Why is optic nerve injured after 3 months?

summary

Nerve injury itself is not easy to treat, let alone the optic nerve? Traumatic optic nerve injury is an inflammatory lesion of optic nerve caused by trauma. It is one of the common and serious complications in craniocerebral injury, accounting for about 2% - 5% of craniocerebral injury. Now I'd like to share with you about why the optic nerve injury happened three months later? Experience in this area.

Why is optic nerve injured after 3 months?

First, according to the cause of injury, it can be divided into traffic accident injury, falling injury and strike injury, among which the most common one is traffic accident injury. Due to the anatomical structure and physiological characteristics, more than 90% of optic nerve injuries are indirect injuries of optic nerve segments. The direct injury of optic nerve caused by sharp instrument and other parts of optic nerve are rare in clinic.

Second: indirect optic nerve injury refers to the lateral orbit, generally refers to the upper temporal eyebrow arch by impact, external force transmitted to the optic canal through the skull, causing optic canal deformation or fracture, resulting in optic nerve injury caused by vision, visual field disorders.

Third, the optic nerve is composed of the axons of retinal ganglion cells converging at the optic disc and then passing through the sclera. The optic nerve passes through the optic canal into the cranial fossa, connects to the optic chiasm, and then connects to the diencephalon through the optic canal. Because the optic nerve is a part of the process of the brain protruding outward to form the optic organ during embryogenesis, the optic nerve is surrounded by three layers of meninges, and the subarachnoid space extends to the optic nerve.

matters needing attention

1. The inner segment of optic nerve was damaged by the wall of optic nerve tube; 2. Deformation and fracture of anterior clinoid process and compression of optic nerve by fracture piece; 3. When the optic nerve moves upward to the sharp edge of dural fold, the optic nerve will be injured; 4. The foreign body penetrates directly into the orbit and brain to damage the optic nerve and its tunica vaginalis; 5. Optic nerve ischemic edema caused by rupture of blood supply vessels;