Shared Flashcard Set

Details

fall 2008- Embryology histology
prenatal
20
Health Care
Professional
10/30/2008

Additional Health Care Flashcards

 


 

Cards

Term

Name the three common things that occur in week 4

Definition
  1.  
    1. embryonic folding
    2. foregut
    3. midgut and hindgut
Term

Describe the layers that form the long hollow tube which forms the furture digestive tract in order

Definition

embryonic folding turns the endoderm into a tube with these three layers

  

  1. endoderm-inside
  2. ectoderm-outside
  3. mesoderm-middle
Term
What is embryonic folding?
Definition

Discs fold into the embryo establishing the human axis and placing the tissue in their proper positions for further embryonic development.  Forming the hollow digestive tract

Term
Foregut
Definition
Anterior portion of the tube, which forms the primitive pharynx, throat
Term
Midgut and Hindgut
Definition

posterior portion of the tube, form the rest of the pharynx, as well as the remainder of the digestive tract

Term
Trila Describe the layers of the trilaminar embryonic discminar embryonic disc
Definition
  1.  
    1. Mesoderm – gives rise to muscle coats, connective tissues, vessels supplying tissues and organs, and other tissues. 
    2. Ectoderm – from epiblast layer.  Gives rise to the epidermis of the skin, the nervous system, and other structures.
    3. Endoderm – from hypoblast layer.  Gives rise to the epithelial linings of the respiratory passages and digestive tract, including some glandular organ cells.
Term
Pharyngeal Pouches
Definition

four well defined pairs of endodermal evginations

(balloonlike structure) between the branchial arches

Term

Describe the four pouches that make up the pharyngeal pouches

 

Definition
First pharyngeal pouches – become the auditory tubes.Second pharyngeal pouches – form palatine tonsillar tissue.Third and Fourth pharyngeal pouches – form the thymus gland and parathyroid glands
Term

Cleft palate

Definition
  •  
    • occurs with failure of fusion of the palatal shelves with the primary palate
    • isolated forms of cleft palate are less common than cleft lip, and are more common in females
Term
how does the tongue start out?
Definition

begins as a triangular median swelling

tuberculum impar (median tongue bud)

 

Term
Location of tongue
Definition
  •  
    •  
      • midline
      • floor of primitive pharynx

 

Term
What is the second stage of tongue development
Definition
  • lateral lingual swelling of distal taste buds on each side of the tuberculum impar

 

  • the two swelling fuse and encompass the tuburculum impar to form the anterior 2/3, or body of the tongue

 

Term
Describe the base of the tongue?
Definition
immediately posterior to the   fused lateral lingual swellings, a pair of swellings   called the Copula becomes evident.  The copula
  • Immediately posterior to the fused lateral lingual swellings, a pair of swellings called the Copula becomes evident. 
  • The copula grows to form the base of the tongue
   grows to form the base of the tongue
Term
Epiglottic swelling
Definition

a third median swelling even farther posterior to the copula, that marks the most posterior region of the tongue and of the future epiglottis

Term

Definitive Tongue –

Definition

the copula merges with the swellings of the tongue body, which is superficially demarcated by the Sulcus Terminalis in the mature tongue.  This inverted V-shaped groove marks the the border between the base of the tongue and its body

Term

Foramen Cecum

Definition
the beginning of the thyroglossal duct which is the origin of and pathway showing the thyroid gland’s migration into the neck region
Term
Stomodeum
Definition
  •  
    • Future oral cavity proper.
    • Origin/method: ectodermal depression that is enlarged by the disintegration of the Oropharyngeal Membrane. 
    • Enlargement allows access to the Primitive Pharynx
Term
what type of catilage forms on either side of the mandibular arch
Definition
Meckel Cartilage
Term
Neural crest cells
Definition

another specialized group of cells develop from neuroectoderm.  Involved in the development of many face and neck structures, such as the branchial arches.

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