Morphometric Study of the Human Brainstem and Its Neurovascular Relations

Area of Science:

• Neurosurgery
• Neuroanatomy
• Surgical Anatomy

Background:

• The brainstem's complexity, due to dense nuclei and tracts, poses significant surgical challenges.
• Accurate anatomical knowledge is vital for navigating and operating within the brainstem.

Purpose of the Study:

• To provide a concise description of the brainstem's external configuration and internal neuroanatomy.
• To present morphometric data and neurovascular relationships for surgical planning.
• To correlate external morphometry with internal structures for surgical landmark identification.

Main Methods:

• Formalin-fixed brainstem specimens were used, adhering to topographic anatomy.
• Macroscopic measurements were performed using a Vernier caliper.
• Serial axial sections were analyzed to correlate external and internal features.

Main Results:

• Detailed descriptions and schematic illustrations of ventral and dorsal brainstem structures with mean dimensions.
• Demonstration of internal-external structural correspondence through axial sections.
• Presentation of cranial nerve origins, proximal diameters of posterior circulation arteries, and their relationships.

Conclusions:

• External brainstem morphometry, linked with internal structure positions, offers valuable surgical landmarks.
• Applicable in neurosurgery for intrinsic brainstem lesions, posterior fossa, and fourth ventricle procedures.