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a scientist who studies the cellular structure of neurons (nerve cells) in brain tissue samples is most concerned with which scientific discipline?
gross anatomy
microanatomy
biology
physiology

Explanation:

• Gross anatomy: Focuses on large - scale structures visible to the naked eye. Studying cellular structure is not within its scope.
• Microanatomy: Deals with structures at the microscopic level, such as cells. Neurons' cellular structure in brain tissue samples falls under this.
• Biology: A broad field. While microanatomy is a part of biology, the more specific sub - field here is microanatomy.
• Physiology: Concerned with the function of living organisms and their parts, not the structure at the cellular level in this context.

Answer:

Microanatomy