Cerebral Hemishphere White Matter: Association Fibers

Question 1

Cerebral Hemishphere White Matter

Answer 1

Consists of myelinated nerve fibers which are devoid of neurolemmal sheaths.

Question 2

3 types of fibers

Answer 2

1. Association fibers
2. Commissural fibers
3. Projection fibers

Question 3

Association fibers

Answer 3

Fibers which connect different cortical areas in same hemisphere
2 types:
1. Short
2. Long

Question 4

Short

Answer 4

U-shaped bands (arcutae fibers) which connect adjacent gyri of same brain lobe

Question 5

Long

Answer 5

Tend to collect themselves in fasciculi which connect different distant lobes of same hemisphere

Question 6

Types of long association

Answer 6

1. Cingulum
2. Inferior longitudinal fasciculus
3. Uncinate bundle
4. Superior longitudinal fasciculus
5. Fronto-occipital bundle
6. Arcuate fasciculus

Question 7

Cingulum

Answer 7

C shaped bundle within cingulate gyrus connecting it to parahippocampal gyrus and uncus forming incomplete circle around corpus callosum

Question 8

Inferior longitudinal fasciculus

Answer 8

Lies in cerebral hemisphere inferior surface extending from temporal pole

Question 9

Uncinate bundle

Answer 9

1. Makes an arch over lateral fissure stem
2. Connects frontal lobe (orbital gyri) and temporal lobe

Question 10

Superior longitudinal fasciculus

Answer 10

Connects frontal to occipital pole and adjoining part of temporal lobe

Question 11

Fronto-occipital bundle

Answer 11

Begins in frontal pole passes medial to superior longitudinal bundle and ends in occipital pole

Question 12

Arcuate fasciculus

Answer 12

Connects frontal lobe with temporal lobe cortex (werrnick to broca speech areas)