Anatomy Of The Cortex Ii

Front 1

What are short association fibers?

Back 1

1. Form U-shaped arcuate fibers immediately deep to cortex

2. Connect adjacent gyri to each other

Front 2

How are long association fibers organized?

Back 2

1. Collected in bundles or fasciculi

Front 3

What are the 4 bundles of long association fibers?

Back 3

1. Cingulum

2. Superior longitudinal bundle

3. Uncinate bundle

4. Inferior longitudinal bundle

Front 4

What is the beginning, course, and end of the cingulum?

Back 4

1. Begins: below rostrum of corpus callosum

2. Runs: into hippocampal gyrus

3. Ends: in uncus

Front 5

What is the function of the cingulum?

Back 5

1. Associates medial cortical areas with tentorial surface

Front 6

What is the location of the superior longitudinal bundle?

Back 6

1. Lateral to cingulum

2. Extends from frontal pole to occipital bole and adjoining temporal lobe

Front 7

What is the function of the superior longitudinal bundle?

Back 7

1. Connects various cortical areas on lateral surface of hemisphere with each other

Front 8

What is the location of the uncinate bundle?

Back 8

1. Makes arch over stem of lateral fissure

Front 9

What is the function of the uncinate bundle?

Back 9

1. Connects orbital gyri of frontal lobe to anterior part of temporal pole

Front 10

What is the location of the inferior longitudinal bundle?

Back 10

1. Runs horizontally from temporal pole to occipital pole near inferior surface

Front 11

What is the function of the inferior longitudinal bundle?

Back 11

1. Connects various cortical areas on the tentorial surface of the hemisphere

Front 12

What are commissural fibers?

Back 12

1. Connect one part of the CNS on one side of the cerebral hemisphere to the same part on the opposite hemisphere

Front 13

What are the major commissures?

Back 13

1. Corpus callosum

2. Anterior commissure

3. Hippocampal commissure

4. Posterior commissure

5. Habenular commisure

6. Optic commissure

Front 14

What are the parts of the corpus callosum?

Back 14

1. Rostrum

2. Genu

3. Body

4. Splenium

Front 15

What is the lamina terminalis?

Back 15

1. Sheet of grey matter that connects rostrum towards optic chiasma

Front 16

What is the induseum greium?

Back 16

1. Covers lower surface of rostrum of CC

2. Extends upwards on genu and backwards on upper surface of body

Front 17

What forms the forceps anterior?

Back 17

1. Fibers extending forwards from genu and medially into the frontal lobe

2. Crossing of these fibers at the midline

Front 18

What is the function of the rostrum of the CC?

Back 18

1. Connect orbital surfaces of 2 frontal lobes

Front 19

What attaches to the upper surface of the rostrum?

Back 19

1. Septum pellucidum

Front 20

What is the function of the forceps anterior?

Back 20

1. Connect prefrontal areas on either side

Front 21

Where does the septum pellucidum attach to the genu?

Back 21

1. Posterior (deep)

Front 22

What part of the CC forms the anterior horn of the lateral ventricle?

Back 22

1. Posterior (deep)

Front 23

What is the body of the CC?

Back 23

1. Lies at bottom of median longitudinal sulcus

2. Fibers extend transversely to cross midline

3. Fibers then turn upwards and downwards

Front 24

Where does the septum pellucidum attach to the body of the CC?

Back 24

1. Lower surface in median plane

Front 25

To what structures does the lower surface of the body of the CC contribute?

Back 25

1. Roof of anterior horn

2. Central part of lateral ventricle

Front 26

What forms the forceps posterior?

Back 26

1. Splenium fibers extending backwards and medially into occipital lobe

2. Cross midline

Front 27

What forms the bulb of the posterior horn?

Back 27

1. Bulge from fibers of forceps posterior in medial wall of posterior horn of lateral ventricle

Front 28

What forms the tapetum?

Back 28

1. Fibers from splenium that extend laterally and downwards into occipital and temporal lobes

2. Forms roof and lateral wall of posterior horn of lateral vetnricle

Front 29

Over what strucutres does the splenium hang?

Back 29

1. Corpora quadrigemina

2. Pineal body

Front 30

What is the anterior commissure?

Back 30

1. Rounded bundle of fibers that cross midline immediately in front of the column of fornix and behind the lamina terminalis

Front 31

To where does the anterior commissure extend?

Back 31

1. Above anterior perforated substance

2. Below corpus striatum

Front 32

What is the function of the hippocampal commissure?

Back 32

1. Connects hippocampal gyri on both sides

2. Connects crus of fornix on both sides

Front 33

What is the location of the posterior commissure?

Back 33

1. Below stalk of pineal gland

2. Above tectum of midbrain

Front 34

What is the location and function of the habenular commissure?

Back 34

1. Location: above stalk of pineal gland

2. Connects habenular nuclei together

Front 35

What is the function of the optic commissure?

Back 35

1. Connect optic nerves together

Front 36

What is the location of the septum pellucidum?

Back 36

1. Interval between fornix and corpus callosum

2. Forms partition between anterior horns and central parts of lateral ventricles

Front 37

What are projection fibers?

Back 37

1. Afferent and efferent fibers that pass through the internal capsule

Front 38

What is the fornix and hippocampal commissure?

Back 38

1. Arched structure formed by axons of cells of hippocampus

Front 39

What are the portions of the fornix and hippocampal commissure?

Back 39

1. Crus

2. Body

3. Column

Front 40

What forms the alveus?

Back 40

1. Axons of cells from the hippocampus

Front 41

What is the fimbria?

Back 41

1. Fibers of alveus collect medially to form fimbira of hippocampus

2. Found on floor of inferior horn of lateral ventricle

Front 42

What is the crus of the fornix and hippocampal commissure?

Back 42

1. Post-fimbria, fibers emerge from temporal lobe and curve upwards behind the thalamus

Front 43

What is the body of the fornix and hippocampal commissure?

Back 43

1. Right and left crura pass upwards and medially to fuse under splenium to form body

Front 44

What does the column of the fornix and hippocampal commissure form?

Back 44

1. Anterior boundary of interventricular foramen

2. Anterior boundary of 3rd ventricle

Front 45

What forms the common triangular body?

Back 45

1. Bodies of 2 fornices connected above 3rd ventricle and 2 thalami by hippocampal commissure

Front 46

What is the tela choroidea?

Back 46

1. Double layered fold o fpia matter in TS fissure of brain

2. Between body of fornix (above) to upper surface of thalami and roof of 3rd ventricle (below)