Not the Golden Arches
Pharyngeal arches appear during this developmental week.
4th Week
The dorsal aorta and cardinal veins initially form through this mechanism.
Vasculogenesis
The tympanic membrane forms from which three embryonic tissues?
Ectoderm, mesoderm, endoderm
This depression at the base of the tongue marks the origin of the thyroid gland
Foramen Cecum
The dorsal mesentery suspends the gut tube and is derived from this embryonic structure.
Splanchnic mesoderm
These cells populate the arches to form bone and connective tissue of the face.
Neural Crest
These cells form smooth muscle of aortic arch vessels and guide their patterning.
Neural Crest Cells
These two ossicles arise from Meckel’s cartilage of the first pharyngeal arch.
Malleus and Incus
Name all the cranial nerves that innervate the tongue and their function.
Hypoglossal nerve- This cranial nerve provides somatic motor innervation to all intrinsic and extrinsic tongue muscles except palatoglossus
Mandibular branch of trigeminal- supplies general sensory innervation to the anterior 2/3 of the tongue
Facial Nerve- supplies taste (special sensory) to the anterior 2/3 of the tongue
Glossopharyngeal nerve (for general and taste sensation in the posterior third)
Failure of pleuroperitoneal membranes to close the pericardioperitoneal canal can result in this condition.
Congenital diaphragmatic hernia
Thymic aplasia and conotruncal heart defects characterize this 3rd/4th pouch disorder. What germ layers are involved?
DiGeorge Syndrome, Endoderm and Neural Crest
The fourth aortic arch forms this vessel on the left, and this segment on the right.
Aortic arch (left); proximal right subclavian artery (right)
The epithelial lining of the middle ear cavity is derived from this embryonic germ layer associated with the pouch.
Endoderm
This early communication between nasal and oral cavities is replaced later by the definitive choana.
Primordial choana
This mesodermal plate contributes to the central tendon of the diaphragm.
Septum transversum
This arch contains Meckel’s cartilage.
First
This nerve remains looped under the ligamentum arteriosum on the left due to persistence of the sixth aortic arch.
Left recurrent laryngeal nerve
Disruption in the migration or proliferation of neural crest cells contributing to the first and second pharyngeal arches may result in this congenital external ear malformation spectrum.
Anotia or microtia
This anomaly results from failed fusion of the maxillary and lateral nasal prominences, exposing the nasolacrimal duct.
Oblique Facial Cleft
This exists only in the foregut and gives rise to the falciform ligament and lesser omentum.
Ventral Mesentery
The third pharyngeal pouch gives rise to these two endocrine structures.
Thymus and inferior parathyroids
This form of aortic narrowing occurs distal to the ductus arteriosus and is often asymptomatic due to collateral vessels.
Postductal coarctation
The saccule develops from which germ layer.
surface ectoderm
This midline swelling arises from the first pharyngeal arch and contributes to the anterior tongue but is later overgrown by lateral lingual swellings
Tuberculum Impar
This midline structure contributes mesoderm to the crura of the diaphragm and allows passage of the foregut through the thoracic cavity.
Esophageal Mesentery