Anatomy Ii Week 3: Cranial Contents I

Front 1

Pia mater (2)

Back 1

-innermost meningial layer
-delicate, closely applied to brain
-dips into fissures and sulci

Front 2

epidural space (3)

Back 2

-btw dura and cranium
-contains trigeminal ganglion and its branches
-potential space only

Front 3

subdural space (3)

Back 3

-potential space
-btw dura, arachnoid
-can be site of hematoma (intracranial bleeding)

Front 4

Projections/folds of dura (4)

Back 4

-falx cerebri
-falx cerebelli
-tentorium cerebelli
-diaphragma sellae

Front 5

Sensation to dura supplied by (3)

Back 5

-CNV, X, XII

(trigeminal, vagus, hypoglossal nerves)

Front 6

Chief blood supply to dura

Back 6

-middle meningeal artery

Front 7

dural venous sinuses (3)

Back 7

-act as veins
-receive venous drainage from brain and orbits
-drains mostly into jugular vein

Front 8

origin of internal jugular vein

Back 8

-jugular foramen

Front 9

Cavernous sinus

Back 9

-closely associated with some CN's and the internal carotid

Front 10

cerebrospinal fluid:
formed by
where
circulates

Back 10

-choroid plexuses
-in ventricles
-through ventricles, enters subarachnoid space, returns to blood through arachnoid villi/granulations

Front 11

Dura Mater
layers
covers

Back 11

-outer periosteal layer: adheres to bone
-inner meningeal layer

-covers and separates portions of the brain (septa)

Front 12

Largest vertical dural septa:
name
divides, how
attachments

Back 12

-Falx Celebri
-rt/lt hemispheres, by folding in and forming double layered datum
-ant: crista gali
post: internal occipital protuberance

Front 13

Falx Cerebelli (3)

Back 13

-smaller 2-layered projection of meningeal dura
-lies on median plane of occipital bone
-runs along internal occipital crest
(kinda inf/post extention of falx cerebri)

Front 14

Tentorium Cerebelli:
location
separates
special features:
-forms
-structure

Back 14

-falx cerebri to edge of temporal bone
-divides occipital lobe/cerebellum
-not attached anteriorly
-forms tentorial incisure/notch
-brainstem passes through notch

Front 15

Horizontal dural septa (2)

Back 15

-tentorium cerebelli

-diaphragma sella

Front 16

Vertical dural septae (2)

Back 16

-falx cerebri
-falx cerebelli

Front 17

Diaphragma sella:
attachments
covers
structure(s) passing through

Back 17

-anterior clinoid process to posterior clinoid process
-hypophyseal fossa (sella turcica)
-pituitary stalk (gland remains underneath)

Front 18

How does cranial epidural space differ from that of the spinal cord?

Back 18

-no fat,
-outer layer of dura is periosteum of bone
-trigeminal ganglia located in epidural space

Front 19

epidural hematoma (3)

Back 19

-bleeding into potential space btw bone and dura
-usually from trauma to middle meningeal artery from skull fracture
-causes brain compression (can be fatal)

Front 20

Subdural hematoma (4)

Back 20

-bleeding into potential space btw dura and arachnoid
-typically caused by violent shaking, jarring
-small bridging veins torn
-small children/elderly most common

Front 21

subarachnoid space (3)

Back 21

-real space
-filled w/ blood vessels, CSF
-supports and cushions brain, nourishes outer surface

Front 22

arachnoid cisternae (2)

Back 22

-enlargements of subarachnoid space
-CSF gathers here

Front 23

primary blood supply to meninges:
name
path
branch of

Back 23

-middle meningeal a.
-lat surface of maninges, up from skull base
-maxillary a.

Front 24

Dura Mater:
Innervation

Back 24

Supratentorial: CNV

Infratentorial: CNX, C1-C3

Front 25

Superior sagittal sinus:
formed by
located
misc (1)
drains blood from
lateral projections

Back 25

-dura mater folding in on itself
-runs along sup margin of falx cerebri
-how subarachnoid CSF reenter blood stream
-sup portion of brain
-lat projections form lacunae w/ extra arachnoid villi

Front 26

arachnoid villi

Back 26

-??
-

Front 27

Inf sagittal sinus

Back 27

-drains blood from medial surfaces of cerebral hemispheres

Front 28

Straight sinus

Back 28

-blood from deep brain structures, via great cerebral vein
-shunts blood from inf sagittal sinus to sinal confluens

Front 29

Transverse sinuses (2)

Back 29

-paired
-drain fonfluens into sigmoid sinuses

Front 30

Sigmoid Sinuses

Back 30

-paired
-drains transverse sinuses, sup/inf petrosal sinuses
-empties into int jug vein