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Flashcards in Cerebrum Deck (26)
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1

Cerebral cortex

Surprisingly thin layer of grey matter
2-4 mm thick

2

Gyri

AKA convolutions
The folds in the cerebral cortex

3

Fissures

Deepest grooves between folds of cerebrum
Longitudinal (between right and left hemispheres. Falx cerebri)
Transverse (between cerebrum and cerebellum. tentorium cerebelli))

4

Sulci

Shallow grooves between gyri

5

Lateral cerebral sulcus

Between frontal and temporal lobes

6

Central sulcus

Between frontal and parietal lobes

7

Parieto-occipital sulcus

Between parietal and occipital

8

Precentral gyrus

Anterior to central sulcus
Primary motor cortex

9

Postcentral gyrus

Posterior to central sulcus
Primary somatosensory cortex

10

Insula

"5th lobe"
Deep to parietal, frontal and temporal lobes. Within lateral cerebral sulcus

11

Three types of cerebral white matter:

1. Association tracts
2. Commissural tracts
3. Projection tracts

12

Association Tracts

Axons that conduct impulses between gyro in the same hemisphere

13

Commissural Tracts

Axons that conduct impulses between corresponding gyri in different hemispheres

14

3 major commissural tracts

1. corpus callosum
2. anterior commisure
3. posterior commisure

15

Projection Tracts

Axons that conduct nerve impulses between the cerebrum and lower parts of the CNS

16

Largest fibre bundle in the brain

Corpus callosum

17

Basal Nuclei

Three grey matter nuclei within each cerebral hemisphere
1. globus pallidus
2. putamen
3. caudate nucleus

Interface between cortex and limbic system.
Receives input from cerebral cortex, and send output to motor cortex

18

Lentiform Nucleus

In basal nuclei

globus pallidus + putamen

19

Corpus Striatum

In basal nuclei

lentiform nucleus + caudate nucleus

20

Claustrum

Thin sheet of grey matter next to putamen
Function unknown

21

Functions of basal nuclei

1. regulates initiation and termination of movement
2. suppresses unwanted movement; regulates muscle tone
3. controls nonconscious contractions of skeletal muscle
4. influence some cognitive processes (initiating/terminating attention, memory, planning)

22

Axons from substantial nigra terminate

In caudate nucleus and putamen

23

Limbic System

"emotional brain"
Also involved with olfaction and memory

Composed of:
Limbic lobe
Dentate gyrus
Amygdala
Septal nuclei
Mammillary bodies (hypothalamus)
Anterior and medial nuclei (thalamus)
Olfactory bulbs
Fornix, stria terminalis, stria medialis, medial forebrain bundle and mammillothalamic tract

24

Hippocampus

In limbic lobe (within parahippocampal gyrus)
Strongly involved in memory
Can undergo neurogenesis

25

What two parts of the limbic system can undergo neurogenesis?

Hippocampus
Dentate gyrus

26

What part of the brain is involved in fear conditioning?

Amygdala