This anatomical diagram provides a lateral view of the human brain, specifically illustrating the visual pathway and the spatial distribution of the optic radiation. Based on Harvey Cushing's 1921 drawing, the illustration highlights the geniculocalcarine tract from its origin at the lateral geniculate body (LGB) to its termination in the primary visual cortex (calcarine area). A key educational focus is the 'temporal detour' or Meyer’s loop, where the ventral fibers of the optic radiation arc anteriorly around the temporal horn of the lateral ventricle before heading posteriorly toward the occipital lobe. Other labeled anatomical landmarks include the optic nerve, optic chiasm, optic tract, and the main body of the lateral ventricle. This diagram is significant for understanding neuroanatomy related to visual field deficits (e.g., quadrantanopia) that may arise from lesions or neurosurgical procedures in the temporal lobe, such as epilepsy surgery or tumor resection.

Anatomical diagram and educational infographic detailing the human visual pathway and associated visual field defects. The central illustration shows a superior (dorsal) view of the brain, highlighting the optic nerve, optic chiasm (decussation point), optic tract, lateral geniculate body, optic radiations, and the primary visual cortex in the occipital lobes. Pathways are color-coded (red and blue) to demonstrate the transition from nasal and temporal retinal fibers to the contralateral and ipsilateral hemispheres. Black lesion bars indicate specific sites of damage along this pathway. Flanking the central diagram are clinical representations of visual field loss patterns. The 'Right' panel displays bilateral defects including bitemporal hemianopia, incongruous homonymous hemianopia, and congruous homonymous hemianopia. The 'Left' panel displays unilateral or localized defects including central scotoma, centrocaecal scotoma, arcuate scotoma, and temporal wedge. This diagram serves as a neuro-ophthalmological guide for localizing lesions within the central nervous system based on perimetry findings.

This composite diagnostic and pathophysiology diagram illustrates the anatomical structures and neuroplastic changes of the human visual pathway, specifically focusing on atrophy in congenitally blind individuals. The primary image is a transversal T1-weighted MRI slice with a superimposed schematic of the visual system. Key structures are labeled: the optic nerves originating from the globes, the optic chiasm, the lateral geniculate nucleus (LGN) and pulvinar of the thalamus, the optic radiations (geniculocalcarine tract), and the primary visual cortex in the occipital lobe. Three smaller axial brain scans on the left provide additional context. The top scan is a structural MRI identifying the optic nerve and chiasm. The middle and bottom scans are color-coded statistical parametric maps (likely VBM or PET) showing regional brain volume differences. Blue shading indicates areas of significant gray matter volume reduction (atrophy) in the thalamic relays and visual cortex, while red/yellow highlights show areas of metabolic or structural divergence. This visual is designed for advanced medical education regarding neuroanatomy and the effects of long-term sensory deprivation on the central nervous system.

An anatomical diagram illustrating the human visual pathway and its surrounding cranial structures. The schematic highlights the progression from the anterior globes (eyeballs) to the posterior visual cortex. Key structures labeled include the optic nerves (b) extending from the eyeballs, passing through the bony optic canals (c) to converge at the central optic chiasm (g). The diagram demonstrates the decussation of fibers continuing as optic tracts (d) toward the lateral geniculate nuclei (j). The final segment depicts the optic radiation (k), including Meyer’s loop (i), projecting to the primary visual cortex. Surrounding clinical anatomy is integrated, showing the extraocular muscles and tendons (a), orbital blood vessels (f), and the ophthalmic artery (h) in close proximity to the neural structures. This visual summarizes the neuroanatomical relationships essential for understanding visual field defects and imaging diagnostics like CT and MRI tractography.

Educational anatomical diagrams illustrating the human visual system pathways across two planes. (A) Sagittal view showing the spatial arrangement of the eye sensing organ, the intracranial optic nerve pathway, and its termination at the primary visual cortex (highlighted in red) in the occipital lobe. (B) Transverse rendering providing a superior view of the visual pathway components overlaid on a brain model. Labeled structures include the eyes, optic discs, optic nerves, the X-shaped optic chiasm, optic tracts, and optic radiations (geniculocalcarine tracts). The diagram uses color-coding (red and blue) to demonstrate the partial decussation of nerve fibers at the optic chiasm, where information from each eye is distributed to both cerebral hemispheres, ultimately reaching the bilateral primary visual cortex. This visual aid is designed for teaching neuroanatomy and the physiological basis of binocular and stereoscopic vision.

This diagnostic image features an axial T1-weighted Magnetic Resonance Imaging (MRI) scan of the human brain, integrated with blue Diffusion Tensor Imaging (DTI) fiber tractography to visualize the visual pathway. The illustration maps the neuroanatomical trajectory from the orbits to the occipital lobe. Key structures are labeled: the optic nerve (extending from the posterior eye), the optic chiasm (central decussation), the optic tract (posterior to the chiasm), and the optic radiation (projecting to the visual cortex). Additionally, the image serves as a clinical localization map for six case reports, identifying specific sites of dysfunction: Case 1 (eye), Case 2 (optic nerve), Cases 3 and 4 (optic chiasm), and Cases 5 and 6 (visual cortex). This combination of structural MRI and DTI tractography demonstrates the spatial relationship between clinical pathology and white matter pathways, supporting advanced neuro-ophthalmological education and radiological diagnosis.