Summary of "Спинномозговой узел"

Structure and Function of the Spinal Ganglion

The video explains the anatomical and cellular components of the spinal ganglion, also known as the spinal nerve node or final ganglion.

A nerve node is a cluster of neuron bodies located outside the central nervous system.

Anterior (ventral) roots: Carry motor information away from the spinal cord.
Posterior (dorsal) roots: Carry sensory information into the spinal cord.

The anterior and posterior roots join at a bifurcation, forming a mixed spinal nerve that contains both sensory and motor fibers.

The spinal ganglion appears as a thickening on the posterior root near the bifurcation.

Sensory Neuron Bodies The ganglion contains pseudounipolar sensory neuron bodies characterized by:
- Large, rounded cell bodies
- Centrally located euchromatic nuclei
Satellite Cells (Mantle Gliocytes) These cells surround the neuron bodies and belong to the dendroglial family. They have small, light, round nuclei visible around the neurons.
Basement Membrane Neurons and satellite cells are enclosed by a basement membrane, which is not visible in the preparation.
Connective Tissue Capsule Outside the basement membrane lies a connective tissue capsule composed of fibroblast cells with elongated, dark nuclei.
Stroma The connective tissue capsule extends layers of loose connective tissue deep into the ganglion, forming the stroma that contains blood vessels.