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
