This clinical image shows a monoscopic, three-dimensional digital reconstruction of a postmortem human brain viewed from the inferior (ventral) aspect. The anatomical diagram highlights major neuroanatomical structures using numerical labels. The cerebrum (1) dominates the view, displaying characteristic gyri and sulci with a tan/pale-yellow coloration typical of preserved tissue; the frontal pole (2) is clearly oriented at the top. Located inferiorly and posteriorly, the cerebellum (5) is visible with its distinct, finely foliated surface. The brainstem (3) is positioned centrally, featuring the prominent, rounded protrusion of the pons (4) which serves as a major relay between the cerebrum and cerebellum. The model demonstrates the spatial relationships between the telencephalon, metencephalon, and myelencephalon. Some focal areas of darker discoloration are present on the cortical surface, likely representing postmortem vascular changes or processing artifacts. This visual is intended for neuroanatomical education, illustrating gross brain morphology and surface anatomy.

This medical anatomical diagram provides a schematic sagittal (lengthwise cross-section) view of the human brain, illustrating primary neuroanatomical structures. The cerebrum is depicted with prominent cortical folds, identifying the frontal, parietal, and temporal lobes and the cerebral cortex. Internally, the diagram highlights the components of the diencephalon and limbic system frequently affected by alcohol-related neurological disorders, including the thalamus, hypothalamus, and mammillary bodies. Key midline structures shown include the C-shaped corpus callosum, the lateral ventricle, and the pituitary gland. The posterior fossa contains the cerebellum, characterized by its distinct folia (fine surface ridges), positioned behind the brainstem. The brainstem is shown extending inferiorly toward the spinal cord. This illustration is designed for educational use in explaining neurological anatomy and the regional susceptibility of brain structures to toxic substances or metabolic changes, such as those occurring in chronic alcoholism.

Anatomical Diagram: A mid-sagittal illustration of the human brain, highlighting regions vulnerable to thiamine deficiency and Wernicke-Korsakoff Syndrome. The diagram depicts the frontal lobe with its characteristic gyri and sulci occupying the anterior and superior portions of the cerebrum. Key labeled structures in the central and posterior regions include the thalamus and hypothalamus, located superior to the small, rounded mamillary body. The brain stem is shown extending inferiorly, connecting to the spinal cord. Posterior to the brain stem is the cerebellum, illustrating its distinctive arbor vitae branching pattern. The lateral ventricle is represented as a blue, C-shaped structure above the thalamus. This illustration serves an educational purpose in neurology and nutrition, demonstrating the spatial relationships and functional anatomy of subcortical and brainstem structures often involved in metabolic encephalopathies.

An anatomical diagram illustrating the arterial supply of the brain from an inferior (basal) perspective, specifically highlighting the Circle of Willis and its contributing vessels. The diagram shows the bilateral internal carotid arteries branching into the middle cerebral (MCA) and ophthalmic arteries. Centrally, the anterior cerebral arteries (ACA) are seen originating and coursing medially into the longitudinal fissure, connected by the anterior communicating artery (ACoA). The posterior circulation is depicted with the vertebral arteries merging into the basilar artery, which subsequently divides into the posterior cerebral arteries (PCA). Posterior communicating arteries (PCoA) are shown forming the critical anastomotic link between the internal carotid and posterior cerebral systems. The diagram is superimposed on the ventral surface of the brain, demonstrating the spatial relationship of these vessels to the frontal, temporal, and occipital lobes, as well as the cerebellum and brainstem. This illustration is an educational resource for understanding neurovascular anatomy and the territories susceptible to ischemic stroke.

This medical visual content consists of an anatomical diagram (a) and a corresponding clinical photograph of a cadaveric dissection (b) illustrating neurovascular anatomy. The focus is on the Circle of Willis, specifically demonstrating a congenital vascular variation known as aplasia of the A1 segment of the anterior cerebral artery (ACA). In both panels, a yellow dotted circle highlights the area where the right A1 segment should connect the internal carotid artery to the anterior communicating artery (ACoA). The absence of this segment results in an incomplete Circle of Willis, which has clinical significance for collateral cerebral blood flow. The diagram (a) clearly depicts the major components of the cerebral arterial circle, including the basilar artery, posterior cerebral arteries, internal carotid arteries, and the intact left A1 and A2 segments. The clinical photograph (b) provides a real-world view of the same anatomical deficiency at the base of the brain. This material is designed for advanced medical education in neuroanatomy and radiology, emphasizing common vascular anomalies.

This educational image consists of a side-by-side comparison illustrating a vascular anatomical variation within the Circle of Willis. On the left is a medical illustration (Pathophysiology Diagram) of the cerebral arterial system, and on the right is a corresponding clinical photograph of a cadaveric specimen dissection. The focus is on aplasia of the P1 segment of the posterior cerebral artery (PCA). In both images, the basilar artery and the bifurcation into the superior cerebellar arteries are visible. However, there is a distinct discontinuity where the P1 segment should connect the basilar artery to the P2 segment of the PCA. A yellow dotted line is used as an annotation to indicate the expected anatomical trajectory of the missing P1 segment. This variation signifies a 'fetal-type' posterior circulation, where the distal PCA (P2 segment and beyond) receives its primary blood supply from the internal carotid artery via the posterior communicating artery rather than from the basilar artery. Such morphological variations are clinically significant in neurosurgery and the management of ischemic stroke or aneurysms.