Module 8 : Normal Fetal Anatomy - Brain Flashcards Preview

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Flashcards in Module 8 : Normal Fetal Anatomy - Brain Deck (59)
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1

embryology of brain

- develops from a thickened area of the ectoderm called neural plate at 4.5 weeks LMP

2

when does cranial end closes when

- day 38 (LMP)

3

when'd does caudal when

- day 40 (LMP)

4

parts of the neural tube

- rostral end is the cephalic end
- caudal end is inferior part
- rostral and caudal area is most common to have defects

5

rostral differentiation

- differentiates into three primary vesicles
+ prosencephalon
+ mesencephalon
+ rhombencephalon

6

prosenceohalon

- forebrain
- divides into
+ telencephalon
+ diencephalon

7

prosencephalon - telencephalon

- cerebral hemispheres

8

prosencephalon - diencephalon

- thalamus and hypothalamus

9

mesencephalon

- midbrain
- smallest portion of brain
- creates the cerebral peduncles
- located anterior to aqueduct of sylvius
- anterior to cerebellum vermis
- posterior to thalami

10

rhombencephalon

- hindbrain
- cerebellum and pons (metencephalon)
- medulla oblongata (myelencephalon)

11

cerebellum and pons (metencephalon)

- pons located between the midbrain and medulla oblongata
- pons connects the cerebrum to the cerebellum
- pons means bridge

12

medulla oblongata (myelencephalon)

- extends from pons to spinal cord
- regulates heart rate and respiratory rhythm and blood pressure

13

rhombencephalon - ultrasound

- very first identified structure in embryo
- at 7 or 8 weeks

14

cerebrum - function

- learned behaviour and personality

15

cerebrum - lobes

- 2 frontal lobes
- 2 parietal lobes
- 2 temporal lobes
- 2 occipital lobes
- 2 insula

16

frontal lobe - function

- personality
- voluntary function

17

parietal lobe - function

- peripheral sensory

18

temporal lobe - function

- smell
- taste
- hearing

19

occipital lobe - function

- vision

20

insula lobe - function

- motor and sensory function of organs
- don't see on surface
- medial aspect of brain

21

ventricles

- 4 connecting cavities within the cerebral hemispheres and brain stem
- continuous with the spinal cord cavity
- all cavities contain CSF and choroid plexus

22

ventricular system

lateral ventricles >> foramen of Monroe (INTERVENTRICULAR FORAMEN) >> third ventricle >> aqueduct of sylvius (CEREBRAL AQUADUCT) >> fourth ventricle >> foramen of magendie and luschka >> spinal cord

23

foramen of magendi

- medial aspect og fourht ventricle
- connects to spinal cord

24

foramen of luschka

- 2 foramen
- lateral aspect of the fourth ventricle
- connects with the meniginges of the brain

25

lateral ventricles

- largest
- each body has three horns

26

lateral ventricles location

- in the cerebral hemispheres

27

latera ventricles - horns

- anterior (frontal horns)
+ no choroid plexus locates anterior to foramen of monro
- posterior (occipital) horn
- inferior (temporal) horn

28

lateral ventricles - trigone

- aka atria
- junction of body , occipital and temporal horns form trigone

29

third ventricle - communication

- thin
- communicates with lateral ventricles via foramen of monro (interventricular foramen)
- communicates with fourth ventricle via aqueduct of sylvius (cerebral aqueduct)

30

third ventricles - location

- located between the thalami and inferior to the corpus callosum