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i asacr- Bieeding from the bridg-^Kartfidalty opens the subdural ■i" ii the meningeal layer of the c upper layer of the arach-Hbfcane (subdural hematoma, see ■ cełts of the uppermost layer of

the arachnoid (neurothelium) are intero nected by a dense network of tight ju tions, creating a tissue barrier (blood-ce brospinal fluid barrier).

• Subarachnoid space: This physiologic; norma! space lies just beneath the arai

pai«eins

Spinous

process

Periosteum liningthe vertebral canal

Spinał cord

Subarachnoid

space

Spinał

arachnoid

ace with Btfaicnous rtemal .enous j*exus)

Ventral (anterior) roc

Dorsal

(pos tenor) roo

Denticulate

ligament

Spinał nerve Dorsal ramus Yentral ramus

Spinał pia mater

lntervertebral

foramen

Spinał

ganglion

Communicating

branches

sć section through the spinał fc meninges

tora viewed from above. Caudal

— a¹, - _| J_rrr-

—eningeal

■Nhrs —ater sepa-■>< piiysiological

ic nrr"

lower part of the sac (not shown here). The dorsal and ventral roots unitę within a dural sleeve at the intervertebral foramina to form

fused lateral to the spinał ganglion, the spinał nerve emerges from the dural sac. The pia mater invests the surfaces of the brain and spinał

^ —TL ! • ’ !—i ^-