lecture 7 Flashcards
The brain is supplied by the two
internal carotid and the two vertebral arteries.
supply all the medial surface of the cerebral cortex as far back as parieto-occipital sulcus.
anterior cerebral artery
supply the basal nuclei of the brain and most of the area of the lateral surface
The middle cerebral artery
is the most superficial layer attaches to the inner surface of the skull bones
periosteal layer
is the dura mater proper, it is a dense, strong fibrous membrane covering the brain, and is continuous through the foramen magnum with the dura mater of the spinal cord.
meningeal layer
the meningeal layer sends inward four septa, which divide the cranial cavity into freely communicating spaces that lodge the subdivisions of the brain. function of these septa is to restrict the displacement of the brain associated with acceleration and deceleration, when the head is moved.
septa of the dura mater
is a sickle-shaped fold of dura mater that lies in the midline between the two cerebral hemispheres
Falx Cerebri:
small sickle-shaped fold of dura mater attached to the internal occipital crest, projects forward between the two-cerebellar hemispheres
Falx Cerebelli
is a small circular fold of dura mater that forms the roof for that sella turcica
Diaphragma Sella
A small opening in its center allows passage of the stalk of the
hypophysis cerebri
is a crescent-shaped fold of dura mater that roofs over the posterior cranial fossa
The Tentorium Cerebelli
are the triangular spaces between the two layers of the dura matter.
Sinuses of the Dura mater
These sinuses act as veins collecting blood from the brain and directing it to the
internal jugular veins
is a delicate, avascular, impermeable membrane covering the brain, and laying between the pia mater and the dura mater
Arachnoid Mater of the brain:
is separated from the dura mater by a potential space, the Subdural space filled by a film of fluid
arachnoid
are the knob-like projections into the venous sinuses are must numerous along the superior sagittal sinus
Arachnoid Villi or Granulations
is a vascular membrane closely invests the brain, covering the gyri and descending into the deepest sulci.
Pia mater of the brain (gentle mother):
is formed mainly in the choroid plexuses of the lateral, third and fourth ventricles
cerebrospinal fluid
forms the choroid plexus of the lateral ventricle.
The choroidal artery
supply the inferior surface of the Vermis, the central nuclei of the cerebellum and the under surface of the cerebellar hemispheres
posterior inferior cerebellar artery:
Dura mater of the brain (tough mother): it surrounds the brain, it has two layer of fibrous connective tissue.
periosteal layer
meningeal layer
Dura mater layer has
The septa of the dura mater.
The sinuses of the dura mater
occupies the line of junction of the falx cerebri with the tentorium cerebelli.
Straight sinus
Straight sinus: It is formed by the union of the
inferior sagittal sinus with the great cerebral veins.