Anatomy: embryology Flashcards
what to endo-, meso-, and ectoderm all become
endo = gut, meso = skin and brain, ecto = surfaces and lining
what are the 3 initial organisations of mesoderm
paraxial, intermediate, visceral
what pouch does the palatine tonsil come from
2nd pharyngeal
where are cervical cysts and fistulas commonly found and when do they present
anterior border of sternocleidomastoid. not seen at birth but enlarges in childhood. (lateral or external)
when does the tongue appear and what is it made of
4th week, 2 lateral swellings and one midline
what causes thryoglossal cysts
inferior migration of thyroid can leave accessory glands/ remnants in it’s course
where do maxilla, mandible, zygomatic and temporal bones originate from
pharyngeal arch 1
where do muscles of mastication originate from
pharyngeal arch 1
where do muscles of facial expression originate from
pharyngeal arch 2
where do upper and mid-facial structures originate from
proliferating mesenchyme ventral to brain
what surrounds the primitive oral cavity at week 4
stomedeum
what forms the nasal placodes
thickening of frontonasal prominence
where is the nasolacrimal groove
between maxillary and lateral nasal prominence
what makes the upper lip (prominences)
2 medial nasal and 2 maxillary
what makes the lower lip (prominences)
manidibular
what makes the nose (prominences)
frontonasal, medial nasal, lateral nasal
how doe nasal cavities form (week 5 and 6)
nasal pits deepen and penetrate mesenchyme. intermaxillary segment is connected by nasal fin, nasal fin opens nasal sac
how doe nasal cavities form (week 7)
nasal and oral cavities communicate via primitive choanae, definitive chonae open due to formation of secondary palate
what does the definitive choana mark
division of nasopharynx and nasocavity
how does secondary palate develop, what happens if this doesnt happen
right and left palatal shelves fuse, clefts
