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27 Cards in this Set
- Front
- Back
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Do most severe congenital birth defects occur from damage during the induction or growth phase of development of that structure?
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induction phase (signaling phase)
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What are the 3 components of each branchial arch?
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cartilage, nerve, artery
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Meckel's cartilage forms in what half of what arch?
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mandibular process of 1st arch
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What 2 bones are formed in place of Meckel's cartilage in the 1st arch?
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Incus, Malleus
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What 2 ligaments come from 1st arch?
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1. sphenomandibular
2. ant. ligament of malleus |
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What is another name for the mandibular arch?
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1st branchial arch
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What is another name for the hyoid arch?
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2nd branchial arch
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In addition to the 4 muscles of mastication, what other 4 muscles come from 1st arch?
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1. tensor veli palatini
2. tensor tympani 3. digastric (ant. belly) 4. mylohyoid |
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What CN innervates 1st arch?
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CN V
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What CN innervates 2nd arch?
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CN VII
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What arch is Reichert's cartilage associated with?
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2nd arch
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What 3 skeletal elements come from 2nd arch?
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1. lesser horn of hyoid bone
2. styloid process 3. stapes |
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What is the only ligament to come from 2nd arch?
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stylohyoid
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What is the only major skeletal element to come from 3rd arch?
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greater horn of hyoid bone
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Besides the muscles of facial expression, what 3 muscles come from 2nd arch?
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1. stapedius
2. digastric (post. belly) 3. stylohyoid |
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What does the auditory tube develop from in the 1st arch?
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pouch of 1st arch
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Are branchial pouches internal or external?
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Internal
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Are branchial grooves internal or external?
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External
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What does the external auditory meatus develop from in the 1st arch?
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groove of 1st arch
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What develops from the pouch of the 2nd arch?
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palatine tonsils
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What develops from the pouch of 3rd arch?
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inferior parathryoid
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What develops from the pouch of 4th arch?
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superior parathyroid
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What CN innervates 3rd branchial arch?
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CN IX (glossopharyngeal)
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What CN innervates 4th branchial arch?
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CN X (vagus)
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Which arch is responsible for forming cricoid and thyroid cartilages?
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4th arch
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Which arch is responsible for forming the 3 pharynx muscles and cricothyroid muscle?
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4th arch
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What forms the tympanic membrane?
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the first pouch (internal) and first groove (external) coming together (the auditory tube and EAM, respectively)
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