Posteromarginal nucleus

Nucleus posteromarginalis

Posteromarginal nucleus of the spinal cord

The nucleus consists of a thin layer of nerve cells that "top" the back horn of the spinal cord. The core extends along the entire spinal cord of hay. and we. page.
The nucleus receives pain and temperature signals that reach the spinal cord from the skin, musculoskeletal system and intestines with the help of the back roots. The pain and temperature signals are conveyed by thin myelinated nerve fibers (A-delta filaments) and by unmyelinated nerve fibers (C-filaments).

The nerve cells of the posteromarginal nucleus, in turn, send the majority of their axons across the midline and out into the lateral strand of the opposite spinal cord. Here, the axons are distributed along three ascending pain conduction pathways:
1/ Tractus spino-thalamicus lateralis
2/ Tractus spino-reticularis
3/ Tractus spino-mesencephalicus

Within the upper part of the cervical spinal cord (segments C1 - C4), parts of the nucleus posteromarginalis are included in the nucleus of the spinal cord (nucleus spinalis nervi trigemini). This part influences the spread of pain from the face, including the mouth, nose and eye sockets, to the brain.