skull

Question 1

whats the intersection of frontal and two parietals?

parietals and occipital?

Answer 1

bregma

lambda

Question 2

cranial vault is

Answer 2

neurocranium (NOT from visceral arches)

Question 3

face is

Answer 3

splanchoncranium, derived from visceral arches

Question 4

cranial base is

Answer 4

chondrocranium, part of neurocranium (endochondral ossification)

Question 5

what two types of tissues form skull bones

Answer 5

paraxial mesoderm (mesenchyme of mesoderm origin)

and

neural crest cells (mesenchyme of neural plate origin is ectomesenchyne)

Question 6

which bones are made by membranous oss, whats the exception?

Answer 6

membranous nerucorranium - flat bones around brain. cranial vault bones EXCEPT temporal squama

Question 7

what cartilaginous structures come from first arch?

Answer 7

meckels cartilage!!! part of Mandible precursor, degenerates to form sphenomandibular ligament. and the malleus and incus!!

Question 8

what cartilaginous structures come from second arch

Answer 8

Reicherts cartilage!

-forms stapes, styloid process, and part of hyoid

Question 9

what cartilaginous structures come from third arch

Answer 9

portions of hyoid

Question 10

what cartilaginous structures come from fourth-6th archa

Answer 10

laryngeal cartilages

Question 11

what structures come from neural crest cells and are membranous viscerocranium

Answer 11

• maxilla
• zygomatics
• temporal squama

Question 12

what are the 2 types of synarthroses

Answer 12

partly movable:
synchondroses; between cartilaginous (cranial base)

sutures; bweten either cartilaginous /mem