| Question |
Answer |
| Branchial pouch 1 |
middle ear cavity, eustachian tube, mastoid air cells |
| Branchial pouch 2 |
epithelial lining of palatine tonsil |
| Branchial pouch 3 (dorsal) |
inferior parathyroids |
| Branchial pouch 3 (ventral) |
thymus |
| Branchial pouch 4 |
Superior parathyroids |
| Aberrant development of 3 and 4th pouches |
DiGeorge syndrome: leads to t cell deficiency (thymic aplasia) and hypocalcemia |
| Branchial arch 1 cartilage (Meckel's) |
Malleus, incus, sphenomandibular ligament, mandible |
| Branchial arch 2 cartilage (Reichert's) |
Styloid process, stapes, stylohyoid ligament, lesser horn of hyoid |
| Branchial arch 3 cartilage |
greater horn of hyoid |
| Branchial arch 4 and 6 cartilage |
epiglottic, thyroid cartilage, arytenoids, corniculate, cuneiform |
| Branchial arch 1 muscle |
Mylohyoid, (masseters, temporalis, lateral and medial pterygoids), anterior 2/3 of tongue, anterio digastric belly, tensor tympani, tensor veli palatini |
| Branchial arch 2 muscle |
Stylohyoid, posterior digastric belly, stapedius, muscles of facial expression |
| Branchial arch 3 muscle |
stylopharyngeus, poster 1/3 of tongue |
| Branchial arch 4 muscle |
cricothyroid, levator veli palatini, pharyngeal constrictors, posterior 1/3 of tongue |
| Branchial arch 6 muscle |
Intrinsic laryngeal muscles, no cricothyroid msucle, |
| Congenital pharyngocutaneous fistula |
associated with persistance of 3rd cleft and pouch (tonsillar area) |
| Treacher collins |
1st arch neural crest fails to migrate --> mandibular hypoplasia, facial abnormalities |
| Cleft is made from what tissue derivative? |
ectoderm |
| Arch is made from what tissue derivative? |
mesoderm (muscles, arteries), neural crest (bones, cartilage) |
| Pouch is made from what tissue derivative? |
endoderm |
| Arch 1 (think of ___), 2 etc. |
1 = chewing, 2 = facial expression, 3 = stylopharyngeus, 4 = swallowing, 6 = speaking |
| Superior laryngeal branch ___, Recurrent laryngeal branch ____ |
4th arch, 6th arch |
| 1st cleft |
external auditory meatus |
| 2nd-4th cleft |
temporary cervical sinuses which are olbiterated by 2nd arch |
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