spinal cord anatomy and physiology

1. Spinal cord
anatomy and physiology
Dr shibinath vm
PGY1 anasthesia

2. The CSF
Volume 150 ml
Pressure 8-15mmHg or 100 -180mm H2O
25ml in subarachnoid space
Baricity 1.003 to 1.008 at 37* celcius

3. *4/5 th absorbed by sub arachnoid villi &1/5 th
escapes into nerve sheath.
*Pacchionion bodies or Arachnoidgranulations.

4. 1.cisterna magna (or cerebellomedullary cistern)
2. pontine cistern located between the pons and the medulla
3. interpeduncular cistern located between
the cerebral peduncles

5. *Constant but slow circulation
*queckenstedts test

7. The spinal meninges
1.The Dura mater
double layer
sac ends S2 (L5/S3)
attachments
2.The arachnoid mater
3.Pia mater
linea splendens
ligamentum denticulatum
posterior subarachnoid septum

8. The compartments related to spinal meninges
1.Sub arachnoid
vircho robin space
2.Subdural
3 epidural or extradural space
contents
boundaries
fibrous bands
paravertebral space
negative space

10. Epidural venous plexus
basivertebral veins
the valveless ,vertebral,venous
plexus of bateson

11. SPINAL CORD
*45CM length
*Cervical and lumbar
enlargements
*Conus medullaris
*Filum terminale
*cauda equina

14. 31 pairs of spinal nerves attached to it by
anterior and posterior roots

27. Blood supply
1.Anterior spinal artery
2.Posterior spinal artery
4.Segmental spinal arteries
3. Artery of adamkiewicz or radicularis magna

29. Plexus of anterior and posterior vein
Venous drainage

31. Cordotomy for intractable unilateral
Lowerlimb , trunk,pelvic, cancer pain

32. {
The interpeduncular cistern (basal cistern or Fossa interpeduncular
is a wide cavity where the arachnoid extends
across between the two temporal lobes.
It encloses the cerebral peduncles and
the structures contained in the interpeduncular fossa,
and contains the arterial circle of Willis

33. which produces an increase in venous blood in
the cranial cavity, with concomitant reduction in
space for the cerebrospinal fluid