Final Review from 11/9/17 Flashcards
The gubernacular cord is a thin connective tissue that goes from where to where?
From the oral epithelium to the tooth follicle
What is the function of the gubernacular cord?
It is the pathway for tooth eruption
Name the 3 hard tissues that make up the tooth
- Enamel (from ectoderm)
- Cementum
- Dentin (from ectomesenchyme)
What’s the origin of osteoblasts?
They come from ectomesencyme, which is from the neural crest
Where do osteoclasts come from?
They come from monocytes, which are hematopoietic cells
What’s the process called where you turn ectoderm into ectomesenchyme?
Epithelial-mesencymal transformation (EMT, histodifferentiation)
What tissue do NCCs come from?
Ectoderm
What are the two structures in the head that are not made from ectomesenchyme?
Enamel and occipital bone
Where does enamel come from?
Ectoderm
What nerve supplies the motor supply of the tongue?
CN 12, hypoglossal nerve
What CN supplies the anterior 2/3 of the sensation of the tongue?
CN 5, trigeminal nerve (from the 1st arch)
What nerve supplies the anterior 2/3s of the tongue for taste?
The chorda tympania (a branch from the facial nerve, CN VII)
What nerve supplies the posterior 1/3 of the tongue for sensory, as well as its sense of taste?
CN 9, the glossopharyngeal nerve (from the 3rd arch)
Describe the process of amelogensis (also called Tome’s process)
Whereby ameloblasts lay down mineralization
What is the fundamental structure of enamel? What makes up the source?
Rods, made of hydroxyapatite
What’s in the pulp?
Pulpal core, nerve trunks and blood vessels
Where does the root canal terminate?
The apical foramen
What forms dentin>?
Odontoblasts
What’s the name of the bone that lines a tooth socket?
Lamina dura (also it is the alveolar bone proper)
What’s the condition called where the tooth root fuses to the socket?
Ankylosis
What is PDL made of?
Collagen fibers, which is CT
What forms PDL?
Fibroblasts
What ligament is associated with PDL?
Ectomesenchyme
What structure attaches the periodontal ligament (PDL) to the tooth socket and the tooth?
Sharpey’s fibers
What plexus of nerves serves in the tooth?
Trigeminal nerve (which is from the 1st branchial arch)
The neonatal line in enamel is larger than the rest of what in the enamel?
The rest of the striae of Retzius
