Elongated and cylindrical part of the central nervous system which is contained in the upper two-third of the vertebral canal.
Integration and association of sensory modalities.
Begin as continuation of the medulla oblongata at the level of the upper border of posterior arch of Atlas above (rostral) to first pair of cervical nerve , cuts middle of dens Axis vertebrae and end as a pointed end -conus medularis at the level of L1.
Length - 45cm in male and 42 cm in female
Weight- 30 gm
Part of the spinal cord where a pair of spinal nerves is attached.
Duramater (endosteal + meningeal)
Contents of epidural space
internal vertebral venous plexus
Continuation of piamater .
starts from the lower end of spinal cord at level of L1.
Has 2 parts : Filum terminale internum-15cm and filum terminale externum-5cm
Best site for lumbar puncture :
Adult : between L3-L4
Infant: between L4-L5
Protection of spinal cord
Hydrostatic pressure of CSF
Arterial supply of spinal cord.
1. Longitudinally oriented vessels
anterior spinal artery
posterior spinal artery
2. segmental spinal arteries derived from:
deep cervical arteries
posterior intercostal arteries
Structure of spinal cord :
Inner core of the Grey matter and outer white matter
Nerve cell groups in :
Anterior grey column
Posterior grey column
Visceral affarent nucleus
Monday, June 16, 2008