Head and Neck Flashcards
What does the enural crest cells form
connective tissue (bone and cartilage and ligaments)
smooth muscle
what happens during neurlation to form two neurla bridges
vagination of overlying neuroectoderm forming two neurla bridges
what happens to the neural birdges
decends some of the cells will get left behind
what days does each of the pharyngeal arches form
Arch One - 22
Arch two + three - 24
Arch four + six - 29
what is the pargygeal arch made of
mesenchymal tissue
what is the external pharyngeal cleft made of
ectoderm
what is the internal pargyngela pouch made of
enodderm
mesechyme from _____ and _____ _____ ______ form ____
mesenchyme derived from the paraxial and lateral plate mesoderm form the musculature
what does mandibular process form
Meckel’s cartilage (mores to the temporal bone) to stimulate cells to form the mandible
what skeletal derviates are there for the 2nd arch
stapes
styloid process of the temporal bone
stylohoid ligament
lesser horn of the hyoid
upper part of the hyloid body
what are the skeletal dervaited for the 3rd arch
greater horn
lower part of the hyloid
what is the vagus nerve parts for the 4th and 6th arch separately
Arch 4 - superior laryngeal branch
Arch 6 - recurrent laryngeal branch
what does the first cleft form
external acoustic meatus
what does the 2nd - 4th cleft form
loose contact with outside and form the cervical sinus
what does the 2,3,4 leave
leaves a sinus that will oberlierate
