Shell and the intershell space
Lining of the brain are a direct continuation of the spinal cord membranes.
The outer casing of the spinal cord with bony walls of the spinal canal limits the epidural space containing venous plexus, and the hard shell is called the spinal cord (dura mater spinalis). Hard shell of the brain (dura mater encephali) is cleaved to form the upper and lower sagittal sinus, transverse sinus and other venous sinuses flowing. Passing between the parts of the brain, hard shell forms processes:
- Sickle of the brain, between the hemispheres of the following;
- Falcula passing between the hemispheres of the cerebellum;
- Gallop of the cerebellum, which lies in the transverse slit of the brain;
- The diaphragm seat bounding from above the cavity that houses the pituitary gland.
Average shell, transparent, thin, contains no blood vessels, called the arachnoid brain and spinal cord (arachnoidea mater spinalis et encephali). It does not penetrate into the recesses between the different parts of the brain and spinal cord.
Soft shell (pia mater spinalis et encephali) fused with the nerve tissue, penetrating deep into the cracks and crinkles. It contains blood vessels that form in the cavities of the brain vascular plexus (plexis chorioidei), releasing cerebrospinal fluid - CSF (liquor cerebrosoinalis). For the brain cerebrospinal fluid is the so-called water-bag, performing mechanical function. In addition, it is part of the blood-brain barrier penetration in brain tissue, foreign substances, and is involved in metabolism (hormones, neurotransmitters), performing a biological function. The large cavity called the subarachnoid space tanks. Cerebellar-cerebral tank shall fence the cerebrospinal fluid.
a., aa. — arteria, arteriae (artery, the artery)
lig., ligg. — ligamentum, ligamenta (ligament, the ligaments)
m., mm. — musculus, musculi (muscle, the muscle)
n., nn. — nervus, nervi (nerve, the nerve)
r., rr. — ramus, rami (branch)
s. — seu (or)
v., vv. — vena, venae (vienna)