Talk:Paper - Histochemical horizons in human embryos - Stage 13

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EPIDERMIS (cells)

A. B.

General (thin) Limb buds and pharyngeal region (thick)

(1. Basement nienibrune CoNNEc'r1vE TISSUE

A.

B.

Notochord

Cells

Basement membrane Mesoblast (Limb buds)

(J. Mesenehyme

Villi

Body stalk and ventral body Wall

Root of mesentery Mesonephrie ridge Pharynx

Surrounding eye and ear Macrophages

Somites

Dermatome

Myotome

Selerotome

NERVOUS SYSTEM

A.

data

F. G.

Brain

Ventral portion Dorsal portion Spinal cord

Ventral portion Dorsal portion Ganglia

Nerves

Eye

Lens

Retina (Optic evagination) Otie vesicle Sympathetic ganglia (Myenteric plexi)

H. Limiting membrane surround ing central nervous system,

0‘ L YCOGEN

Five Millimeter Embryo

FETUS NO. 5

GLYC()PROTEIN

RIBO—

NUCLEOPROTEIN

ALPHA NAPHTHYI4 ALKALINE PHOS PHATAS E

ALKALINE NAPHTHYL

GLYCERO

PHOS PHATASE

ALPHA

ACID PHOSPHATASE

5-NUCLEOTIDASE

NONSPECIFIC ESTERASE

l+| + +++++l +I+

+ +l+ + +++++I +++ ++ +++I +++

pH 9.4

+ ++

III I

++++rI I+l

1+

I+++ I++

pH 9.0

+ ++

I{+ + +++++l 1+!

++ ++++ +++ I

pH 5.0

+ +

+1

+!+I Ill

pH 7.5

pH 7.8

+1

1l++ II} +

H8

A. rnarynx Epithelium Basement membrane

B Thyroid and thyroglossal duet

C. Lung (epithelium)

D. Gut epithelium Basement membrane Liver cells

Dorsal (eoelomie mesoblast)

Ventral Sinus endothelium Kupifer cells

Capsule (coelomic epithelium) E. Dorsal pancreas and gall bladder

BLOOD VASCULAR SYSTEM A. Heart Muscle Auricle Ventriele Endothelium Auricle Ventricle Myoendoeartlial gelatinous cushion B. Vessels Aorta. Small arteries (Capillary size) Umbilical arteries Cardinal veins Umbilical vein Venous plexi (Limb buds, lateral pharynx, yolk sac) GERm,CELLs BIESONEPHROS Tubules Mesonepl1rie duet CoI<:Lo:\I1e EPITHELIUM

Gut

Parietal

Pleural

Hepatic

Mesonephric

YOLK SAC Endoderm Endothelium CHORION

Syneitial trophoblast

Cytotrophoblast

Connective tissue

Capillaries of stroma

+|

++ ++l +l+I+ ++

++ I

+ ++++ ++ |+

||++1 ++ l+++

1+

lI+ ll+II

II

+ ++ +

+ ++++ +1 ll

lllll ++ +I++

+ (Not foun

++l +++|+

Not foun

\/

++ ++ I

+ ++++ ++ ++ +++++ ++ ++++

+ M + +

+I+l+9 ll

++ I

+ +lI+ l+ +| |[+++ +l +I[[

+|

++[ +l+I+ +l

+|

+ ++++ ++ +| |{+++ ++ +I+I

II

III |+[+l

I!

II

{III I!

ll

lllll +l

++Il

ll

++ )

I

|l++ +| ll

lllll 1+ +lI+

Ill lllll

II

II

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lllll +I

llll