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FIU - ZOO 3603 - Spring 2018 - ZOO 3603, embryology - Class Notes

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FIU - ZOO 3603 - Spring 2018 - ZOO 3603, embryology - Class Notes

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background image Chapter 9   
Pharyngeal Apparatus, Face, and Neck 
 
•  In Pharyngeal apparatus, we have different structures that are considered  arches.   •  Arches are formed in mesenchyme this is the connective tissue in  embryos.    •  This mesenchyme has 2 different origins one is the mesoderm which is  formed in third week later during 4th week it receives incorporation of 
neural cells.   
•  On top of the neural tube we will have neural crest cells.    •  Figure 4-10 shows the neural tube.  
•  These populate pharyngeal arches specifically.  
•  During the 4th week this contributes to pharyngeal arches.  
•  Mesenchyme has 3 different origins, mesoderm and neural crest cells they 
differentiate in different kinds of cells.   o  It is also a considered a germ layer.     Photo from Lagman book  
Figure 18-2 
•  Chick embryo  shows a neural tube development and on top it has a  formation of crest on the top.   •  This is interesting because neural crest cells are for different structures.  Neural crest cells also give rise to specific part of circulatory system.     Page 160   •  Dorsal View, Lateral View, Ventral View. 
• 
There is a layer of ectoderm that separates one layer from the other.    •  4 pharyngeal grooves that separates one from another.     •  6 is developed a little later.    •  Then we will have another structure that is the pinches.    •  4 pairs of pharyngeal pouches   •  This endoderm layer is the one forming internally from the arches.     •  Mesoderm during the 3rd week, formation of neural crest cells.    •  Lining eternally, we will have pouches.    •  When the endoderm and ectoderm layers approach each other, we will 
have a pharyngeal layer. 
  •  First pharyngeal arch is split in two masses. One will give rise to  maxilla. The other mass will give rise to the mandible.    •  Then the 2st pharyngeal arch will split into two masses.    •  Then we will have the estomodale. 2nd pharyngeal arch will contribute to 
the higher bone. 
 
background image •  In the 1st the mandible is going to form by one cartilage that is known as 
meckel cartilage.
  We will see how it also regresses and gives rise to different parts.   •  First 4 pharyngeal arches form completely at end of 4th week and 
beginning of 5th week. 
    Figure below on same page  •  Pharyngeal cavity is the pharyn. It is the upper or cranial part.  
•  Nasal placode is the first structure that appears in relation to nose. 
  Figure 9-1   •  Can differentiate diff structures of pharyngeal.  
•  We have the neural groove.  
•  You can see the mandible in relation 1st pharyngeal groove.   •  In the other one you will see diff arches.    
Figure 9-2 
•  A picture of a 4-and-a-half-week old human embryo 
•  The forebrain is seen.  
•  Stomodeum is at the level of the forebrain.  
•  You can see the mandible and maxilla 
•  Second pharyngeal arch is present 
•  Ectodermal depression which is called cervical sinus   
Figure 9-3 
•  In figure B, you see how the diff structures of the pharyngeal arches  look. You will see irrigation of these pharyngeal arches.   •  Truncus arteriosus has different pharyngeal arch arteries. These different  ones that irrigate arches     
Figure 9-4 
•  See different pharyngeal pouches that are lining internally.  
•  Trigeminal nerve.  
•  6th pharyngeal arch is innovated   
Figure 9-5 
•  Ventral part of mandible, you see dotted line which resembles meckel  cartilage.   •  The meckel cartilage is the one involved in formation of mandible 
•  We will see how meckel cartilage regresses. 
•  In the dorsal part of meckel cartilage we will see wo very small bones: 
Maileus and Incus.   •  Middle part of pharyngeal part you have formation of this anterior  ligament.  

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School: Florida International University
Department: OTHER
Course: Embryology
Professor: Maria Terreros
Term: Spring 2018
Tags: Biology, Bio, biomajor, biologymajor, Science, embryology, FIU, Florida International University, University, HumanDevelopment, and earlydevelopment
Name: ZOO 3603, embryology
Description: These notes will cover what will be on the second exam
Uploaded: 02/21/2018
3 Pages 14 Views 11 Unlocks
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