The Rexed laminae are organized from dorsal (posterior) to ventral (anterior) in the spinal cord. Here is a brief overview of each lamina:
1. Lamina I: Also known as the marginal zone, it contains neurons that respond to noxious and thermal stimuli. 2. Lamina II: Known as the substantia gelatinosa, it is rich in interneurons and plays a crucial role in processing pain and temperature sensations. 3. Laminae III and IV: These laminae form the nucleus proprius and are involved in receiving input from the skin and proprioceptors. 4. Lamina V: Located at the base of the dorsal horn, it integrates sensory information from different sources. 5. Lamina VI: Found only in the cervical and lumbar enlargements, it processes proprioceptive information. 6. Lamina VII: Known as the intermediate zone, it includes the dorsal nucleus of Clarke and the intermediolateral cell column, which are involved in autonomic functions. 7. Lamina VIII: Located in the medial aspect of the ventral horn, it contains motor interneurons. 8. Lamina IX: Comprising the motor neuron pools, it directly innervates skeletal muscles. 9. Lamina X: Surrounding the central canal, it contains neurons involved in visceral pain and autonomic functions.
