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38 Cards in this Set
- Front
- Back
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cartilage derivatives of 1st branchial arch?
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Meckel's cartilage-position of future mandible
2 middle ear bones-malleus and incus sphenomandibular ligament |
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how does the mandible develop?
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intramembranous ossification
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how do the lear bones develop?
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endochondrial ossification
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cartilage derivatives of the 2nd branchial arch?
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Reichart's cartilage
stapes bone of middle ear styloid process |
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cartilage derivatives of 3rd branchial arch?
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inferior hyoid bone and it's greater horns
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cartilage derivatives of the 4th-6th branchial arches?
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larynx
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muscle derivative of the 1st branchial arch?
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muscles of mastication
anterior digastric mylohyoid tensor veli palatini tensor tympani |
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muscle derivative of the 2nd branchial arch?
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muscles of facial expression
posterior digastric stapedius |
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muscle derivatives of the 3rd branchial arch?
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stylopharyngeus
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muscle derivatives of the 4th branchial arch?
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palatoglossus
constrictors cricothyrois |
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nerve assoc. with the 1st branchial arch?
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V3
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nerve assoc. with the 2nd branchial arch?
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VII
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nerve assoc. with the 3rd branchial arch?
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IX
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nerve assoc. with the 4th-6th branchial arches?
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X
XI-6th |
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the aortic arches remaining in the adult?
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3,4,6
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what does the 3rd aortic arch become?
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internal carotid
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what does the 4th aortic arch become?
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right subclavian or arch of aorta
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what does the 6th aortic arch become?
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pulmonary artery
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what does the 1st pharyngeal pouch become?
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eustachian tube, tympanic cavity, mastoid cavity
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what does the 2nd pharyngeal pouch become?
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tonsillar fossa, palatine tonsil
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what does the 3rd pharyngeal pouch become?
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inferior parathyroid and thymus
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what does the 4th pharyngeal pouch become?
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superior parathyroid and thyroid
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what do the 5th and 6th pharyngeal pouches become?
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absent or rudimentary
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what do the 2nd, 3rd and 4th pharyngeal clefts form before it becomes obliterated?
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cervical sinus
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the five primordia of facial development?
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1 unpaired frontal prominence
2 paired maxillary prominences 2 paired mandibular prominences |
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how does the primitive mouth form?
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depression of surface ectoderm called the stomodeum
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development of the nose?
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nasal placodes(ectoderm) develop on each side of the frontonasal prominence- ridges(nasal prominences) develop around the placodes-placodes lie in depressions called nasal pits
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the three primordia of the palate?
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primary anterior palate from the medial palatine process
posterior part from the lateral palatine processes |
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what structure indicates the division between the parts of the palate?
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incisive canal
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lip development?
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medial nasal processes merge to form intermaxillary segment forming the lip and philtrum
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occurrence of cleft lip and palate?
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1 in 1000 from multifactorial inheritance
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reason for cleft lip or palate?
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teratogenic factors interfere with neural crest cell migration to embryonic facial primordia
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development of the anterior 2/3 of the tongue?
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distal tongue buds-lateral lingual swellings
median tongue bud-tuberculum impar first arch mesenchyme |
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development of the posterior 1/3 of the tongue?
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copula and hypobranchial eminence
2,3 and 4 branchial arch mesenchyme |
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what does the pharyngeal apparatus consist of?
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grooves, pouches and arches
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what are pharyngeal arches composed of?
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skeleton, muscle, nerve and arterial elements
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how do the muscle elements form?
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migration of myoblasts from occipital myotomes to pharyngeal arches
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where does the thyroid start its descent?
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floor of primitive pharynx
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