Telencephalon

Question 1

Telencephalon

Answer 1

Consists of cerebral hemispheres & basal ganglia. Contains the lateral ventricles.

Question 2

Cerebral hemispheres

Answer 2

separated by longitudinal cerebral fissure & falx cerebri, interconnected by corpus callosum & consists of 6 lobes: frontal, parietal, temporal, occipital, insula, limbic (cingulate).

Question 3

Central sulcus of Ronaldo

Answer 3

Transverse sulcus- separating frontal and parietal lobes.
Borders:
Ant: precentral gyrus (motor cortex, frontal lobe)
Post: postcentral gyrus (sensory cortex-parietal lobe)

Question 4

Lateral sulcus of Sylvius

Answer 4

Divides frontal & parietal lobes from the temporal lobe below
Side branches:
1.Ascending (ventrical) ramus
2. Horizontal ramus- subdivided the inf. frontal gyrus into 3 parts.

Question 5

Frontal lobe

Answer 5

From the frontal pole to the central sulcus, above the lateral sulcus.

Question 6

Frontal convex s.f

Answer 6

Precentral gyrus & sulcus
Sup. frontal gyrus & sulcus
Middle frontal gyrus & inferior frontal sulcus
Inf. frontal gyrus- divided by the horizontal ramus into:
- orbital part
-Triangular part
-Opercular part (covers the operculum)

Question 7

Frontal basal s.f

Answer 7

Medial to lateral:
Straight gyrus
Olfactory tract & bulb- in olfactory sulcus
Orbital gyri

Question 8

Frontal medial s.f

Answer 8

Ant. paracentral lobule- paracentral sulcus
Med. frontal gyrus
Parolfactory area (subcallosal)
Paraterminal gyrus: (pencucle of corpus callosum)

Question 9

Parietal lobe

Answer 9

From central sulcus to the occipital lobe. Lies sup. to the temporal lobe.

Question 10

Parietal convex s.f

Answer 10

Postcentral gyrus
Sup. parietal lobule
Inf. parietal lobule: Supramarginal gyrus, Angulae gyrus, Parietal operculum.

Question 11

Parietal medial s.f

Answer 11

1. Post. paracentral lobule- marginal sulcus: separate the post. paracentral lobule from precuneus
2. Precuneus

Question 12

Temporal lobe

Answer 12

From temporal pole to a line connecting the parieto-occipital sulcus & the preoccipital notch.
Lying below the lat. sulcus- extends up to the collateral sulcus

Question 13

Temporal convex s.f

Answer 13

1) Heschl transverse gyri: in the lat. sulcus, extends from sup. temporal gyrus to the MGB
2) Sup. temporal gyrus &sulcus: Wernicke speech
3) Middle temporal gyrus&sulcus
4) Inf. temporal gyrus&sulcus

Question 14

Temporal basal s.f

Answer 14

Lat. occipitotemporal gyrus= Fusiform

Collateral (occipitotemporal) sulcus

Question 15

Occipital lobe

Answer 15

From a line connecting the parieto-occipital sulcus and preoccipital notch to occipital pole

Question 16

Occipital convex s.f

Answer 16

Lat. occipital gyri & sulcus
Lunate sulcus (inconstant)
Transverse occipital sulcus: fom intaparietal sulcus

Question 17

Occipital medial/inferior s.f

Answer 17

Cuneus: b/t parieto-occipital sulcus and calcarine sulcus
Lingual gyrus=med. occipitotemporal- contains the
Calcarine sulcus

Question 18

Calcarine sulcus

Answer 18

At the medial/inf. occipital s.f. Separates the cuneus from lingual gyrus, projects to med. wall of the lat. ventricle as the Calcar avis.

Question 19

Fornix

Answer 19

C shaped bundle of fibers that carries signals from the hippocampus to the mamillary bodies and septal nuclei.
Parts:
1) Fimbria: thin sheath, begins at hippocampus
2) Crura (post. pillars): L&R, has the hippocampal commissure b/t.
3)Body: formed by 2 crura in the mid-line of brain
4)Columns(ant. pillars): L&R, ends at mamillary b. has 2 parts:
a. Visible(libera)-around interventricular foramen of Monro
b. Hidden(tecta)- b/t interventricular foramen & mamillary bodies.