brain meninges objs

Describe the general functions of cerebrospinal fluid (CSF).

-buoyancy -protection -nourishes brain -chemical signals -transports waste products

Compare and contrast the structure of the dura mater surrounding the brain and the spinal cord.

-compare: Dura mater is the outermost meninges of the brain and spinal cord, consist of a fibrous connective tissue, Both are continuous with the foramen magnum, keeps cerebrospinal fluid intact -Contrast: brain dura mater protects the brain by acting as an outer cover, brain dura mater is in line with the periosteal of the skull bone, spinal dura mater covers the spinal cord and protect it, the spinal dura mater covers the spinal cord and protects the spinal cord

identify the layers of the meninges and describe their anatomical and functional relationships to the CNS (brain and spinal cord).

-dura matter: most strong and superficial layer of meninges, contains 2 layers of fibrous CT, space between them is dural venous spinous -arachnoid matter: middle layer, weblike extensions, subdural space sep arachnoid and dura, space between arachnoid and pia is subarachnoid space which contains CSF and blood vessels -pia matter: thin vascularized ct that covers the brain tightly FUNCTION: to protect the central nervous system (CNS). This is mainly because meninges provide a tight anchoring of the CNS to the surrounding bones able to prevent side-to-side movement and providing stability.

Identify and describe the epidural space, subdural space and subarachnoid space associated with the brain and the spinal cord, and identify which space contains cerebrospinal fluid.

-epidural space: space between skull and SC and dura matter -subdural space: space between arachnoid and dura matter -subarachnoid space: space between arachnoid and pia matter, contains CSF and blood vessels

Describe the production, flow, and reabsorption of cerebrospinal fluid (CSF), from its origin in the ventricles to its eventual reabsorption into the dural venous sinuses.

1. the choroid plexus of each ventricle produces CSF 2. CSF flows through the ventricles and into the subarachnoid space via the median and lateral apetures 3. CSF flows through the subarachnoid space 4. CSF is absorbed into the dural venous sinuses via the arachnoid granulations-surrounding all parts in CNS

Identify and describe the structure and function of the cranial dural septa.

Extensions of meningeal dura mater into the cranial cavity falx cerebri, tentorium cerebelli, falx cerebelli -provide support and stabilization between different parts of the brain.

Describe the blood-brain barrier (BBB) and its significance.

It's a barrier that separates blood vessels from the brain, made up of astrocytes. allow these vessels to tightly regulate the movement of ions, molecules, and cells between the blood and the brain. -playing a critical role in controlling the influx and efflux of biological substances essential for the brain's

Describe how the cranial bones and the vertebral column protect the CNS.

The surrounding skull and vertebral column provide a strong, protective shelter against damaging blows or bumps. The meninges are three protective, connective tissue coverings that lie between the bony encasement of the skull and vertebral column and the brain and spinal cord.

Identify and describe the ventricular system components.

The ventricles of the brain are a communicating network of cavities filled with cerebrospinal fluid (CSF) and located within the brain. The ventricular system is composed of 2 lateral ventricles, the third ventricle, the cerebral aqueduct, and the fourth ventricle.

Describe the structure and location of the dural venous sinuses, and explain their role in drainage of blood from the brain.

lie between the periosteal and meningeal layers of the dura mater. They are best thought of as collecting pools of blood, which drain the central nervous system, the face, and the scalp. All the dural venous sinuses ultimately drain into the internal jugular vein. Unlike most veins of the body, the dural venous sinuses do not have valves. -deoxyginated blood