Histology

Question 1

what forms the epithelium?

Answer 1

endoderm and ectoderm

Question 2

what forms the nervous tissue?

Answer 2

ectoderm

Question 3

what forms the muscle tissue, connective tissue and specialized C.T.?

Answer 3

mesoderm

Question 4

what does lateral folding form?

Answer 4

somites

Question 5

the muscles of mastication are formed by which pharyngeal arch?

Answer 5

1st arch

Question 6

**pneumocytes type 1&2 are formed by which fetal dermal layer? and why?

Answer 6

endoderm bcz pneumocytes are formed by epithelial cells

Question 7

muscles of facial expression are formed by which arch?

Answer 7

2nd arch

Question 8

what type of epithelium is the vocal cords?

Answer 8

stratified non-keratinized squamous epithelium

Question 9

what forms the palatine tonsils/tonsillar sinus?

Answer 9

2nd pouch

Question 10

what forms from the 3rd pouch?

Answer 10

inferior parathyroid gland

Question 11

what forms from the 4th pouch?

Answer 11

superior parathyroid gland

Question 12

what forms from the elongated 3rd pouch?

Answer 12

thymus

Question 13

the first pharyngeal arch syndrome results from…….?

Answer 13

from insufficient migration of neural crest cells into the first arch during the fourth week

Question 14

what do the 4 grooves contribute to?

Answer 14

1st groove: external acoustic meatus

2,3,4th grooves: cervical sinus

Question 15

the connective tissue in the glands are derived from ………

Answer 15

neural crest cells

Question 16

which gland is the first to appear?

Answer 16

parotid gland

Question 17

what are the five facial primordia that appear as prominences around the stomodeum?

Answer 17

a frontonasal prominence
paired maxillary sinuses
paired mandibular prominance

Question 18

what is the primordial mouth called?

Answer 18

stomodeum

Question 19

what forms the nasal and oral cavities?

Answer 19

fusion of nasal septum and palatine processes

Question 20

what gives rise to pulmonary epithelium and glands of the larynx, trachea, and bronchi?

Answer 20

Endodermal lining of the Laryngotracheal groove

Question 21

The connective tissue, cartilage, and smooth muscle of the trachea are derived from which dermal layer?

Answer 21

splanchnic(visceral) mesoderm

Question 22

the ……… is an abnormal passage between the trachea and esophagus

Answer 22

tracheoesophageal fistula–> leads to esophageal atresia

Question 23

3rd & 4th pharyngeal arches form the ………..

Answer 23

epiglottis

Question 24

parietal pleura is derived from

Answer 24

somatic mesoderm

Question 25

visceral pleura is derived from

Answer 25

splanchnic mesoderm

Question 26

Pharyngeal tonsil (adenoids) located in the ……………

Answer 26

nasopharynx

Question 27

where is the laryngeal inlet found?

Answer 27

trachea and lungs

Question 28

what forms from the laryngeal inlet?

Answer 28

lower respiratory system: trachea, bonchiole, lungs