Flashcards in Chapter 12 Head and Neck Deck (22):
Name the 4 components of the embryonic pharyngeal apparatus.
1. Pharyngeal arches
2. Pharyngeal pouches
3. Pharyngeal grooves
4. Pharyngeal membranes
The pharyngeal apparatus is first observed during week _____ of development.
There are f______ pharyngeal arches, f_______ pharyngeal pouches, grooves, and membranes.
Five, Four of each.
The H____ complex and r__________ acid play a role in the formation of facial features and head and neck formation.
Hox, retanoic acid
The pharyngeal arches contain both s_____________ mesoderm and n_________ crest cells. The first gives rise to m__________ and a_____________ including the six primitive aortic arches, the second gives rise to b______ and c_____________ tissue.
Muscles and arteries
Bone and connective tissue
Each of the developing pharyngeal arches has a c__________ n________ associated with it.
Pharyngeal pouches are invaginations of e____________ while grooves are e___________. Membranes are structures of e__________, m______________, n__________ crest, and e__________ between each arch.
Endoderm, mesoderm, neural crest, ectoderm
The thyroid develops from the e____________ lining of the f___________.
The t_________ duct connects the tongue and the developing thyroid during caudally directed thyroid migration, but is o___________ in the adult form. The duct is replaced in the adult by the f____________ c_________.
Thyroglossal, obliterated, foramen cecum.
The pharyngeal pouches are numbered 1-4, and 6 as the fifth pharyngeal pouch r______________ in humans.
What are the fates of the pharyngeal pouches by the 5th and 6th week of development?
1. Tubotympanic recess
2. Palatine tonsil and recess
3. Inferior parathyroid and cervical sinus
4. Superior parathyroid and ultimibranchial body
Name the cranial nerves derived from pharyngeal arches 1-4, 6
1. CN V
2. CN VII
3. CN IX
4. CN X - sup. laryngeal nn
6. CN X - recurrent laryngeal nn
Name the adult derivative of the mesodermic tissue of
pharyngeal arch 1
Mm of mastication
Ant. belly digastric mm
Tensor veli palatini mm
Tensor tympani mm
Name the adult derivative of the mesodermic tissue of pharyngeal arch 2
Mm of facial expression
Post. belly digastric
Name the adult derivative of the mesodermic tissue of pharyngeal arch 3
Common carotid aa
Internal carotid aa
Name the adult derivative of the mesodermic tissue of pharyngeal arch 4.
Mm of the soft palate (w/o T veli palatini)
Mm of the pharynx (w/o stylopharyngeus)
R. subclavian aa
Arch of the aorta
Name the adult derivative of the mesodermic tissue of pharyngeal arch 6
Intrinsic larynx mm (w/o cricothyroid)
Upper esophagus mm
Name the adult derivative of the neural crest cells of pharyngeal arch 1
R1 and R2:
Squamous temporal bone
Name the adult derivative of the neural crest cells of pharyngeal arch 2
Stapes, styloid process, stylohyoid ligament, lesser horn and upper body of the hyoid bone, and Reichart's canal
Name the adult derivative of the neural crest cells of pharyngeal arch 3
R6 and R7: greater horn and lower body of the hyoid bone
Name the adult derivative of the neural crest cells of pharyngeal arch 4
There are none