Lecture 14: The Brain

Question 1

Contains What Percent Of Body’s Neural Tissue?

Answer 1

97%

Question 2

Average Weight Of Brain

Answer 2

About 3 pounds or 1.4 kg

Question 3

Cerebrum

Answer 3

Largest part of brain,

Divided into left and right hemispheres

Question 4

Gyri

Answer 4

Raised areas of brain,

Increase surface area

Question 5

Sulci

Answer 5

Depressions

Question 6

Fissure Of Brain

Answer 6

Very deep depression,

Separate cerebrum lobes

Question 7

Longitudinal Fissure

Answer 7

Separates cerebral hemispheres

Question 8

Lobes Of Brain

Answer 8

Divisions of hemispheres

Question 9

Lobes (4)

Answer 9

Frontal,
Temporal,
Occipital,
Temporal

Question 10

Gray Matter

Answer 10

Cell bodies of neuron congregated together,

Cerebral cortex and basal nuclei

Question 11

White Matter

Answer 11

Everywhere that there isn’t gray matter,

Axons of neurons

Question 12

Nissl Bodies

Answer 12

Ribosomes,

Rough ER

Question 13

Meninges

Answer 13

Sheets of connective tissue and epithelial tissue that surround he brain and spinal cord

Question 14

Cerebrospinal Fluid

Answer 14

Fluid that brain and spinal cord float in,

Separate from blood

Question 15

Dura Mater

Answer 15

Meninge of CNS,
2 Layers,
Bound to vertebrae,
Most superficial, thickest

Question 16

Venous Sinuses

Answer 16

Between the 2 layers of dura mater,

Drain blood from brain

Question 17

Arachnoid Mater

Answer 17

Extensions toward the brain

Question 18

Pia Mater

Answer 18

Closest to brain,

Anchored by astrocytes

Question 19

Epidural Space

Answer 19

Between 2 dura mater layers,

Venous Sinuses

Question 20

Subdural Space

Answer 20

Between dura mater and arachnoid mater

Question 21

Subarachnoid Space

Answer 21

Between arachnoid and pia mater,
Contains CSF,
Granulations absorb CSF into venous circulation and dumb it into venous sinuses

Question 22

Meningitis

Answer 22

Infection that causes inflammation of meninges

Question 23

Bacterial Meningitis Is _____

Answer 23

Fatal

Question 24

Viral Meningitis Is ______

Answer 24

Non life threatening

Question 25

Dural Folds

Answer 25

Folds of meningeal layers

Question 26

Falx Cerebri

Answer 26

Projects between the cerebral hemispheres into longitudinal fissure

Question 27

Tentorium Cerebelli

Answer 27

Separates cerebellum and cerebrum

Question 28

Falx Cerebelli

Answer 28

Divides cerebellar hemispheres below the tentorium cerebelli

Question 29

Lateral Ventricles

Answer 29

2,

One in each cerebral hemisphere

Question 30

Third Ventricle

Answer 30

Ventricle of the diencephalon,

Lateral ventricles connect to it

Question 31

Fourth Ventricle

Answer 31

Extends into medula oblongata,
Fourth connects to third,
Continuous with central canal of spinal cord

Question 32

Cerebrospinal Fluid

Answer 32

Produced by the choroid plexus in the ventricles,
Carries dissolved gases, nutrients, and wastes,
500 mL produced and absorbed per day

Question 33

Choroid Plexus

Answer 33

A combination of ependymal cells and permeable capillaries

Question 34

Hydrocephalus

Answer 34

CSF not reabsorbed fast enough/at all,

Results only if reabsorption of CSF is impaired

Question 35

Internal Carotid Arteries

Answer 35

Provides brain blood

Question 36

Vertebral Arteries

Answer 36

Supply brain with blood

Question 37

Internal Jugular Veins

Answer 37

Receive blood from dural,

Return blood from brain to heart