Embryology 1 Flashcards
every gland in our body is what?
some type of epithelium
- an invagination of the epithelium
skeletal muscle is derived from?
SOMITES-
paraxial mesoderm
cardiac muscle is derived from
splanchnic mesoderm
smooth muscle is derived from?
splanchnic mesoderm AND surface ectoderm
nervous system tissue is derived from?
ectoderm +contributions from neural crest cells
schwann cells develop from?
neural crest cells
Connective tissue develops from?
embryonic mesenchyme - a tissue developing mainly from the mesoderm - middle layer of the embryo
intramembranous bone formation? how many times does it occur
TRICK question - only once
after it is termed remodeling process
when does direct ossification begin?
fetal period
mesenchyme that contributes to the formation of most of the skull and all of the facial skeleton is derived from?
cephalic NEURAL CREST CELLS - ECTOMENSENCYME
skull will not form without?
the brain
neurocranium - components and type of bone development?
cranial vault/ calvaria is intramembraneous bone of neural crest cell and paraxial mesoderm origin
cranial base- endochondral bone of neural crest origin and paraxial mesoderm
viscerocranium/face - type of bone development
intramembraneous bone of neural crest origin
masticatory apparatus - type of bone development
compromised of the jaw bones (intramembraneous ossification) and teeth
the skull is formed by…
intramembraneous and endochondral ossification
all through epithelium mesenchymal induction influence
membranous neurocranium bones
frontal parietal and squamous portion of the occipital bone
mesenchymal bone cells derived from?
neural crest cells and somitomeres
base of skull
from cartilaginous neurocranium - initially represented by several sets of paired cartilages
cartilagenous viscerocranium
general
pharyngeal arch 1 and 2
membraneous viscerocranium
general
maxillary process
(superficial)
maxillary process (deep)
Mandibular process
pharyngeal arch 1
cartilagenous viscerocranium
meckels cartilage
malleus
incus
pharyngeal arch II
cartilagenous viscerocranium
reichart’s cartilage
stapes
styloid process
superficial maxillary process components and bone formation type
membranous viscerocranium - squamous part of temporal bone zygomatic maxillary premaxillary nasal lacrimal
maxillary process components and bone formation type
membranous viscerocranium
palatine
vomer
pterygoid
mandibular formation type
membranous viscerocranium
sutures in skull
divide the flat bones in the skull and are separated by neural crest cell derived connective tissue
