Gross anatomy CNS

Question 1

Subiculum

Answer 1

Gray matter area in between the parahippocampal gyrus/cortex, and the CA1 region of the hippocampus.

Question 2

induseum griseum

Answer 2

The supracallosal gyrus, very thin gyrus above the corpus callosum.

Merges with the paraterminal gyrus anteriorly under the genu of the corpus callosum.

Merges with the Fasciolar gyrus (which then merges with the Dentate gyrus) posteriorly under the splenium of corpus callosum.

Question 3

Limbus giacomini

Answer 3

Thin band of gray matter coming off of the uncus of the parahippocampal gyrus, merges with the dentate gyrus.

Question 4

Fornix

Answer 4

Fibers running from the hippocampus
to
the Mamillary bodies AND Septal Nuclei

Fimbria: the initial sheath coming off of the hippocampus

Crux/Crura: the curved posterior portion.

Hippocampal commisure: connects the two crura of the fornices

Body: the horizontal portion of the fornix under the corpus callosum

Columns: The anterior vertical portions, terminate in the mamillary bodies.

The columns have a visible part, which is Anterior to the interventricular foramen of Monro

And a hidden part, which runs deep to the floor of the third ventricle, and is Posterior to the Anterior commisure.

Question 5

hippocampal commisure

Answer 5

aka Commisure of the Fornix

Fibers running between the two hippocampi

Question 6

Parts of the columns of the fornix

Answer 6

Visible part, aka Pars Libera
-anterior to the interventricular foramen of Monro

and

Hidden part, aka Pars Tecta
Within the brain tissue, posterior to the anterior commisure.

Question 7

What sulcus separates the superior parietal lobules and inferior parietal lobule?

Answer 7

The Intraprietal sulcus

Question 8

Parietal lobe gyri

Answer 8

Lateral aspect:

• Postcentral gyrus
• Superior parietal lobule
• Inferior parietal lobule
  - contains the parietal operculum, supramarginal gyrus, and angular gyrus

Medial aspect:

• posterior paracentral lobule
• ———marginal sulcus
• precuneus

Question 9

fasciolar gyrus

Answer 9

very small gyrus that connects the supracallosal gyrus to the dentate gyrus

Question 10

fusiform gyrus

Answer 10

Gyrus on the basal side of the temporal lobe, in between the inferior temporal sulcus and the collateral sulcus

aka the Lateral occipito-temporal gyrus

Question 11

medial occiptotempral gyrus

Answer 11

contains the lingual gyrus of occipital lobe

and the parahippocampal gyrus of temporal lobe.

Question 12

Stria terminalis runs from

Answer 12

The amygdala to the ventral medial nucleus of the hypothalamus.

Question 13

what is the white matter connecting the pes hippocampus to the fimbria

Answer 13

the Alveus of the hippocampus

Question 14

medial and lateral longitudinal stria

Answer 14

Whate matter trancts of the gray matter indusium grisium. Lie on either side of it while it runs over the corpus callosum.

Question 15

What connections run to/from the mammillary bodies in the limbic system

Answer 15

The fornix, the stria terminalis, and the mammilothalamic tract.

Question 16

What are the fiber pathways connecting the limbic system?

Answer 16

The alveus: emerging from the hippocampus and converging to form the fimbria, and then the fornix, which then terminates in the mammilary body.

Commisure of the fornix/hippocampal commisure: connect the two hippocampi

Mammilothalamic tract: Fibers between the mammillary body and the anterior nuclei of the thalamus.

Stria terminalis: From the posterior side of the amydala, running along the roof of the inferior horn of the lateral ventricle, then over the top of the caudate nucleus, to the Ventral Medial nucleus of the Hypothalamus.

Question 17

Stria medullaris thalami

Answer 17

Part of the epithalamus,

Contains Afferent fibers from the Thalamic Septal nuclei and Thalamic Anterior nuclei,

Runs to the Habenula.

Question 18

Anatomic components of the limbic system

Answer 18

Subcallosal gyrus
Cingulate gyrus
parahippocampal gyrus
hippocampus
dentate gyrus
amygdala
mammilary bodies
anterior thalamic nucleus.

Question 19

Midbrain

Answer 19

The midbrain comprises the tectum (or corpora quadrigemina), tegmentum, the cerebral aqueduct (or ventricular mesocoelia or “iter”), and the cerebral peduncles