Renshaw cell

Renshaw cells are a type of interneuron found in the spinal cord of mammals. They are named after Birdsey Renshaw, who first described them in the 1940s. Renshaw cells play a crucial role in the motor system by providing inhibitory feedback to motor neurons.

Anatomy and Location

Renshaw cells are located in the ventral horn of the spinal cord, specifically in the lamina VII region. They receive input from alpha motor neurons via collateral branches of the motor axons. This anatomical arrangement allows Renshaw cells to modulate the activity of the motor neurons that innervate skeletal muscles.

Function

The primary function of Renshaw cells is to provide recurrent inhibition to motor neurons. When a motor neuron fires, it sends a collateral signal to a Renshaw cell, which in turn inhibits the same motor neuron and its neighboring motor neurons. This feedback loop helps to regulate motor neuron activity, preventing excessive firing and ensuring smooth and coordinated muscle contractions.

Neurotransmitters

Renshaw cells release the inhibitory neurotransmitter glycine, which binds to receptors on motor neurons to produce an inhibitory effect. In some cases, they may also release gamma-aminobutyric acid (GABA), another inhibitory neurotransmitter.

Clinical Significance

Dysfunction of Renshaw cells has been implicated in various neurological disorders, including amyotrophic lateral sclerosis (ALS) and spinal cord injuries. Understanding the role of Renshaw cells in these conditions could lead to new therapeutic approaches.

Related Pages

• Interneuron
• Spinal cord
• Motor neuron
• Glycine
• Gamma-aminobutyric acid
• Amyotrophic lateral sclerosis