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21 Cards in this Set
- Front
- Back
Pharyngeal or Branchial cleft develop from ?
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ectoderm
pharyngeal clefts are grooves that demarcate the pharyngeal arches externally |
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Pharyngeal arches develop from ?
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mesoderm + neural crest
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Pharyngeal pouches develop from ?
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endoderm
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_______ are out-pocketings along the lateral wall of the most cranial part of the gut, extending from the ____ membrane to the commencement of the esophagus.
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Pharyngeal Pouches; buccopharyngeal
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Derivatives of Ist Ph.pouch ?
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Tympanic cavity & auditory tube
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Derivatives of 2nd Ph.pouch ?
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Tonsillar fossa
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Derivatives of 3rd Ph.pouch ?
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Parathyroid and Thymus
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Derivatives of 4th Ph.pouch ?
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Parathyroid and thymus
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Derivatives of 5th Ph.pouch ?
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Ultimobranchial body which gives rise to the parafollicular cells.
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Development of Thyroid Gland
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Develops as a median endodermal downgrowth (thyroid bud) from the floor of the pharynx.
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The thyroid bud grows ventrally and caudally and becomes canalised to form ?
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thyroglossal duct.
Later, it detaches its connection and migrates to the neck. |
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vestigal remnanent of thyroglossal duct?
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foramen cecum of the tongue (located on floor of pharynx and point of origin of thyrogl.duct)
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Development of Thyroid Gland:
Cells of thyroid follicles are ____ whereas CT components are derived from invasion of surrounding ______. |
endodermal; mesoderm
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1st Pharyngeal Clefts forms what?
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forms the external acoustic meatus
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Cleft 2,3, and 4 form what?
What does it persist as? |
form the cervical sinus which normally regress and disappear
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Which pharyngeal pouches combine to form same structures?
What do they form? |
3&4
parathyroid and thymus |
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gives rise to the parafollicular cells
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Ultimobranchial body; via 5th pharyngeal pouch
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4th pharygeal arches form?
(identify muscular and skeletal parts) innervation? |
- Most laryngeal cartilages
- Pharyngeal and laryngeal muscles - Vagus, Medullary part of accessory nerve |
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1st pharygeal arches form?
(identify muscular and skeletal parts) innervation? |
- Mandible (in part)
Malleus & Incus - Muscles of mastication, Digasticus (in part) - Mandibular division of Trigeminal nerve |
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2nd pharygeal arches form?
(identify muscular and skeletal parts) innervation? |
(Hyoid Arch)
- Hyoid apparatus (in part), Stapes - Muscles of the facial expression, digastricus (in part), Stapedius - Facial nerve |
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3rd pharygeal arches form?
(identify muscular and skeletal parts) innervation? |
Third Arch
- form Hyoid apparatus (REMAINING part) -Pharyngeal muscles (in part) - Glosso-pharyngeal nerve |