Oral And Head Embryology

Front 1

What is the 2 category of skull bones ?

Back 1

1 neurocrinum = protective covering of the brain.

2 viscerocrinum = bones of the face

Front 2

The neurocrinum is divided into ?

Back 2

Membranous desmocranium

and

cartilagenous chondrocranium

Front 3

When the formation of the cranial base occurs?

Back 3

4th to 8th week of (IUL)

Front 4

The basal portion of that capsule make the cranial base ?

Back 4

Ectomeningeal capsule or ectomenix

Front 5

Which of the following forms the cranial base

Back 5

Ectomeninx

Front 6

The ectomeningeal capsule is converted to cartilage around ?

Back 6

Around 40th day

Front 7

How the desmocrainum appears?

Back 7

Desomocrainum appears in the 4th week of the intrauterine life as a condensation of mesenchym around the developing brain..

Front 8

What that mesenchym is composed of ?

Back 8

The mesenchym that condensed around the developing brain composed of inner endomenix and outer ectomenix

Front 9

What is the orgin of the inner endomenix ?

Back 9

The inner endomenix is of neural crest origin and differentiate into Arkanoid and pia matter..

Front 10

When the several 1mry and 2ndry ossification center develops ?

Back 10

During 8th week

Front 11

Several 1mry and 2ndry ossification centers develops during th 8th week of IUL in ...?

Back 11

The outer layer of ectomenix

Front 12

Several 1mry and 2ndry ossification centers develops during th 8th week of IUL in the outer layer of ectomenix why ?

Back 12

To form individual bones

Front 13

Most of the cranial vaults and a portion of skull base develops through ?

Back 13

Mambranuos ossification.

Front 14

And the of the skull develops through?

Back 14

Chondrification

Front 15

Formation of cartilage means

Back 15

Chondrification.

Front 16

From where th viscerocrinum ?

Back 16

Its develops from the brachial or visceral arches

Front 17

What the dorsal view of skull can show ?

Back 17

Prechordal and paracordal condrocrainum .

Front 18

Major portion of the skull base is developed by

Back 18

endochondral ossification

Front 19

The conversion of mesenchymal cells to cartilage cause in four regions what are they ?

Back 19

1 Paracordal

2 hypophyseal

3 otic

4 nasal

Front 20

The bones of cranial base undergo both ...?

Back 20

Both endochondral and mambranuos ossification

Front 21

What are the bones of the cranial base

That are undergo both endochondral and mambranuos ossification

Back 21

Sphenoid bone

Temporal bone

Ocsipital bone

Front 22

What is the only bone that undergo endochondral ossification.

Back 22

It's the Ethmoid bone

Front 23

A neuruectodermal cells .. which migrates throughout the face and contribute to the embryonic connective tissue

Back 23

Neural Crest cells

Front 24

stomudum is separated from the forget by ..

Back 24

Buccopharengeal membrane

Front 25

When the face begins to develops?

Back 25

By 21th day when th pharyngeal arch develops

Front 26

How many processes the face develops from ?

Back 26

5 processes .. and they exist around the stomatodeum

Front 27

List the mesenchym of th 1st arch ?

Back 27

1 maxilla

2 mandible

3 zygmatic

4 part of Temporal

5 Palatine

Front 28

How the frontonasal process formed ?

Back 28

The mesenchym of the ventral aspect of forebrain and the ectodermal covering of stomatodeuem bulges to form the frontonnasal process (FNP)

Front 29

Where can the max & mand processes can be seen ?

Back 29

They are seen on the lateral & caudal aspect of the stomatodeum

Front 30

How the nasal pits or olfactory pits is formed ?

Back 30

The mesenchym around the olfactory placodes start to proliferate forming a horse shoe ridge called nasal pits

Front 31

What does the medial and lateral arms of the olfactory placodes called

Back 31

The medial arm = medial nasal process

The lateral arm = lateral nasal process

Front 32

Durring the 6th week The nasal pits deepen due to ?

Back 32

Due to the proliferation of the mesenchym surrounding the nasal process and the invagination of Ectoderm into the underlying tissue

Front 33

The depressed area between the medial nasal processes is called ?

Back 33

Frontonasaal process (FNP)

Front 34

The formation of the nasal pits later will producing the?

Back 34

The nasal sacs

Front 35

The Nasal sacs later will develop into ?

Back 35

NASAL CAVITY

Front 36

Before the formation of the palate which separate the nasal cavity from the oral cavity?

Back 36

OroNasal membrane :)

Front 37

In which direction the maxillary process begin to grow

Back 37

Toward midline

Front 38

Which of the following approaches the lateral and medial nasal processes?

Back 38

The maxillary process

Front 39

Howrah frontonasal process is been eliminated

Back 39

Due to the medial graph of the maxillary processes medial nasal processes are pushed to medline .. so the FNP is eliminated.

Front 40

When the OroNasal membrane rapture ?

Back 40

At the 6th week

Front 41

Durring which week A connection is established between the primitive nasal & stomatodeum?

Back 41

Durring 7th week

Front 42

Which of the following forms the meddle middle portion of the nose ?

Back 42

Right and left medial nasal process fused to form the middle portion of nose

Front 43

Its enlargement will form the cheek and the maxillary bone and the zygomatic bone

Back 43

The maxillary process

Front 44

Fusion of the maxillary process qith the lateral nasal process will form

Back 44

The continuity between the future nose and cheek

Front 45

The fusion of 2 medial nasal process gives rise to ?

Back 45

philtrum and premaxilla

Front 46

Premaxilla is associated with

Back 46

Max incisors, primary palate and nasal septum

Front 47

Which of the following forms the ala of the nose

Back 47

The lateral nasal processe LNP

Front 48

Hiw upper lip is formed

Back 48

Mehandibolar processes grows medially and fuse to frome upper lip

Front 49

Ectoderm proliferate into the underlying mesenchym to form a band of epithelial cells called ?

Back 49

Vistibular lamina

Front 50

Why the cells of the vestibular lamina undergo Autolysis ?

Back 50

To establish the labial sulcus and the baccal sulcus