Wk.12 L2 4 Tissue Types Revisited Flashcards
(40 cards)
What are the four basic tissue types?
Epithelial, muscular, neural, and connective tissue.
What is histogenesis?
The process by which different tissues form from undifferentiated cells in an embryo.
From which layers do tissues arise during histogenesis?
Ectoderm, mesoderm, and endoderm.
What is gastrulation?
The process that forms the trilaminar germ disk from the epiblast.
What is neurulation?
The formation of the neural tube from the neuroectoderm.
What is EMT?
Epithelial-Mesenchymal Transition, where epithelial cells become migratory mesenchymal cells.
What does epithelial tissue do?
Lines body surfaces and cavities.
What is the function of muscular tissue?
Specialized for contraction and movement.
What is the role of neural tissue?
Transmits information.
What does connective tissue do?
Supports and connects other tissues and organs.
What forms from the ectoderm?
Epidermis, lens, inner ear, hair, nails, mammary glands, CNS, retina, neural crest cells.
What forms from the mesoderm?
Muscles, bones, connective tissue, blood, dermis, urogenital system, lymphatic and blood vessels.
What forms from the endoderm?
Epithelia of respiratory and digestive tracts, tonsils, thyroid, liver, pancreas, bladder.
What is the blastocyst composed of?
Inner cell mass (epiblast and hypoblast) and trophoblast.
What does the epiblast give rise to?
All three germ layers: ectoderm, mesoderm, and endoderm.
What is the neuroectoderm?
A specialized region of ectoderm that forms the neural tube and neural crest.
What is the epidermal ectoderm?
The part of ectoderm that forms skin and related structures.
What is the role of neural crest cells?
They form cranial and sensory ganglia and head mesenchyme.
What is the significance of EMT in development?
It allows cells to migrate and form new tissues and organs.
What adult processes involve EMT?
Wound healing, cancer metastasis, and fibrotic diseases.
What happens during implantation?
The blastocyst embeds into the uterine wall.
What is the trilaminar germ disk?
The three-layered structure formed during gastrulation.
What is the function of the trophoblast?
It contributes to placenta formation.
What is delamination in EMT?
The separation of cells from the epiblast to form mesoderm.
