Paediatrics unit 1: Ontogenetic development of maxillofacial region

characteristics of maxillary process

-role in secondary palate formation -forms lateral palatine process

which pharyngeal arches form the tongue

1 2 3 4

what nerve is associated with 4th pharyngeal arch

superior laryngeal branch of VAGUS nerve

characteristics of frontonasal process

-forms the median and lateral nasal processes -forms the intermaxillary segment of the palate - forms the nasal septum

maxilla is formed from

2 maxillary processes fronto-nasal process

after gastrulation, how many germ layers does embryonic disc contain

3

when does pharyngeal arches and pouches start forming

4th embryonic week

How many pharyngeal arches are there?

6 but 5th dissapears after formation

when is fetal stage

after 8 weeks to birth

what part of tongue is innervated by pharyngeal arch 1

anterior 2/3 of tongue

bilaminar embryonic disc is between what

between 2 cell layers epiblast and hypoblast

how is primary palate formed

by fusion of median palatine process

How is the palate formed?

by fusion of primary and secondary palat

How is the mesoderm formed?

by migration of epiblast cells through primitive streaks towards hypoblast

what makeup pharyngeal arches

cartilage, nerve, blood vessels and muscles

when is stomodeum formed

day 20-25

when does the lower jaw form

day 30-35 f embryonic development

which layer is inner, outer an middle (ectoderm, endoderm, mesoderm)

ecto- outer endo- inner meso- middle

Which germ layer is stimulated by the notochord to begin transformation into neuroectoderm?

ectoderm

What does the hypoblast form?

endoderm

what part of tongue is innervated by pharyngeal arch 4

epiglottis and adjacent features

what nerve is associated with second pharyngeal arch

facial nerve

which pharyngeal arch is incorporated in another during prenatal development

fifth

which pharyngeal arch forms maxillary process

first

what marks the beginning of stomadeum development

formation of pharyngeal membrane

characteristics of mandibular process

forms the lower jaw and lip

what are the 5 primordia around the stomadeum

frontal prominence maxillary process mandibular process

frontal prominence initiates formation of

fronto-nasal process olfactory placodes median and lateral nasal process

how is upper lip formed

fusion of maxillary process and mesial nasal process

what nerve is associated with 3rd pharyngeal arch

glossopharyngeal nerve

what does pars cranialis form

head

what part of tongue is innervated by pharyngeal arch 2

initial contribution to surface is lost

what does the 6th pharyngeal arch give rise to

intrinsic muscles of the lanrynx

what does the 4th pharyngeal arch give rise to

laryngeal cartilages

what does pars caudalis form

limbs

what is lateral palatine process formed from

maxillary process

What forms the lower jaw?

meckels cartilage 2 mandibular processes

frontal prominence gives rise to formation of

median nasal process lateral nasal process nasal pita

what is the 3rd germ layer

mesoderm

what does the second pharyngeal arch give rise to

muscles of facial expression stylohyoid platysma posterior belly of diagastric

what does the first pharyngeal arch give rise to

muscles of mastication mylohyoid anterior belly of digastric

what are elements of neurolation

neural plate neural tube neural crests

parts of embryonic tube

pars cranialis pars umbilicais pars caudalis

what part of tongue is innervated by pharyngeal arch 3

posterior 1/3 of tongue

what is the stomadeum

primary oral pit

what is gastrulation

process of creation of 3 germ layers occurs week 2 of prenatal development

Stages of Human Prenatal Development

proliferative embryonic fetal

what does the 3rd pharyngeal arch give rise to

stylopharyngeous

what does pars umbilicalis form

torso with organs

characteristics of olfactory placodes

transform into nasal pits localised ectoderm thickening of frontal process

what nerve is associated with first pharyngeal arch

trigeminal nerve

When is the preimplantation stage

week 0-2

when is embryonic stage

week 2-8

what week prenatal does formation of 5 primordia around stomadeum happen

week 4

which week prenatal does tongue begin to form

week 4 prenatal

When does the face develop?

week 4-8

when is maxillo-facial region formed

week 4-8

When is the palate formed?

week 7-9