🧠 Brain

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==== 🧠 Brain – Major Sulci and Gyri ====
  * 🧩 **Central sulcus** – Separates frontal and parietal lobes.
  * 🌀 **Lateral sulcus (Sylvian fissure)** – Divides temporal from other lobes.
  * 🧠 **Precentral gyrus** – Primary motor cortex.
  * 🧠 **Postcentral gyrus** – Primary sensory cortex.
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==== 🧠 Brain – Deep Structures ====
  * 🔗 **Corpus callosum** – Connects both hemispheres.
  * 🎯 **Thalamus** – Relay of sensory/motor input.
  * ⚙️ **Brainstem** – Vital autonomic control.
  * 🍒 **Cerebellar tonsils** – Chiari malformation relevance.
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==== 🧠 Brain – Ventricular System & Craniometrics ====
  * 🔄 **Foramen of Monro** – Lateral to 3rd ventricle.
  * 🧬 **Aqueduct of Sylvius** – 3rd to 4th ventricle.
  * 📍 **Bregma** – Craniometric surgical landmark.
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==== 🦴 Spine – Surface & Vertebral Landmarks ====
  * 📌 **T4** – Nipple line.
  * 📌 **T10** – Umbilicus level.
  * 📏 **L4** – Level of iliac crest (lumbar puncture).
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==== 🦴 Spine – Internal Neural Structures ====
  * ⚡ **Conus medullaris** – Cord ends (L1–L2).
  * 🧵 **Cauda equina** – Nerve root bundle.
  * 🛡️ **Dural sac** – Ends at S2.
  * 🪢 **Filum terminale** – Cord anchoring.
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==== 🦴 Spine – Key Vertebrae & Foramina ====
  * 🌀 **C2 (Axis)** – Dens for rotation.
  * 💉 **L4–L5** – Common for lumbar puncture.
  * 🔌 **Intervertebral foramen** – Nerve exits.
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