Trunk nerves (intercostal, sympathetic, vagus nerve)
Posterior fasciculus proprius
Fasciculus proprius posterior
- Origin
- Thin sleeve of short fibres immediately around the grey matter, at the back of the cord, on the inner side of the posterior column
- Insertion
- Runs up and down over a few segments and ends again in the grey matter of a neighbouring segment
- Function
- Propriospinal tract that spreads incoming sensory information across several segments, so that a stimulus at one level can trigger a reflex at several levels
- Innervation
- Intrinsic to the spinal cord
- Movement & chain
- Spreads sensory signals across neighbouring segments
- Palpation
- Not palpable
- Clinical
- It is enclosed between the posterior horns and the posterior columns, and is lost together with the surrounding gracile and cuneate fasciculi in posterior column disease such as subacute combined degeneration.
- Segmental innervation
- Along the whole length C1-Co1
- In clinical practice
- Relevant in rehabilitation after an incomplete cord injury, where recovery of intersegmental coordination is the basis of gait training
- Region in the model
- Trunk nerves (intercostal, sympathetic, vagus nerve)