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Embryology final

Terms

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Parts of pharyngeal apparatus
-Pharyngeal arches
-Pharyngeal pouches -endoderm
-Pharyngeal grooves - ectoderm
-Pharyngeal membranes - where a pouch meets a groove
First pharyngeal arch forms 2 prominences
-Maxillary prominence
-Mandibular prominence
Pharyngeal arches form when?
4th and 5th weeks of development
First arch cartilage
-Cartilage is known as Meckle's cartilage
-Malleus and incus
-Anterior ligament of malleus and sphenomandibular ligament
-Contributes to formation of mandible
Second arch cartilage
-Stapes and styloid process of temporal bone
-Stylohyoid ligament
-Hyoid bone - lesser horn and superior part
Third arch cartilage
-Greater horn and inferior part of hyoid bone
Fourth and sixth arches cartilage
-Laryngeal cartilage
First arch muscle
-Muscles of mastication
-Mylohyoid and anterior belly of digastric
-Tensor tympani
-Tensor veli palatini
Second arch muscle
-Muscles of facial expression
-Stapedius
-Stylohyoid
-Posterior belly of digastric
Third arch muscle
Stylopharyngeus
Fourth arch muscle
-Muscles of palate
-Muscles of pharynx
-Cricothyroid
Sixth arch muscle
-Laryngeal muscles
-Inferior pharyngeal constrictor
-Skeletal muscle of esophagus
Derivatives of pharyngeal arch nerves
1st - CN V
2nd - CN VII
3d - CN IX
4th and 6th - CN X
First pharyngeal pouch
-This pouch grows outward and contacts ectoderm and will form tympanic membrane and pharyngotympanic tube
Second pharyngeal pouch
Obliterated by growth of palatine tonsils, pouch remains as tonsillar fossa

Deck Info

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