Brain shit Flashcards
Gyri
folds on the cortical surface
-(gyrus=singular)
Sulci
Depression on the cortical surface of the brain
-sulcus=singular
Central Sulcus
separates the frontal cortex from the parietal cortex
Lateral Fissure
Sylvian Fissure
-seperates the frontal and parietal cortices from the temporal cortex
Preoccipital notch
dividing point between the temporal and occipital cortices
Operculum
regions of the cerebrum bordering the lateral fissure
What is the CNS organized into?
Cerebral Cortex
Brainstem
Cerebellum
Spinal Cord
What makes up the cerebral cortex?
Frontal Cortex Parietal Cortex Temporal Cortex Occipital Cortex Insular Cortex Limbic System
What makes up the Brainstem?
Midbrain
Pons
Medulla
Parieto-occipital sulcus
separates the parietal cortex from he occipital cortex
Corpus Callosum
comprised of myelinated axons that interconnect the cerebral cortices of both sides
-Large myelinated fiber tracts=WHITE MATER
Thalamus
subcortical structure involved in the relay of information to and form the cerebral cortex
Medulla
inferior most portion of the brainstem
-continous with the spinal cord at the foramen magnum
Cerebellum
superior to the Doral to the brainstem
-involved with coordination
How do the two lateral ventricles communicate with he 3rd ventricle?
inter ventricular foramen
Thirdventricle
located between the thalamus and hypothalamus
-continous with cerebral aqueduct
How does CSF flow from the fourth ventricle?
Median Aperature (foramen of Magendie) Lateral Aperature (foramen of Lushka) Central Canal of Medulla and spinal cord
What do the median and lateral apertures open into?
subarachnoid space
-allows CSF to bathe the outer surface of the brain and spinal cord
Choroid Plexus
porduces CSF
-located in the later (body and inferior horn), third, and fourth ventricles
What is the pathway of flow of CSF?
- Lateral Ventricles
- Interventricular Foramen (Foramen of Monro)
- Third Ventricle
- Cebral Aqueduct
- Fourth Ventricle
- Median (foramen of Magendie/Midline) and lateral apertures (Foramen of Lushka/Bilateral)
4 TO Subarachnoid space
5.Arachnoid granulations-protrude into the superior sagittal sinus (dural sinus) - Absorbs into venous circulation
Arachnoid Granulations
Protrude into the superior sagittal Sinus (Dural Sinus)
-site of absorption of CSF into the systemic circulation
Sinus
Venous Blood
-Vascular Structures
Dura Mater
Durable/tough
- outer most part of meninges
- thickest membrane
2 Types:
- Periosteal layer of dura mater-around the bone
- Meningeal Layer of Dura mater-deep to periosteal layer
Arachnoid Membrane
deep to dura mater
-closely lines the dura mater
Subarachnoid space
contains major arteries and veins that supply the CNS
Pia Mater
vascularized Areolar membanre
- extends into every sulcus and fissure of the brain
- direct contact with the brain
3 layers of meninges
Dura Mater-outer membrane/tough and thick
Arachnoid Membrane- CSF flows int he subarachnoid space
Pia Mater-in contact with he brane
Superior Sagittal Sinus
Formed by the splitting of 2 layers of the DURA mater
Emissary Veins
pass through foramina in the cranium
-connect superficial veins with deep venous structures like the dural sinuses
Diploic veins
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