Brain Anatomy: Inferior Surface and Occipitotemporal Gyri

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Questions and Answers

What is the shape of the uncus?

Circular

Triangular

Square

Hook (correct)

What is the function of the gyrus rectus?

Houses the olfactory sulcus

Divides the orbital surface into 4 orbital gyri

Forms the medial margin of the orbital surface (correct)

Regulates speech

What is the boundary of the interpeduncular fossa anteriorly?

Cerebral peduncles

Pons

Optic tracts

Optic chiasma (correct)

What is contained in the interpeduncular fossa?

Tuber cinereum, infundibulum, and pituitary gland Signup and view all the answers

What cranial nerve emerges from the midbrain?

CN III Signup and view all the answers

Which region is responsible for spatial awareness of the body?

Parietal Lobe Signup and view all the answers

What is the function of Broca's area?

Speech muscles Signup and view all the answers

Which region is involved in language processing?

Wernicke's area Signup and view all the answers

What is the shape of the corpus callosum?

C-shaped Signup and view all the answers

Which sulcus separates the frontal and parietal lobes?

Line from tip of central sulcus to body of corpus Signup and view all the answers

What is the function of the insula?

Sensory link to emotions and memory Signup and view all the answers

What is the name of the gyrus that curves around the corpus callosum?

Cingulate gyrus Signup and view all the answers

Which region is separated from the occipital lobe by the parieto-occipital sulcus?

Precuneus Signup and view all the answers

What is the name of the sulcus that passes from the occipital pole to join the parieto-occipital sulcus?

Calcarine sulcus Signup and view all the answers

What is the name of the gyrus that lies below the diencephalon and is limited laterally by the collateral sulcus?

Parahippocampal gyrus Signup and view all the answers

What is the name of the region that is surrounded by the paracentral sulcus?

Paracentral lobule Signup and view all the answers

Which of the following sulci divides the temporal lobe into superior, middle, and inferior temporal gyri?

Sup. and Inf. temporal sulci Signup and view all the answers

What is the name of the gyrus formed by the post-central sulcus?

Post-central gyrus Signup and view all the answers

What is the term for the 'lid' or 'covering' in the operculum?

Latin Signup and view all the answers

Which of the following is NOT a part of the inferior frontal gyrus?

Parietal part Signup and view all the answers

What is the name of the bulge formed by the tip of the parieto-occipital sulcus?

Para-occipital arcus Signup and view all the answers

Which of the following sulci is located between the frontal and parietal lobes?

Central sulcus Signup and view all the answers

What is the name of the gyrus formed by the post-central sulcus and the post-ramus of the lateral fissure?

Supramarginal gyrus Signup and view all the answers

Which of the following is a feature of the interpeduncular fossa?

A fossa on the inferior surface of the brain Signup and view all the answers

Study Notes

Inferior Surface of the Brain

The parahippocampal gyrus bends and expands medially, forming the uncus
The occipitotemporal sulcus divides the region into medial and lateral occipitotemporal gyri
The orbital surface of the frontal lobe features the gyrus rectus, which is limited laterally by the olfactory sulcus
The H-shaped orbital sulci divide the rest of the orbital surface into four orbital gyri: anterior, posterior, medial, and lateral
The interpeduncular fossa is bounded by the optic chiasma, optic tracts, cerebral peduncles, and pons
The fossa contains the tuber cinereum, infundibulum, pituitary gland, mammillary bodies, posterior perforated substance, and CN III emerging from the midbrain

Functional Localization of the Cerebral Cortex

The frontal lobe is involved in motor and sensory functions
The parietal lobe is involved in spatial awareness of the body
The temporal lobe is involved in auditory and visual processing
The insular cortex is involved in sensory links to emotions and memory
Broca's area is involved in speech production
Wernicke's area is involved in speech comprehension

Topography of the Medial Surface

The corpus callosum is a C-shaped structure with tapered anterior and rounded posterior ends
The corpus callosum is divided into four parts: splenium, body, genu, and rostrum
The area below the corpus callosum is the diencephalon
The line from the tip of the central sulcus to the body of the corpus callosum separates the frontal and parietal lobes
The line from the pre-occipital notch to the splenium of the corpus callosum isolates the temporal lobe

Topography of the Medial Surface: Sulci and Gyri

The cingulate gyrus curves around the corpus callosum between the callosal sulcus and cingulate sulcus
The area above the callosal sulcus is divided by the inflected sulcus into the medial frontal gyrus and paracentral lobule
The precuneus is separated from the occipital lobe by the parieto-occipital sulcus
The calcarine sulcus passes from the occipital pole to join the parieto-occipital sulcus and continues as the occipitocalcarine sulcus
The triangular area between the two sulci is the cuneus
The lingual gyrus marks the lower edge of the medial surface between the calcarine sulcus above and the collateral sulcus below

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Description

This quiz covers the topography of the inferior surface of the brain, including the parahippocampal gyrus, uncus, and orbital surface of the frontal lobe. Learn about the different gyri and sulci that make up this region.