Cerebrum - sulci and gyri

Question 1

Name the median cleft that separates the 2 hemispheres of the brain.

Answer 1

Longitudinal fissure

Question 2

The two hemispheres are connected to each

other by a large commissure =

Answer 2

Corpus callosum

Question 3

Each hemisphere contains an irregular cavity

containing CSF =

Answer 3

Lateral ventricle

Question 4

What does the cerebrum consist of?

Answer 4

• Grey matter (cortex- externally)

- White matter (internally)

Question 5

Describe the cerebral cortex

Answer 5

Cortex is thickest in motor area & thinnest at 
occipital pole (not uniform)

Question 6

What does the cerebrum have?

Answer 6

The cerebrum has convolutions (gyri) and
these are separated by fissures (sulci) of
varying depth (increase surface area)

Question 7

What does the white matter consist of?

Answer 7

The white matter consists of nerve fibres which
transmit impulses to and from the cortical nerve
cells and from one cortical area to another

Question 8

What does the cerebrum enclose?

Answer 8

The cerebrum encloses some larger and smaller masses of
grey matter such as corpus striatum, claustrum,
amygdaloid body

Question 9

The cerebrum consists of 4 lobes, viz:

Answer 9

❑Frontal
❑Parietal
❑Occipital
❑Temporal

Question 10

The cerebrum has 3 surfaces, viz:

Answer 10

➢ Supero-lateral
➢ Medial
➢ Inferior

Question 11

Which sulci divides the supero-lateral surface into the frontal, parietal, occipital and temporal parts?

Answer 11

The supero-lateral Surface is :

Divided into frontal, parietal, occipital and temporal parts by central,
parieto-occipital and lateral sulci

Question 12

SUPERO-LATERAL SURFACE - Frontal lobe - anteriorly :

Answer 12

superior and inferior frontal sulcus dividing

it to superior, middle and inferior frontal gyri

Question 13

SUPERO-LATERAL SURFACE - Frontal lobe - posteriorly :

Answer 13

Pre – central sulcus and Pre- central gyrus

the motor area

Question 14

SUPERO-LATERAL SURFACE - Parietal lobe :

Answer 14

Divided into superior and inferior

parietal lobule by intra-parietal sulcus

Question 15

SUPERO-LATERAL SURFACE - Temporal lobe :

Answer 15

has the superior & inferior temporal sulci
which divides it into superior , middle &
inferior temporal gyri

Question 16

SUPERO-LATERAL SURFACE - Occipital lobe :

Answer 16

divided by transverse occipital sulcus and

consists of superior and inferior Occipital gyri

Question 17

MEDIAL SURFACE - FRONTAL LOBE _ Medial frontal gyrus :

Answer 17

extends above the

cingulate gyrus to the superior border

Question 18

MEDIAL SURFACE - FRONTAL LOBE _ The central gyrus :

Answer 18

on the medial surface
is a continuation from the supero-lateral
surface and its surrounded by the Paracentral Lobule

Question 19

MEDIAL SURFACE - PARIETAL LOBE _Paracentral lobule:

Answer 19

part of it behind

the central sulcus

Question 20

MEDIAL SURFACE - PARIETAL LOBE _ Pre - cuneus :

Answer 20

the area before the

parieto-occipital sulcus

Question 21

MEDIAL SURFACE - OCCIPITAL LOBE _ The cuneus :

Answer 21

bounded superiorly by the
parieto-occipital sulcus and inferior by
the calcarine sulcus

Question 22

MEDIAL SURFACE - OCCIPITAL LOBE _ The lingual gyrus :

Answer 22

lies between the calcarine and the collateral sulcus

Question 23

What does the inferior surface consist of?

Answer 23

smaller anterior and larger

posterior parts

Question 24

What is medial to the olfactory sulcus?

Answer 24

The gyrus rectus

Question 25

Where does the olfactory bulb lie?

Answer 25

On the gyrus rectus

Question 26

Where does the olfactory tract run?

Answer 26

olfactory tract runs in the olfactory sulcus along | side the gyrus rectus

Question 27

Which sulcus is lateral to the olfactory bulb and sulcus ?

Answer 27

An H - shaped sulcus

Question 28

The H-shaped sulcus divides the inferior surface of the cerebrum into :

Answer 28

anterior, | posterior, medial and lateral orbital gyri

Question 29

What is the posterior part[ tentorial area] of the inferior surface partly superior to?

Answer 29

the tentorium cerebelli and | also the middle cranial fossa

Question 30

What is the posterior part[ tentorial area] of the inferior surface traversed by?

Answer 30

the antero-posterior collateral sulcus | laterally) and occipito-temporal sulcus (medially

Question 31

What does the lingual gyrus pass into?

Answer 31

the lingual gyrus passes into the | parahippocampal gyrus anteriorly

Question 32

What does the parahippocampal continue into anteriorly?

Answer 32

anteriorly the parahippocampal gyrus continues | into the uncus

Question 33

The cerebrum consists of 3 poles, viz :

Answer 33

❑Frontal ❑Occipital ❑Temporal

Question 34

Which gyrus does the motor function correspond to?

Answer 34

The precentral gyrus

Question 35

What do the large areas of the motor homunculus represent ?

Answer 35

The muscles | of the hand and face

Question 36

Which cortex does the postcentral gyrus correspond to?

Answer 36

The primary somatosensory cortex

Question 37

Where does the Broca's area or motor speech area lie?

Answer 37

Broca's area, or the motor speech area, lies just above the lateral sulcus in the frontal lobe

Question 38

What does the temporal operculum house?

Answer 38

The temporal operculum houses the primary auditory cortex

Question 39

Where is the visual area situated?

Answer 39

On the posterior pole and medial aspect of the cerebral hemisphere in the occipital lobe

Question 40

In which region is the visual area located?

Answer 40

The region of the | calcarine sulcus

Question 41

The visual is the...

Answer 41

receiving area for visual | impressions