When does the ovum develop?
0-2 weeks
When does the embryo develop?
3-8 weeks
When does the fetus develop?
9+ weeks
When is there a heartbeat in a developing child?
4 weeks
When do teeth form in a developing child?
6 weeks
What does the outer cell mass do?
Works as a supporting structure. Surrounds the embryo
What does the inner cell mass do?
It is the embryo
What are the 2 parts of the blastocyst?
Outer and inner cell mass
What non-dental structures make up the mesoderm?
- Bone
- cartilage
- CT
- blood and lymph vessels
- squamous lining of the abdomen and thoracic cavity.
What non-dental structures make up the ectoderm?
- sclera
- skin
- sweat, salivary, and sebaceous glands
- CNS
What non-dental structures make up the endoderm?
- pancreatic glands
- epithelium of digestive and resp. system
- liver
What dental structures make up the mesoderm?
- dentin
- muscles of the tongue
- pulp
- cementum
- PDL
- alveolar bone
What dental structures make up the ectoderm?
- enamel
- anterior 2/3 of the tongue epithelium
What disorder can happen with the ectoderm?
Ectodermal dysplasia
What dental structures make up the endoderm?
posterior 1/3 of the tongue
(make) What cranial nerve innervates the first arch?
- cranial nerve V (5) - trigeminal nerve
- of the maxillary and mandibular arches
(some) What cranial nerve innervates the second arch?
- cranial nerve VII (7) - facial nerve SMILE
(important) What cranial nerve innervates the 3rd arch?
- cranial nerve IX (9) - glossopharyngeal nerve
(shtuff) What cranial nerve innervates the 4th and 6th arches?
- cranial nerve X (10) - vagus nerve. And possibly cranial nerve 11.
(make) What muscles make up the first arch?
- Muscles of mastication
- Mylohyoid
- anterior digastric muscle
- tensor veli palatini
- tensor tympani
(some) What muscles make up the second arch?
- STapedius
- STylohyoid
- muscles of facial expression (SMILE)
- posterior digastric
(important) What muscles make up the third arch?
- styyyylopharyngeus
(shtuff) What muscles make up the 4th and 6th arch?
- larynX
- pharynX
- soft (SHoft) palate
(make) What cartilage/bones make up the first arch?
- malleus
- incus
