A novel protocol for generating intact, whole-head spider cephalothorax tissue sections

Area of Science:

• Neuroscience
• Zoology
• Histology

Background:

• Spider behavior and sensory systems offer insights into brain-behavior relationships.
• Spider cephalothorax morphology presents histological challenges due to heterogeneous tissues and sclerotized regions.
• High internal pressure in spider cephalothoraxes can disrupt tissue during processing.

Purpose of the Study:

• To develop a novel protocol for producing thick whole-head sections of spider cephalothoraxes for morphological study.
• To present an effective whole-head DiI staining method for highlighting neural structures.

Main Methods:

• A new protocol was developed to soften the spider exoskeleton and stabilize friable tissues.
• The method avoids freezing and dehydration, preserving tissue integrity.
• A whole-head DiI staining technique was optimized using minimal dehydration.

Main Results:

• The protocol successfully produced thick, whole-head sections of spider cephalothoraxes.
• The method stabilized tissues, preventing shifts and maintaining cohesion.
• DiI staining effectively highlighted neural structures in the processed tissue.

Conclusions:

• This novel histological protocol overcomes challenges in spider cephalothorax preparation.
• The technique facilitates detailed morphological studies of spider neuroanatomy and brain-behavior links.
• The DiI staining method enhances visualization of neural pathways in whole-head sections.