, risk for penetrating ocular and orbital injuries.
  • Ophthalmologists and trauma surgeons should consider unusual foreign bodies in the differential diagnosis of orbital trauma, even in the absence of a clear entry wound.
  • Increased awareness of needlefish-related injuries is crucial for prevention and timely management in coastal communities.