Dental Anatomy [Deveploment Of Orofacial Complex] Flashcards
What’re the germ layers of the body
Ectoderm
Mesoderm
Endoderm
Stages of human development
Ovum- fertilization -> 2 wks (germ layers)
Embryo- 3-8
Fetus - 9-36
Teeth, skin, fingernails, eye tissues are formed from which germ layer?
Ectoderm
Muscle, dentin, pulp, ligament blood vessels, lymphatics, connective tissue, bone, cartilage are formed in which germ layer
Mesoderm
Respiratory epithelium, digestive system, liver pancreas, are formed in which germ layer
Endoderm
When can early features of the face been seen?
3 wks
Which layer forms the oral cavity and oral pharynx
Stomodeum at 4.5 wks
The stomodeum is also known as
Primitive oral cavity
What happens at the end of 4.5 wks
Buccal pharyngeal membrane breaks down -> 1st time connection between oral cavity and digestive tract
When can the 3 pharyngeals arches are noted? And what else is noted?
3 wks. Mand arch is divided into max and mand processes. Eye placode noted
What does the mand and max processes form?
Mand -> mandibule
Max -> maxilla, zygomatic bones, palatine bones,
What is noted at 4 wks?
Nasal pits -> medial nasal process
What happens at 6 wks
Medial nasal + Max processes filling up groove to form the upper lip
What happens at 7 wks
Mand processes fuse at the mand symphysis -> mand
Max processes fuse to medial nasal -> upper lip and philtrum of nose
Stomodeum -> mouth
Eye placode-> eye
How is a cleft lip formed and in which week of development
At 6 wks. Separation of medial nasal and max processes (process of migration fails)
