A professional, medical-grade 3D anatomical model of the human internal skull base (Basis cranii interna), presented in a horizontal cranial section. This highly detailed model is exceptionally accurate, perfectly aligning with classic anatomical atlases (such as Netter's Atlas) for studying the dural venous sinuses and cranial fossae.

Key Anatomical Features:

• Dural Venous Sinus Grooves: Meticulously preserved impressions of the transverse sinus (sulcus sinus transversi), sigmoid sinus (sulcus sinus sigmoidei), and superior sagittal sinus (sulcus sinus sagittalis superior), leading to the confluence of sinuses (confluens sinuum).
• Middle Cranial Fossa: Accurate rendering of the sella turcica, hypophyseal fossa, and the surrounding clinoid processes.
• Anterior Cranial Fossa: Detailed crista galli and cribriform plate of the ethmoid bone.
• Cranial Openings (Foramina): Watch-through openings for the foramen magnum, foramen ovale, and jugular foramen.