Normal fetal brain

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Last updated 4:18 PM on 6/7/26
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29 Terms

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Foramen Magnum

Opening at the base of the cranium thats allows spinal canal passage

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cerebrum

Divided into 2 hemispheres RT/LT

<p>Divided into 2 hemispheres RT/LT</p>
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List meninge layers in order

dura matter (outer)

arachnoid

pia matter (inner)

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Falx cerebri

Double layer of dura matter that separates the two hemispheres

<p>Double layer of dura matter that separates the two hemispheres </p>
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Cavum Septum Pellucidum CSP

Box shaped midline brain structure between frontal horns of lateral ventricles

<p>Box shaped midline brain structure between frontal horns of lateral ventricles</p>
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what is a landmark for corpus callosum

Cavum septum pellucidum

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Corpus callosum

Bridge between 2 cerebral hemispheres that provides communication

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Thalamus

2 lobes on either side of the falx cerebri

<p>2 lobes on either side of the falx cerebri</p>
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Massa intermedia

Connects and communicate the 2 thalamus lobes

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Lateral ventricles

Normal- less than 10 mm

Includes choroid plexus

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what makes up the posterior fossa

cerebellum

cisterna magna

nuchal thickness/fold

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cerebellum

2 lobes joined together by cerebellar vermis

<p>2 lobes joined together by cerebellar vermis </p>
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Normal cerebellum measurement

equal to GA wks

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Cisterna magna

Holds CSF

<p>Holds CSF</p>
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Normal cisterna magna measurement

2-10 mm

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Nuchal thickness/ fold

Outer cranium - outer skin

Normal measurement less than 6 mm

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what does head biometry include

Lateral ventricles

3rd ventricle

Falx ceribri

Cavum septum pellucidum

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Most accurate GA measurement in 2nd tri

Head circumference

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Cephalic index

indicates head shape

Ratio of BPD/OFD

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Dolichocephaly

Less than 0.75

Flat

<p>Less than 0.75</p><p>Flat</p>
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Mesocephaly

0.75 - 0.85

Normal

<p>0.75 - 0.85</p><p>Normal</p>
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Brachycephaly

Greater than 0.85

Circular

<p>Greater than 0.85</p><p>Circular</p>
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Midline structures

Cerebellar Vermis

All falxes/fissures

Corpus callosum/ CSP

4th/ 3rd ventricle

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Not midline structures

Lateral ventricles

thalamus

cerebellum

cerebrum

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Where is cerebrospinal fluid (CSF) produced?

Choroid plexus

<p>Choroid plexus </p>
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What is the function of choroid plexus?

Produces and transports cerebrospinal fluid (CSF) to cushion the brain.

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How does CSF flow from the lateral ventricles to the 3rd ventricle?

It flows through the foramen of Monro.

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What connects the 3rd ventricle to the 4th ventricle?

The aqueduct of Sylvius (cerebral aqueduct).

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How does CSF move from the 4th ventricle?

It flows through openings called foramina of Luschka and foramen of Magendie into the cisterna magna and then to the subarachnoid space.