X hits on this document

60 views

0 shares

0 downloads

0 comments

5 / 26

@ zygomatic arch and @ superior nuchal line, loose areolar layer closely adherent to bone: infections cannot spread beyond

o

Pericranium/periosteum

Covers cranial vault

Metopic suture: from nasion upwards

Interior of skull

Three parts

o

Compact outer lamina

o

Compact and very hard inner lamina

o

Diploe: layer of spongy bone and sandwiched b/w outer and inner laminae

Contains diploic veins

No diploe in temporal region; covered with thick and fleshy temporalis muscle

Bone marrow

Occipital wedge

o

Cerebellar fossae

o

Grooves for transverse sinuses

Meninges of brain

o

Membranes covering brain

o

Dura mater (pachymeninx)

Outer tough membrane

Two layers

Rough, outer layer: adherent to cranial bones where it forms an endocranium

Smooth inner layer

Layers are indistinguishable except where they separate to enclose venous sinuses

Supplied by middle meningeal artery

Bulk of blood reaches adjacent cranial bones

Epidural hematoma: artery is torn

o

Blood accumulates b/w bony skull and dura mater

Anterior branch crosses area of pterion

o

Arachnoid (part of leptomeninx)

Intermediate membrane w/ spiderweb processes

Thin, nonvascular membrane; covers all gaps and fissures of brain surface

Subarachnoid space

Contains CSFeffective shock absorber

Substantial intervals b/w pia and arachnoid: cisternae

Largest: cisterna cerebellomedullaris (cisterna magna)

o

Enlargened subarachnoid space b/w caudal part of cerebellar hemispheres and medulla oblongata

Arachnoid granulations: projections of subarachnoid space filled with CSF

Removes excess CSF

Empty into venous sinuses by diffusion

Make small shallow depressions (foveolae granulares) on inner aspect of skull

Subdural hematoma: bleeding b/w dura mater and araachnoid

Potential space limited by falx cerebri and tentorium cerebelli

Subdural hemorrhage can spread thinly and widely over a hemisphere

o

Pia mater (part of leptomeninx)

Soft, delicate membrane

Closely applied to brain

Caries all blood vessels that supply brain

o

Meninges of brain continuous with those covering spinal cord

Sinuses

Superior sagittal sinus

Document info
Document views60
Page views60
Page last viewedWed Dec 07 18:47:50 UTC 2016
Pages26
Paragraphs2571
Words8835

Comments