Term
| What week do pharyngeal arches appear in |
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Definition
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Term
| In what order do pharyngeal arches form |
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Definition
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Term
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Definition
| External clefts and internal pouches |
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Term
| What do every pharyngeal arch consist of |
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Definition
1. Mesenchymal core
2. External ectodermal lining
3. Internal endodermal lining
4. Arch specific cranial nerve
5. Aortic arch artery |
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Term
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Definition
1st arch: maxillary/mandibular
2nd arch: stapes/styloid process/lesser horns & upper rim of hyoid/stylohyoid ligament
3rd arch: greater horn/lower rim oh hyoid
4th arch: laryngeal cartilages
6th arch: laryngeal cartilages |
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Term
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Definition
1st arch: MoM, mylohyoid, ant. belly digastric, tensor veli palatine, tensor tympani
2nd arch: MoFE, post. belly digastric, stylohyoid, stapedius
3rd arch: stylopharyngeus
4th arch: constrictors of pharynx, cricothyroid, levator veli palatine,
6th: intrinsic muscles of larynx |
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Term
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Definition
1st: mand/max trigem
2nd: facial
3rd: glossopharyngeal
4th: superior branch vagus
6th: reccurent branch vagus |
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Term
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Definition
1st: Maxillary (1st aortic arch)
2nd: Stapedial (foetal only)
3rd: common carotid, root o' internal carotid,
4th: arch of aorta |
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Term
Ectodermal derivatives:
1st pharyngeal cleft
remaining 3 clefts |
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Definition
1st: elongated to form ear canal
2nd: obliterated by expanding 2nd arch |
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Term
| What happens when clefts don't disappear? |
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Definition
| Cervical cysts can occur (a.k.a. brachial cysts) |
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Term
| What does the endoderm of the pharyngeal arches contribute to? |
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Definition
| The mucous membranes and glands of the tongue |
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Term
| 1st arch endodermal derivative |
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Definition
| Lateral lingual swellings fuse to form anterior 2/3rds |
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Term
| 2nd arch endodermal derivatives |
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Definition
| no contribution - 3rd arch overgrows this |
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Term
| 3rd arch endodermal derivatives |
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Definition
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Term
| 4th arch endodermal derivatives |
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Definition
| small part of posterior tongue and epiglottis |
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Term
What nerves supply the following tissues of the tongue:
Ant. 2/3
Post. 1/3
Posterior tongue & epiglottis |
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Definition
Trigem
Glossopharyngeal
Vagus |
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Term
| What is a failre of regression of the ventral tongue surface attachment called? |
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Definition
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Term
| What are the derivatives of the FIRST internal pouches of the endoderm?: |
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Definition
| 1st: tympanic cavity (holds ear bones), ear drum (tympanic membrane), auditory tube (links nasopharynx to ear) |
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Term
| What are the derivatives of the SECOND internal pouches of the endoderm?: |
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Definition
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Term
| What are the derivatives of the THIRD internal pouches of the endoderm?: |
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Definition
| Inferior parathyroid gland & thymus |
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Term
| What are the derivatives of the FOURTH internal pouches of the endoderm?: |
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Definition
| Superior parathyroid gland |
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Term
| What is ususual about the thrid/fourth endodermal pouch derivatives |
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Definition
| The superior/inferior parathyroid glands are the wrong way around, however they migrate into the correct position. |
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Term
| When and where does the thyroid gland first appear |
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Definition
| Week 4 as the endoderm proliferation in the foramen caecum |
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