Embryology Concept Map
Epiblast
Layer
Turns into
Ectoderm
(epidermis,
Nervous
Tissue)
Oral Epithelial
Lining of
Stomodeum
Hypoblast
Layer
Mesenchymal
Cells from
epiblast migrate
to form
Mesoderm
(Connective
Tissue, muscle
tissue, Urinary
system)
Neuroectoderm:
(Neural plate,
Neural groove)
Endoderm
(Epithelial lining
of digestive and
respiratory
tracts)
Somites
Bilaminar
Disk
Week 2
Trilaminar
Disk
Week 3
Week 4
cells migrate into mesenchyme
From neural folds
Spinal cord
And future
nervous tissue
Placodes
Neural crest cells:
Ectomesenchyme
*
Brachial
Arch 1
(Mandibular
Arch)
Meckel's Cartilage
(mandible, middle ear
bones)
Lower Lip, mandible,
Mandibular teeth,
Periodontium,
Muscles of Mast,
Anterior 2/3 tongue,
Brachial
Arch
2 (Hyoid Arch)
Week 4
Folding at end of week 4
Brachial Arches
3 and 4
Brachial Arch
5 and 6
Copula
of tongue
Reichert's Cartilage,
(Middle ear, temporal
Bone, hyoid bone)
Muscles of facial
expression
New Section 1 Page 1
Tuberculum
impar
Of the tongue
Epiglottis
Note: Ectoderm
Gives rise to
Future Enamel
Maxillary Process
Sides of upper lip
Secondary palate
Posterior of maxilla
(not incisors)
Zygomatic/ Temp
bones
palate, nasal septum
Medial nasal processes ->
Globular process ->
Intermaxillary segment ->
Primary Palate (premaxilla)
Week 5
Week 6
Week 8
Week 9- 12
Note: Frontonasal
Process gives rise
To medial and
Lateral nasal
Processes, forehead,
Bridge of nose, center
Of upper lip, primary
Note:
Ectomesenchyme
gives rise to Dental
papilla (future
pulp/dentin), and
Dental Sac (future
PDL, Cementum,
Alveolar bone)
Palatal shelves
Palatal Shelves Fuse
together
Palatal shelves fuse with
Primary Palate
New Section 1 Page 2
Copula merges with
Anterior portion of tonguemakes sulcus terminalis.
Tongue depresses into Oral
Cavity Proper