White Matter Systems

Front 1

names are applied to collections of axons in the CNS
(give 3)

Back 1

bundle, tract, fasciculus, projection, stria, lemniscus, funiculus

Front 2

Axon bundles may be one-way or two-way. T/F

Back 2

T

Front 3

radiation

Back 3

distributes projections from a more localized area to a broader area

Front 4

intrahemispheric association fiber bundles

Back 4

short arcuate
superior longitudinal fasc.
infer. long. fasc.
cingulum
uncinuate

Front 5

Arcuate (short) fasciculi interconnect _______.

Back 5

close regions such as adjacent gyri

Front 6

The long intrahemispheric association fiber bundles course _______.

Back 6

anteroposteriorly

Front 7

Super. longit. fasciculus connects

Back 7

-parietal, occipital, & temporal with frontal lobe

-connects Wernicke's speech comprehension area with Broca's motor speech area

Front 8

Lesions of the superior longitudinal (arcuate) fasciculus cause

Back 8

problems of speech and language

Front 9

Inferior longitudinal fasciculus connects

Back 9

parietal & occipital lobes with temporal lobe

Front 10

The hook-shaped uncinate fasciculus connects

Back 10

anter. temporal & lower frontal lobes

Front 11

cingulum

Back 11

limbic association tract underlying and paralleling the cingulate and parahippocampal gyri

Front 12

Anterior and posterior commissures are

Back 12

-small cylindrical transverse fiber bundles
-They are near opposite ends of the corpus callosum

Front 13

Anterior commissure crosses

Back 13

midline in the lamina terminalis

Front 14

The anterior commissure interconnects

Back 14

the anterior temporal lobes

Front 15

Corpus callosal fibers interconnect

Back 15

similar areas in opposite hemispheres

Front 16

The anteriormost and posteriormost arching fibers of corpus callosum are called

Back 16

forceps

Front 17

The rostral and caudal ends of the corpus callosum have to accommodate more fibers and are thus ______ in sectional area

Back 17

larger

Front 18

The main parts of the corpus callosum are

Back 18

the genu, body, and splenium

Front 19

The genu turns back under to become the

Back 19

rostrum

Front 20

Corpus callosum lies at the bottom of the

Back 20

longitudinal fissure

Front 21

One way of determining corpus callosum regionalization is by correlating cortical lesion locations with

Back 21

callosum fiber degeneration

Front 22

replaced frontal lobotomy for treatment of intractable epileptic seizure in the field of psychosurgery

Back 22

Callosotomy (commissurotomy)

Front 23

Sparing the _______ may minimize split brain symptoms

Back 23

splenium

Front 24

Absense of corpus callosum produces

Back 24

dissconnection syndromes
("split brain")

e.g., if a lesion is posterior, visual info from the right occiput (left visual field) doesn't reach the left side, so the left side motor speech area can't say what's in the left field.

Front 25

The corona radiata

Back 25

represents fibers to and from the cortex and the diencephalon, brainstem or spinal cord

Front 26

The fibers of the corona radiata narrow down and pass between large gray matter nuclei called

Back 26

basal ganglia

Front 27

Internal capsule passes between

Back 27

lentiform nucleus laterally, and thalamus and caudate nucleus medially
it is continuous with corona radiata superiorly, crus cerebri in the cerebral peduncle of the midbrain inferiorly

Front 28

The internal capsule in horizontal section is

Back 28

"V" - shaped

Front 29

The bend of the "V" is the _____ ; the remaining parts are _____

Back 29

genu/ limbs

Front 30

external capsule

Back 30

a thin white matter sheet just lateral to the lentiform nuc

Front 31

The internal capsule and the external capsules encapsulate

Back 31

the lentiform nucleus

Front 32

Between the external capsule a ____ is a very thin gray structure (claustrum)

Back 32

insula

Front 33

The internal capsule in coronal section is

Back 33

a single oblique line

Front 34

The large central area of white matter (centrum semiovale) in the cerebrum includes

Back 34

the intersections of internal capsule, callosal fibers, and super. longit. fissure

Front 35

MLF

Back 35

important two-way connector in the brainstem
e.g., it connects (coordinates) the motor nuclei for the extrinsic eye muscles

Front 36

The central tegmental tract interconnects

Back 36

reticular regions

Front 37

Large columns (funiculi) of tracts occupy the perimeter of the

Back 37

spinal cord