Brain Anomaly

Question 1

Thickening of the endo

MSD = 2-3mm

Answer 1

Fourth Gest week sono findings

Question 2

MSD = 10 mm
Yolk sac seen w/ TV
May vis embryonic disc
May vis cardiac activity

Answer 2

Fifth Gest Week sono findings

Question 3

MSD = 15-20 mm
Yolk sac seen w/ TV
C-Shaped embryo measuring 5 mm
Cardiac Activity should be present

Answer 3

Sixth Gest week sono findings

Question 4

MSD = 30 mm
CRL = 1 cm
Cardiac activity should be present
Head is 1/2 of embryo
Limb buds appear

Answer 4

Seventh gest week sono findings

Question 5

CRL = 1.5 cm
Embryo unfolds
Head becomes dominent
Midgut has herniated into base of umbilical cord
Plac location can be identified
Spine may be identified

Answer 5

Eighth gest week sono findings

Question 6

CRL = 2.3 cm
Can differentiate cerebral hemisphere
Vis limb buds
Early ossification seen

Answer 6

Ninth Gest week sono findings

Question 7

CRL = 3.0 cm
Muscular movement has begun
Hyperechoic choriod plexus
Cystic rhombencephalon demonstrated in posterior fossa

Answer 7

Tenth Gest week sono findings

Question 8

CRL= 5.5 cm
Yolk sac no longer vis
Midgut has returned to abd cavity
Amnion is now abutting the chorion
Fetus demonstrates a skeletal body
Fluid is displayed in fetal sto

Answer 8

Twelfth Gestational week sono findings

Question 9

By ____ w, the neural plate has developed

Answer 9

4.5

Question 10

What structure forms the CNS

Answer 10

Neural Plate

Question 11

Plate gives rise to the neural tube which becomes

Answer 11

spine and brain

Question 12

Prosencephalon(forebrain)
Mesencephalon (midbrain)
Rhombencephalon (hindbrain)

Answer 12

3 Primary vesicles of brain

Question 13

Number of cranial bones connected by sutures

Answer 13

8

Question 14

Seen as hypo spaces b/t bone

Answer 14

sutures

Question 15

Premature fusion of sutures

Answer 15

craniosyntosis

Question 16

Spaces between the fetal bones are termed

Answer 16

fontanelles

Question 17

Anterior fontanelle when filled with bone is

Answer 17

bregma

Question 18

Posterior fontanelle when filled with bone is

Answer 18

lambda

Question 19

opening in the base of the skull which the spinal cord travels

Answer 19

Foramen magnum

Question 20

Largest part of brain

Answer 20

cerebrum

Question 21

Cerebral lobes

Answer 21

6
frontal
2 temporal
2 parietal
occipital

Question 22

Cerebrum is divided into rt and lt hemispheres by

Answer 22

interhemispheric fissure

Question 23

Falx cerebriis located within

Answer 23

interhemispheric fissure

Question 24

Cerebral hemispheres are linked in the midline by the

Answer 24

corpus callosum

Question 25

a thick band of tissue that provides communication between the rt and lt hemispheres

Answer 25

corpus callosum

Question 26

3 meninges cover and protect brain and spinal

Answer 26

Pia mater-innermost Arachnoid membrane-middle layer Dura mater- dense outermost layer

Question 27

Should be completely intact between 18 and 20 weeks

Answer 27

corpus callosum

Question 28

4 parts of corpus callosum ant to post

Answer 28

Rostrum,genu,body and splenium respectively

Question 29

Forms at the same time as the cavum septum pellucidum

Answer 29

corpus callosum

Question 30

Normally when the corpus callosum is absent, the ___ is absent also

Answer 30

CSP

Question 31

Does not communicate with the ventricular system

Answer 31

CSP

Question 32

The closure of this structure is normal in later gestation and often occurs before birth or shortly thereafter

Answer 32

CSP

Question 33

The 2 lobes are located on both sides of the third ventricle

Answer 33

Thalamus

Question 34

The ____ adhesion passes through the third ventricle to connect the two lobes of the thalamus

Answer 34

massa intermedia or interthalamic adhesion

Question 35

Ventricular system function

Answer 35

provide cushion for brain

Question 36

Ventricular system is Lined by a membrane called the

Answer 36

ependyma

Question 37

mass of cells responsible for producing the cerebrospinal fluid in the fetus

Answer 37

Choroid plexus

Question 38

Each lateral ventricle communicates with the third ventricle at the

Answer 38

foramen of Monroe

Question 39

The third ventricle connects to the fourth ventricle by means of a long, tubelike structure called

Answer 39

aqueduct of Sylvius

Question 40

What is located anterior the the cerebellum within the midline of the brain

Answer 40

Fourth ventricle

Question 41

The fourth ventricle has 3 openings through which the CSF travels. 2 openings allow CSO to ______. The other allows CSP to pass from ______ to _____ and ______.

Answer 41

subarachnoid space fourth ventricle to cisterna magna and subarachnoid space

Question 42

Arachnoid villi are responsible for the

Answer 42

reabsorption of CSF into the venous system

Question 43

Located in the posterior fossa of the cranium

Answer 43

CM

Question 44

Appears as an anechoic, fluid filled space, posterior to the cerebellum, between the cerebellar vermis and the interior surface of the occipital bone

Answer 44

CM

Question 45

Located in the posterior fossa of the cranium along w/ CM

Answer 45

Cerebellum

Question 46

Consists of two hemispheres, right and left, joined together at the midline by the cerebellar vermis

Answer 46

Cerebellum

Question 47

The cerebellar tonsils are located on the undersurface of the cerebellum and become distorted with what malformation

Answer 47

spina bifida and Arnold-Chiari malformations

Question 48

The lateral ventricle does not typically measure more than ____ mm at the level of the atrium

Answer 48

10

Question 49

Cerebellum grows at a rate of

Answer 49

1 mm per week between 14 and 21 weeks