BIOD152 TEST BANK UPDATED QUESTIONS
AND ANSWERS FULL STUDY SHEET
●● why are the protective structures of the brain important ?
Answer: neurons are not replaceable and nervous tissue is damaged by
even the slightest pressure
●● what protects the brain?
Answer: the skull, the meninges, a cushion of cerebrospinal fluid and the
blood brain barrier
●● how many ventricles are inside the brain ?
Answer: four ventricles
●● describe the function of the brain ventricles
Answer: cavities within the brain that are filled with cerebrospinal fluid
(CSF)
there are four ventricles in the interior of the brain, they are chambers
filled with CSF which is produced there. Once formed the CSF
circulates through the ventricles and into the subarachnoid space of the
brain.
,●● where does the fourth ventricle drain into?
Answer: the central canal of the spinal cord which also contains CSF
●● what are the meninges?
Answer: three layers of connective tissue membranes that cover and
protect CNS organs and enclose CSF
●● what are the layers of the meninges?
Answer: the outer layer: dura mater
the middle: arachnoid meninx (separated from dura mater by subdural
space) (beneath this is the subarachnoid space which contains blood
vessels and is filled with CSF)
the inner: Pia mater (thin connective tissue tightly attached to the brain)
●● this is the most superficial layer of the brain meninges?
Answer: dura mater (menix)
●● what is cerebrospinal fluid CSF?
Answer: a special fluid formed in the walls of the ventricles from blood
plasma by permeating through the choroid plexus
, ●● what is the choroid plexus formed by
Answer: formed from a network of blood vessels within the ventricles
CSF circulates through the ventricles and into the meninges.
●● what is the blood brain barrier
Answer: a diffusion barrier that prevents most particles from entering
the CNS tissue keeping the brain and spinal cord separate from general
blood circulation
●● what forms the blood brain barrier and what protects it
Answer: formed by the relatively impermeable brain capillaries.
glial cells astrocytes wrap tightly around capillaries to prevent harmful
substances from harming neurons
●● What is the largest portion of the brain?
Answer: cerebrum
comprising about 83% of total brain mass
●● what separates the left and right cerebral hemispheres
Answer: the median longitudinal fissure
●● what are gyri?
Answer: raised ridges of tissue
AND ANSWERS FULL STUDY SHEET
●● why are the protective structures of the brain important ?
Answer: neurons are not replaceable and nervous tissue is damaged by
even the slightest pressure
●● what protects the brain?
Answer: the skull, the meninges, a cushion of cerebrospinal fluid and the
blood brain barrier
●● how many ventricles are inside the brain ?
Answer: four ventricles
●● describe the function of the brain ventricles
Answer: cavities within the brain that are filled with cerebrospinal fluid
(CSF)
there are four ventricles in the interior of the brain, they are chambers
filled with CSF which is produced there. Once formed the CSF
circulates through the ventricles and into the subarachnoid space of the
brain.
,●● where does the fourth ventricle drain into?
Answer: the central canal of the spinal cord which also contains CSF
●● what are the meninges?
Answer: three layers of connective tissue membranes that cover and
protect CNS organs and enclose CSF
●● what are the layers of the meninges?
Answer: the outer layer: dura mater
the middle: arachnoid meninx (separated from dura mater by subdural
space) (beneath this is the subarachnoid space which contains blood
vessels and is filled with CSF)
the inner: Pia mater (thin connective tissue tightly attached to the brain)
●● this is the most superficial layer of the brain meninges?
Answer: dura mater (menix)
●● what is cerebrospinal fluid CSF?
Answer: a special fluid formed in the walls of the ventricles from blood
plasma by permeating through the choroid plexus
, ●● what is the choroid plexus formed by
Answer: formed from a network of blood vessels within the ventricles
CSF circulates through the ventricles and into the meninges.
●● what is the blood brain barrier
Answer: a diffusion barrier that prevents most particles from entering
the CNS tissue keeping the brain and spinal cord separate from general
blood circulation
●● what forms the blood brain barrier and what protects it
Answer: formed by the relatively impermeable brain capillaries.
glial cells astrocytes wrap tightly around capillaries to prevent harmful
substances from harming neurons
●● What is the largest portion of the brain?
Answer: cerebrum
comprising about 83% of total brain mass
●● what separates the left and right cerebral hemispheres
Answer: the median longitudinal fissure
●● what are gyri?
Answer: raised ridges of tissue
