Early Embryo development

Question 1

Connecting stalk

Answer 1

will form the umbilical cord attached to ventral side of embryo.

Question 2

Dermis and subcutaneous layer of skin

Answer 2

Mesoderm

Question 3

Bone/ligamenmt/tendon/cartilage

Answer 3

Mesoderm

Question 4

Mesoderm membrane, expansion, & differentiation

Answer 4

extends beyond oropharyngeal membrane and found in the cardiogenic area near the heart primordium

Question 5

Lateral plate mesoderm

Answer 5

Splanchnic - Organs CT, cardiovasculr and Somatic - Pleura

Question 6

oropharyngeal membrane

Answer 6

future site of the mouth

Question 7

Prechordal plate

Answer 7

where the ectoderm and endoderm fuse, will form oropharyngeal membrane

Question 8

Lateral folding speed differences

Answer 8

Dorsal>ventral

Question 9

cloacal membrane

Answer 9

future site of the anus

Question 10

Cranial Caudal Folding pattern: Other (Head)

Answer 10

Septum transversum, perimoridal heart, pericardial coelom, and oropharyngeal membrane move to ventral surface.

Question 11

Notochordal canal/(tube)

Answer 11

formed from the primitive pit extending into teh notochordal process.

Question 12

Cranial Caudal Pattern: Tail Folding

Answer 12

extends over cloacl membrane,formation of the hindgut, connecting stalk and allantois

Question 13

epithelium of lower anal canal, external auditory meatus

Answer 13

surface ectoderm

Question 14

Lateral folding pattern: lateral folding

Answer 14

Ventrolateral wall fold toward median plane to create cylindrical embryo as spinal cord and somites rapidly grow. Form the midgut and reduce its connection to teh yolk sac via the omphaloenteric duct/vitelline tube

Question 15

sacrococcygeal teratoma

Answer 15

Primitive streak does not disappear. Tumors contain tissues derived from all three germ layers in incomplete stages of differentiation.

Question 16

Epidermis hair nails sweat

Answer 16

surface ectoderm

Question 17

Muscles

Answer 17

Mesoderm

Question 18

CNS

Answer 18

Neuroectoderm

Question 19

Pericardioperitoneal canal

Answer 19

A temporary gap between the pericardial coelom and intraembryonic ceolem

Question 20

Somites

Answer 20

sclerotome, dermatome, myotome

Question 21

Cranial Caudal Folding pattern: Brain (Head)

Answer 21

Develops dorsally into amniotic sac and cranially into oropharyngeal membrane over developing heart.

Question 22

Allantois

Answer 22

Once folded will connect to rudimental GI tract, will connecting to urachus, and form umbilical ligament, the extraembryonic mesoderm of allantois will form umbilical artery/vein

Question 23

Lateral folding pattern: Somatic and splanchnic mesoderm

Answer 23

The somatic mesoderm and embryonic ectoderm will form the somatopleure (body wall) and the mesoderm and endoderm will form splanchnopleure (gut)

Question 24

Cranial caudal speed folding differences

Answer 24

cranial>caudal>body

Question 25

Another name for caudal dysplasia

Answer 25

Sirenomella

Question 26

Gastrulation

Answer 26

forming the trilaminar embryonic disc.

Question 27

Paraxial mesoderm

Answer 27

Head and somite

Question 28

Midgut

Answer 28

formed from lateral folding in the endoderm to create teh small intestine.

Question 29

Foregut

Answer 29

Formed during head folding of cranial caudal pattern from the endoderm. To eventually create pharynx, esophagus, and lower respiratory system.

Question 30

Notochord functions

Answer 30

defines primordial longitudinal axis, provide signals fro axial musculoskeletal structures and CNS, contributes to nucleus pulposus

Question 31

Notochordal plate

Answer 31

floor of notochordal process fuses with the underlying embryonic endoderm

Question 32

Lateral folding pattern: coeiomic spaces

Answer 32

Intraembronyic coelum and extraembryonic coelom are temporarily connected until folding occurs

Question 33

Caudal dysplasia

Answer 33

Abnormal gastruation, disturbed mesoderm migration – especially the fusion of the cloacal membrane.

Question 34

Neurentic canal

Answer 34

notochord process fuses with embryonic endoderm, transitory communication between amnioitic and yok sac. Disappears when notochord is complete.

Question 35

Septum transversum

Answer 35

Will form central tendon fo diaphragm lies caudal to the heart.