brain anatomy model 3d

Create a highly detailed, solid, and watertight 3D medical anatomical model of an ISOLATED HUMAN BRAIN CORE. [POSITIVE PROMPT - EXACTLY WHAT TO DRAW]: Focus EXCLUSIVELY on the deep internal structures, fused into one single piece: 1. The Brainstem (Medulla, Pons, Midbrain): Must form a thick, solid, cylindrical, tree-trunk-like vertical base at the bottom. 2. The Limbic System: Positioned directly on top of the brainstem, forming a thick, solid C-shaped ring structure (representing the Cingulate gyrus and Hippocampus). 3. The Insula (Insular lobe): Located on the lateral left and right sides of this core, sculpted as clearly exposed, deep anatomical folds. [NEGATIVE PROMPT - WHAT TO STRICTLY AVOID]: DO NOT generate a complete brain. The entire outer cerebral cortex MUST BE COMPLETELY DELETED. ABSOLUTELY NO frontal lobe, NO parietal lobe, NO occipital lobe, and NO outer temporal lobe. It must NOT look like a classic wrinkled walnut. It must look like a deeply dissected, stripped-down neuroanatomical core expos