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Related Experiment Video

Updated: Feb 9, 2026

Assessment of Ultrastructural Neuroplasticity Parameters After In Utero Transduction of the Developing Mouse Brain and Spinal Cord

Assessment of Ultrastructural Neuroplasticity Parameters After In Utero Transduction of the Developing Mouse Brain and Spinal Cord

Published on: February 26, 2019

Ultrastructural observations on the phoronid nervous system.

Isabel Fernández¹, Fernando Pardos¹, Jesús Benito¹

¹Departamento de Biología Animal I, Facultad de Biología, Universidad Complutense, 28040 Madrid, Spain.

Journal of Morphology

|June 2, 2018

Summary

Phoronid nervous systems reveal four neuron types and abundant glial cells. This study details their nervous system structure, including giant axons and sensory cells, using transmission electron microscopy (TEM).

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Last Updated: Feb 9, 2026

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Area of Science:

Zoology
Neuroscience
Marine Biology

Background:

Phoronids are marine invertebrates with a poorly understood nervous system.
Understanding their neuroanatomy is crucial for evolutionary and functional studies.

Purpose of the Study:

To describe the cytological features of phoronid nervous systems using transmission electron microscopy (TEM).
To classify neuron types and characterize glial cells.
To investigate synaptic contacts, neuromuscular junctions, and sensory cell structures.

Main Methods:

Application of standard transmission electron microscopy (TEM) techniques.
Morphological and ultrastructural analysis of nervous system tissues from three phoronid species.

Main Results:

Distinguished four neuron types based on vesicle morphology.
Identified abundant glial cells with polymorphic dense granules, suggesting roles in nourishment, support, and neurosecretion.
Described synaptic contacts, neuromuscular junctions, trunk giant axons, and innervation of internal organs.
Detailed the structure and arrangement of tentacular sensory cells, likely mechanoreceptors.

Conclusions:

Phoronid nervous systems exhibit distinct neuronal and glial cell types.
The study provides a detailed ultrastructural basis for understanding phoronid neurobiology.
Tentative hypotheses on the function of sensory cells were proposed.