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32 Cards in this Set
- Front
- Back
Future Nerves and Muscles of First Arch (Mandibular)
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Trigeminal nerve, muscles of mastication, mylohyoid, ant. belly digastric, tensor tympani, tensor veli palatine
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Future Skeletal Structures and Ligaments of First Arch (Mandibular)
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malleus, incus of middle ear, ant. ligament of malleus, sphenomandibular ligament, portions of sphenoid bone
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Future Nerves and Muscles of 2nd arch (hyoid)
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Facial nerve
Stapedius muscle, muscles of facial expression, post. belly digastic, stylohyoid muscle |
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Future Skeletal Structures and Ligaments of 2nd arch (hyoid)
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Stapes and portions of malleus and incus of middle ear, stylohyoid ligament, styloid process of temporal bone, less cornu of hyoid bone, upper portion of body of hyoid bone
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Future Nerves and Muscles of 3rd arches
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Glossopharyngeal Nerve
stylopharyngeal muscle |
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Future Skeletal Structures and Ligaments of 3rd arches
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Greater cornu of hyoid bone, lower portion of body of the hyoid bone
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Future Nerves and Muscles of 4th thru 6th arches
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Superior laryngeal branch and recurrent laryngeal branch of vagus nerve, levator palatine muscles, pharyngeal constrictors, intrinsic muscles of the larynx
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Future Skeletal Structures and Ligaments of 4th thru 6th arches
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Laryngeal cartilages
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Tuberculum impar
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triangular median swelling located in the midline, on the floor of the primitive pharynx, in embryo's conjoined nasal and oral cavities
first indication of tongue development at about 4th week of embryonic life |
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Epiglottic swelling
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farther posterior to the copula, a projection of a 3rd median swelling, develops from mesenchyme of posterior parts of 4th branchial arches.
This swelling marks development of most posterior region of tongue and of future epiglottis |
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Bifid Tongue
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result of lack of fusion of the distal tongue buds (or lateral swellings)
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Parotid Glands
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appear early in 6th week, are the first of the salivary glands to form
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Submandibular Glands
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appear late in 6th week
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Sublingual Gland
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appear in 8th week
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Salivary glands
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begin as epithelial proliferations from the ectodermal lining of the stomodeum.
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Meckel's Cartilage
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First arch cartilage
closely related to developing ear becomes ossified to form the malleus and incus of middle ear, sphenomandibular ligament and portions of the sphenoid bone |
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Reichert's cartilage
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Second arch cartilage
becomes ossified to form the stapes of the middle ear, the styloid process of the temporal bone, the stylohyoid ligament, the lesser cornu of the hyoid bone, and the upper portion of the body of the hyoid bone |
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Third arch cartilage
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osifies to form pary of the hyoid bone
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4th-6th arch cartilages
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fuse to form the laryngeal cartilages
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Upper lip formation
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During 4th week of prenatal development, forms when each maxillary process fuses with each medial nasal process as a result of the underlying growth of mesenchyme
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Frontonasal processes
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during 4th week
bulge of tissue in upper facial area, at most cephalic end of embryo, is the cranial boundary of the somodeum gives rise to upper face (forehead, bridge of nose, primary palate, nasal septum, all structures related to medial nasal processes) |
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Nasal Placodes
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form in anterior portion of frontonasal process, just superior to stomodeum, during 4th week
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Lateral clefting of lip
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results from failure of maxillary and medial nasal processes to fuse
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Mandible
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forms as result of fusion of right and left mandibular processes
first portionof the face to form after the creation of the stomodeum |
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Labial commissures
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fusion of maxillary process on each side of developing face with mandibular arch
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During the 4th wk, 1st branchial arch divides to form:
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The mandibular and maxillary process (maxillary and mandibular prominences)
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Mandibular Symphysis
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faint ridge in midlin on surface of bony mandible where mandible is formed by fusion of mandibular processes
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Branchial (pharyngeal) arches
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stacked bilateral swellings of tissue
inferior to stomodeum durgin 4th week 6 pairs of U-shaped bars with a core mesenchyme formed by neural crest cells that migrate to the neck region |
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1st Pharyngeal Pouch
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Contributes to formation of tympanic membrane, auditory tube, tympanic cavity, mastoid antrum
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2nd Pharyngeal Pouch
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Palatine Tonsils
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Third Pharyngeal Pouch
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Inferior parathyroid glands and thymus gland
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4th Pharyngeal Pouch
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Superior parathyroid glands and ultimobranchial body
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