neuroanatomy I and II Flashcards
layers of the scalp
Skin
Connective tissue
Apoenurosis
Loose connective tissue
Periosteum
what is the proper scalp
skin
connective tissue
aponeurosis
(are connected and move together)
aponeurosis
helps prevent stretching of the scalp
deep scalp
loose connective tissue
periosteum
what is within the loose CT
emissary vein and others
what could travel through the emissary vein
potential infection into the cranial vault
what are meninges
3 layers of tissue to provide protection and support to the CNS (brain and spinal cord)
superfifcal to deep of the meninges
- dura mater
- arachnoid mater
- pia mater
dura mater
- think layer of meninges deep to the calvarium (skull cap)
- encloses dural venous sinuses (major structures that drain the cranial vault)
- at the edge of the skull, at the foramen magnum
- continues around the edge of skull and around the spinal cord
what does the dura mater form
three invagination (folds) with the cranial vault
- falx cerebri
- tentorium cerebelli
- falx cerebelli
where does falx cerebri attach
anteriorly to the crista Galli of the ethmoid bone
layers within the dura mater
2
periosteal layer (superifical) (around the edge of the skull)
meningeal layer (deeper) (around the spinal cord)
- these layers split to help form the dural venous sinuses
spaces within the dura mater
2
- epidural space
- subdural space
why are the spaces within the dura mater potential space?
they are not found unless trauma/disease cause seperation of these layers
arachnoid mater
sits deep to the dura, on the dura
subarachnoid space
between arachnoid and pia, contains cerebrospinal fluid (CSF)
cerebrospinal fluid
- CSF helps metabolically and physically support the brain
- metabollicaly: exchange medium
- physically: buoyancy and cushion
arachnoid granulations
drain CSF through the dura
arachnoid trabeculae
support the arachnoid mater
pia mater
closely covers cortical sulci and gyri
- subpial space exists between pia and cortex (another potential space)
spinal meninges
3 layers of tissue to provide protection and support to the spina cord:
- dura mater
- arachnoid mater
- pia mater
spinal meninges: dura and arachnoid
cover the spinal nerve roots
spinal meninges: pia and dura
denticulate ligaments (from pia) connect to dura for cord stability
spinal meinings: epidural space
contains fat and venous plexuses