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Spinal Cord Grey Matter in Rat (20x)

Image 4 of 5 in Series "Nervous Tissue"

Description

This section shows grey matter in the ventral horn of the spinal cord. The yellow arrow indicates the soma of a motor neuron. Within the cell body, there is a distinguishable nucleus (orange arrow) with a prominent nucleolus (red arrow). The stippling seen in the cytoplasm (black arrow) is called “Nissl substance,” which are ribosomes that stained blue due to the presence of nucleic acids. Different glial cells found within the connective tissue are depicted as well (microglia – blue; astrocyte – teal; oligodendrocyte – green).

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This image is part of the series "Nervous Tissue"

Other images in this series

Myelinated Axon in Rat PNS (40x)

by: Caleb Bacak, BS, BA; Sheba MohanKumar, BVSc, MS, PhD

This slide shows axon tracts. The yellow arrow indicates a Schwann cell nucleus. Schwann cells wrap around a single axon many times over to form a myelin sheath. When processing the tissue, lipids within the myelin sheath are washed off, leaving behind neurokeratin. Between two Schwann cells on a myelinated axon there is a Node of Ranvier, which is shown by the red arrows.

Unmyelinated Axons in a Section of a Rat Larynx (40x)

by: Caleb Bacak, BS, BA; Sheba MohanKumar, BVSc, MS, PhD

The blue arrows point to two unmyelinated axon bundles. These are distinguishable from myelinated axons by appearing wavy, and there is no neurokeratin (myelin sheath) surrounding the axon.

Spinal Cord in the Rat (2.5x)

by: Caleb Bacak, BS, BA; Sheba MohanKumar, BVSc, MS, PhD

This section of the spinal cord highlights the distinction between the white and grey matter. The grey matter of the spinal cord (shown by the yellow arrow) is darker than the white matter (shown by the red arrow) due to the abundance of neuronal cell bodies. The white matter is primarily composed of axons. Also shown in this slide are the ventral spinal artery (green arrow), central canal (black arrow), and the dorsal (blue arrow) and ventral (orange arrow) horns of the spinal cord. Interneurons reside within the dorsal horn, whereas motor neurons reside in the ventral horn. Sensory neurons are in the dorsal root ganglion that are located outside the spinal cord.

Rat Brain Nuclei (2.5x)

by: Caleb Bacak, BS, BA; Sheba MohanKumar, BVSc, MS, PhD

This image shows two nuclei, which are clusters of neuronal cell bodies in the central nervous system. Each nucleus has a collection of neurons with associated phenotypes. Nuclei are usually bilaterally located and have matching neuronal populations.