Head and neck embryology Flashcards
what do we call a ball of cells
blastula
after formation of trilaminar disc what happens
ectoderm in the midline folds down to form neural tube which forms brain and spinal cord
what are pharyngeal/ branchial arches
Series of arches which develop around the future mouth. Face and neck develop from them
which brachial arch disappears
6 arches develop but number 5 disappears
which tissues make up the branchial arches
ectoderm lines the outside
mesoderm lies in the middle forming cartilage and muscle
endoderm forms pouches between the arches
what nerves forms from the 1st brachial arch
Mandibular branch of trigeminal
what nerves forms from the 2nd brachial arch
facial nerve
what nerves forms from the 3rd brachial arch
glossophargyneal nerve
what nerves forms from the 4th brachial arch
superior laryngeal branch of vagus
what nerves forms from the 6th brachial arch
recurrently laryngeal branch of vagus
which arch do facial muscles develop from
2nd arch as all innervated by the facial nerve
which arch does posterior and anterior digastric muscle develop from
anterior is the first arch and posterior is the 2nd arch
Other structures that develop from brachial arch
tongue, thyroid gland, parathyroid gland, part of the pituitary gland
describe the development of the face
frontonasal process
two maxillary processess
two mandibular processes
two mandibular processes fuse in the midline
how is the nostril formed
ectodermal thickening, pushes inwards or invaginate to form the nasal pit
Further grows downwards and laterally to from the philtrum
