Radiological anatomy of the cerebral cortex... made easy.

Cerebral Anatomy and Lobar Functions
📌 The brain's convoluted surface, characterized by gyri (bumps) and sulci (grooves), maximizes the cerebral cortex surface area, with about 70% hidden within the sulci.
🧠 The brain is broadly divided into four lobes using the central sulcus and Sylvian fissure as key landmarks: Frontal (motor functions, personality), Parietal (sensory processing), Temporal (hearing, memory, smell), and Occipital (vision).
👃 The Insula (sometimes considered a fifth lobe) is hidden deep in the Sylvian fissure and is likely involved in processing pain and integrating sensory information with emotions.
🧠 The Limbic Lobe (a potential sixth lobe along the midline, including parts of the frontal and parietal lobes) is crucial for emotions and memory.

Key Gyri and Sulci on the Lateral Surface
📍 The Central Sulcus separates the pre-central gyrus (containing the primary motor cortex) anteriorly from the post-central gyrus (containing the primary somatosensory cortex) posteriorly.
🗺️ The Inferior Frontal Gyrus is situated along the anterior and ascending branches of the Sylvian fissure and often takes an "M" shape on sagittal images; this region contains the anatomical Broca area (motor speech center).
🧩 The Inferior Parietal Lobule is composed of the Supramarginal Gyrus and the Angular Gyrus, sitting atop the posterior branches of the Sylvian fissure and the superior temporal sulcus, respectively.

Key Structures on the Medial Surface and Imaging Correlation
🖼️ On medial (sagittal) MRI views, key landmarks include the Cingulate Sulcus, which runs parallel to the Corpus Callosum, and the Parietal Occipital Sulcus intersecting with the Calcarine Sulcus.
👁️ The Primary Visual Cortex is located in the cortex of both the Lingula and Cuneus along the Calcarine Sulcus. In the coronal plane, the intersection of the Parietal Occipital Sulcus and Calcarine Sulcus forms an easily recognizable "X" shape.
🦵 The Paracentral Lobule on the medial surface integrates the motor representations of the contralateral leg (anteriorly/pre-central) and sensory representations (posteriorly/post-central).

Tips for Radiological Identification on Axial/Sagittal Images
🔍 To locate the Central Sulcus on axial images, look for the intersection of the Superior Frontal Sulcus and the Pre-central Sulcus, which often resembles an "L" or "T" shape.
✋ The Hand Knob (motor representation for the hand/arm) is often visible as an inverted Omega or Epsilon shape on the Pre-central Gyrus, which can confirm its location once the central sulcus is identified.
👂 The Primary Auditory Cortex is located in Heschl's Gyrus, a small gyrus visible as a "mushroom" or "A-bomb cloud" shape on coronal or sagittal images, situated on the superior surface of the Superior Temporal Gyrus.

Key Points & Insights
➡️ Prioritize anatomical knowledge over rote memorization of structures on images, as knowing key landmarks allows you to deduce surrounding anatomy.
➡️ To find the Central Sulcus on axial images, look for the "L" or "T" sign formed by the superior frontal and pre-central sulci, and then verify using the hand knob landmark.
➡️ For finding primary language centers, look for the "M" shape of the Inferior Frontal Gyrus on sagittal images, as the Broca area is located in its Triangular and Opercular parts.
➡️ Practice localization on every brain CT/MRI scan; this consistent application of anatomical knowledge is the most effective way to master structure identification.

📸 Video summarized with SummaryTube.com on Feb 08, 2026, 05:59 UTC