spinal cord

Spinal cordanatomy and physiology

Dr shibinath vmPGY1 anasthesia

The CSFVolume 150 mlPressure 8-15mmHg or 100 -180mm H2O25ml in subarachnoid spaceBaricity 1.003 to 1.008 at 37* celcius

*4/5 th absorbed by sub arachnoid villi &1/5 th escapes into nerve sheath.

*Pacchionion bodies or Arachnoidgranulations.

1.cisterna magna (or cerebellomedullary cistern)

2. pontine cistern located between the pons and the medulla

3. interpeduncular cistern located between the cerebral peduncles

*Constant but slow circulation*queckenstedts test

The spinal meninges1.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

The compartments related to spinal meninges1.Sub arachnoid vircho robin space2.Subdural3 epidural or extradural space contents boundaries fibrous bands paravertebral space negative space

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

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

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

Blood supply1.Anterior spinal artery2.Posterior spinal artery4.Segmental spinal arteries3. Artery of adamkiewicz or radicularis magna

Plexus of anterior and posterior vein

Venous drainage

Cordotomy for intractable unilateralLowerlimb , trunk,pelvic, cancer pain

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The interpeduncular cistern (basal cistern or Fossa interpeduncularis) 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

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