Gland-ulous
Largest salivary gland; 25% of salivary volume; secretes serous saliva only and contains only serous acini; empties into the Stenson's duct; develops in the 6-8th week in utero
What is the Parotid gland
Developing human that attaches to the wall of the uterus; morula, or ball of cells, that begins to retain fluid
What is a blastocyst
Rubbery surface; resilient; made up of KERATINIZED stratified squamous epithelium; 4 layers (keratin, granular, prickle, basal)
What is masticatory mucosa
Cylindrical in longitudinal section; have a head and a tail end; become shorter near the CEJ and longer near the incisal edge or cusp tips
What are enamel rods
When the permanent first molars erupt and close primate spaces
What is early mesial drift
Second largest salivary gland; 60-65% total salivary volume; secretes a mixed product (serous acini and serous demilunes); empties into Wharton's duct; develops around 16 weeks in utero
What is the submandibular salivary gland
It it the earliest indication of a tissue type or an organ during prenatal development
What is primordium
ability to stretch and be compressed; soft and moist; NONKERATINIZED stratified squamous epithelium; 3 layers (superficial, intermediate, basal); acts as a cushion for underlying structures
What is lining mucosa
Light and dark bands in enamel; seen microscopically; crystals in each enamel rod oriented differently than in other enamel rods
What are Hunter-Schrager bands
Tooth germ is present; 3 components - enamel organ, dental papilla, and dental sac; still has a basement membrane; 9-10 weeks in utero
What is the cap stage
These papilla have taste buds
What are the fungiform, foliate, and circumvallate lingual papilla.
Chromosomes of the ovum and sperm join creating a new individual with "shuffled" chromosomes, ensures the proper number of chromosomes; half from each parent; only in reproduction
What is meiosis
Deep to the basement membrane; consists of collagen fibers, fibroblasts, capillary plexus; two layers (papillary and dense)
What is the lamina propria
Incremental lines formed from daily deposition of enamel matrix; Neo-natal line is a pronounced one of these
What are lines of Retzius
Part of the oral epithelium that thickens and grows into the underlying ectomesenchyme; will form all the teeth in the oral cavity
What is the dental lamina
minor salivary glands near the circumvallate papilla; flushes out the trenches
What are Von Ebner salivary glands
Cell replication making identical daughter cells
What is mitosis
May contain adipose tissue, glands (salivary/sweat); may or may not be present; deep to the dense layer of the lamina propria
What is the submucosa
Only seen microscopically and have no clinical significance; caused by odontoblasts that line up on the wrong side of the DEJ; blind ends of dentinal tubules
What are enamel spindles
When the 2nd permanent molars erupt closing leway spaces
What is late mesial drift
mixed product; serous demilune; contains a "bonnet" of serous cells superficial to the mucous cells
What is muco-serous acini
What are these three layers called? (3rd week of development)
~ Ectoderm (gives rise to the epidermis of skin, CNS, hair, nails, glands, and tooth enamel)
~Endoderm (becomes the gastrointestinal tract)
~Mesoderm (gives rise to connective tissue: cartilage, bone, blood, muscle, dentin, pulp, cementum, and PDL)
What is the trilaminar disc
Epithelial cells (keratinocytes) produce keratin and may occur naturally or from trauma; NON-keratinized may turn into keratinized (response to chemical trauma or friction); EX: linea alba
What is hyperkeratinization
Contains dentinal fluid; afferent axon only (only pain receptors)
What are dentinal tubules
In this stage the enamel organ is comprised of 4 layers (OEE, IEE, stellate reticulum, and stratum intermedium); shape of tooth is being determined; 11-12 weeks in utero; still has a basement membrane
What is the bell stage