Flashcards in Embryology of the Head & Neck Deck (85)
Stomodeum gives rise to the ____.
Frontal nasal prominence gives rise to the ____.
How many pairs of pharyngeal arches form?
1st pharyngeal arch has 2 sub units: ____ and ____.
maxillary and mandibular prominences
Formation of pharyngeal arches is driven by proliferation and migration of ____.
neural crest cells
Pharyngeal arches are covered by ____. lined by ____, with a core made up of ____.
ectoderm, endoderm, mesenchyme
1st pharyngeal arch is innervated by ____.
CN V - Trigeminal
2nd pharyngeal arch is innervated by ____.
CN VII - Facial
3rd pharyngeal arch is innervated by ____.
CN IX - Glossopharyngeal
4th & 6th pharyngeal arches are innervated by ____.
CN X - Vagus
The 1st pharyngeal arch differs from the others, in that it is lined predominantly by ____.
Pharyngeal ____ separate the arches from the outside.
Pharyngeal ____ separate the arches from the inside.
The ____ is where the ectoderm and endoderm come together at the grooves/pouches.
neural crest derivatives of arch 1 - maxillary prominence
facial bones (maxillary, zygomatic, squamous portion of temporal)
neural crest derivatives of arch 1 - mandibular prominence
Meckel's Cartilage - mandible, inner ear bones (incus & malleus), anterior ligament of malleus
neural crest derivatives of arch 2
Reichart Cartilage - lesser cornu of hyoid (superior), stylohyoid ligament, styloid process, stapes
neural crest derivatives of arch 3
body & greater cornu of hyoid (inferior)
neural crest derivatives of arch 4/6
thyroid & cricoid cartilage
mesoderm derivatives of arch 1
muscles of mastication (temporalis, masseter, mylohyoid, ant. digastric, tensor tympani)
mesoderm derivatives of arch 2
muscles of facial expression (buccinator, orbicularis oris, frontalis, etc), stylohyoid, & post. digastric
mesoderm derivatives of arch 3
mesoderm derivatives of arch 4/6
pharyngeal constrictors, m. of soft palate, & m. of larynx
sensory innervation of arch 1
CN V - somatosensation of face, teeth, palate, and ant. 2/3 of tongue
sensory innervation of arch 2
CN VII - taste to ant. 2/3 of tongue
sensory innervation of arch 3
CN IX - taste and somatosensory to post. 1/3 of tongue
sensory innervation of arch 4/6
CN X - taste and somatosensory to pharynx, larynx & esophagus
endoderm derivative of pharyngeal pouch 1
middle ear cavity & auditory tube
endoderm derivative of pharyngeal pouch 2