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Neuroanatomy > Subcortical Fibre Tracts > Flashcards

Subcortical Fibre Tracts Flashcards

1
Q

Boundaries of frontal lobe

A

Dorsolateral surface: Central sulcus (posterior) and lateral/Sylvian fissure (inferior) Medial surface: corpus callosum (inferior) to central sulcus

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2
Q

Boundaries of parietal lobe

A

Dosolateral surface: Anterior = central sulcus; Inferior = lateral sulcus; Posterior = upper half of arbitrary line connecting parieto-occipital sulcus to the pre-occipital notch Medial: Frontal lobe = anterior boundary; Parieto-occipital sulcus and corpus callosum = posterior and inferior boundaries

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3
Q

Boundaries of temporal lobe

A

On lateral surface: Superior boundary = lateral sulcus and its posterior projection, Posterior boundary = lower portion of arbitrary line connecting the parieto-occipital sulcus and the pre-occipital notch 2. On medial surface•Posterior boundary: imaginary line joining the pre-occipital notch andt he anterior end of the calcarine sulcus

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4
Q

Occipital lobe boundaries

A
  1. On lateral surface•Anterior boundary = line joining the parieto-occipital sulcus and the pre-occipital notch On the medial surface:Anterior boundary = the posterior borders of the parietal and temporal lobes
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5
Q

Which structures are found in limbic lobe?

A

1) cingulate gyrus; 2) parahippocampal gyrus 3) hippocampal formation

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6
Q

What is the isthmus

A

Strip of cortex connecting parahippocampal gyrus to the cingulate gyrus

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7
Q

What is BA4

A

Primary motor area -precentral gyrus, presntral sulcus, central sulcus)

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8
Q

What is BA 6

A

premotor or motor association area

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9
Q

What is inferior part of BA 8

A

Frontal eye field - cortical control of gaze

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10
Q

What are BAs 3,1,2 involved in

A

Primary somatosensory cortex (post-central gyrus)

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11
Q

What are BAs 5,7, and 40 involved in?

A

Somatosensory association area – superior parietal lobules extending to medial surface

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12
Q

What are BAs 41 and 42 involved in?

A

Primary association area; superior surgface of superior temporal gyrus; Heschl’s gyrus

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13
Q

BA 22 is involved in which sensation?

A

Audtion; secondary auditory cortex

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14
Q

Which primary area is contained within BA 17?

A

Visual - in walls of calcarine fissure extending onto lateral surface

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15
Q

Which BAs make up the visual association area?

A

BA 18 and BA 19

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16
Q

Which BA is involved in taste?

A

BA 43

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17
Q

Where is taste information integrated with olfactory info?

A

Orbital cortex of frontal lobe and amygdala

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18
Q

Which BAs are involved in Broca’s Area?

A

44 and 45; inferior frontal/angular gyrus (usually left hemisphere)

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19
Q

Which BAs are involved in Wernicke’s areas?

A

22 (superior temporal gyrus) and regions 39 and 40 around the end of the lateral sulcus into the parietal lobe

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20
Q

Which fibre tract connects broca’s and wernicke’s

A

Arcuate fasciculus

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21
Q

Which region is damaged in patients who have difficulty repeating words (conduction aphasia)

A

Arcuate fasciculus

22
Q

Which region is damaged in patients who have difficulty producing individual words, syntax, grammar

A

Broca’s

23
Q

Which region is damaged in patients who cannot comprehend speech and produce non-sensical wordcs

A

Wernicke’s

24
Q

Which region is characterized by BAs 9, 10, 11, and 12?

A

Frontal association - connected w/ DM thalamus

25
Q

Where do fibres from the upper visual field travel after reaching the lateral geniculate nucleus?

A

Lower bank of calcarine sulcus (V1)/BA17

26
Q

Where do fibres from the lower visual field travel after reaching the lateral geniculate nucleus?

A

Upper bank of calcarine sulcus (V1/BA17)

27
Q

Where are the frontal eye fields

A
28
Q

What lies posterior to the frontal eye field

A

Motor-hand area

29
Q

Which thalamic nucleus does auditory info from cochlea project to?

A

Medial geniculate nucleus

30
Q

What is heschl’s gyrus

A

Contains A1; located transversely within lateral sulcus

31
Q

Within which cortex is the gustatory area?

A

Insular

32
Q

Which two lobes are involved in Wernickes area

A

Temporal and parietal

33
Q

What is the non-dominant hemisphere responsible for in language

A

Melody, prosody, accent, tone of voice

34
Q

Unimodal association cortex

A

Involved in higher-order processing of a single sensory of motor modality (e.g., SMA, sensory association area)

35
Q

Heteromodal association cortex

A

Involved in integrating functions from multiple modalities (e/g. sensory and motor)

36
Q

Are Broca’s and Wernicke’s hetero or uni-modal

A

Unimodal

37
Q

What are heteromodal areas?

A

Frontal, parietal, and temporal association areas

38
Q

Where do most commissural fibres cross the midline

A

Corpus callosum

39
Q

Which region of CC connects parietal and posterior frontal lobes?

A

Body

40
Q

Which region of the CC connects occipital lobes and posterior temporal lobes?

A

Splenium

41
Q

What does the genu of the CC connect?

A

2 frontal areas

42
Q

What are 3 commissural fibres?

A

1) CC; 2) anterior commissure; 3) posterior commissure

43
Q

What do association fibres connect?

A

Cortical regions in the same hemisphere (short connect adjacent gyri, long connect other regions like arcuate)

44
Q

Which fibres are in the anterior limb of the IC?

A

Corticopontine, thalamocortical (DM and Ant. nuclei)

45
Q

What is the blood supply to the ANTERIOR limb of the IC

A

Lenticulostriate arteries (deep branches from ACA and MCA)

46
Q

What fibres are carried in the genu of the IC?

A

Corticobulbar

47
Q

What is the blood supply to the genu of the IC?

A

Lenticulostriate (deep branches from MCA) and anterior choroidal

48
Q

What fibres are carried in the posterior limb of the IC?

A

corticopontine; corticospinal (localized) , thalamocortical (from VP, VL, VA)

49
Q

What is the blood supply to the posterior limb of the IC?

A

Lenticulostriate (deep branches from MCA); PCA, anterior choroidal

50
Q

What are projection fibres?

A

Fibres that originate in THALAMUS and project to cortex (via posterior IC) or originate in cortex and project to subcortical nuclei in the cerebral hemisphere, brainstem or spinal cord

51
Q
A

Neuroanatomy (13 decks)

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