Flashcards
Morphogenesis
Flashcards do conjunto (6)
- 1Early 4th week:OUT: head and tail folds
BRAIN: diff of neural tube and 3 vesicles of brain
EAR: otic placodes (surface ectoderm, primordium of int ear)
EYE: optic cup- (neuroectoderm- from forebrain- primordium of retina is formed)
Pharyngeal arches 1 and II
somites - 2end of 4th weekOUT: formn of tail
upper limb buds
BRAIN: forebrain produces a prominent elevation of
the head and folding of into C-shaped
• neuropores closed
EYE: lens placode develops (future lens)
HEART: forms a large ventral prominence and
PUMPS BLOOD
pharyngeal arches III and IV
yolk sac separation
- 35th weekThe main changes are in the head region
BRAIN: • growth of brain vesicles
NOSE: • nasal pits
OUT: • upper and lower limb buds form hand/foot
plates
- 46th weekOUT: • face formation
• upper limbs differentiation (elbow,
digital rays - the primordia of fingers)
BRAIN: • head growth, bents over the large heart prominence
EYE: • retinal pigment is formed, the eye is visible
EAR: • six auricular hillocks around the 1st groove
- 57OUT: • upper limbs elongate and are on
the heart prominence
EYE: • eyelids primordia
MOUTH: • formation of the teeth primordia
GUT: • the intestines enter the umbilical cord
forming the umbilical herniation
- 6—OUT: • fingers are free
• tail disappears
• face is formed
EAR: • auricles are developed
BRAIN: • head is 1/2 of the embryo