Chick Embryo

(1)

Ramos, Joseph Earl Asunada

4Biology-4

Development of Chick Emryo

!emranes !emranes "tructures "tructures #4#4 hr hr $$ $$ hr hr 4% 4% hr hr &# &# hr

hr ''aatte e ((tthheer r nnoottees s AAnntteerriioor r ))oosstteerriioorr Somatopleure

Somatopleure

// //

Forms chorion

Forms chorion, amnion and part of , amnion and part of thethe body wall, consists of ectoderm and body wall, consists of ectoderm and

somatic mesoderm somatic mesoderm Lateral plate Lateral plate mesoderm mesoderm Splanchnopleu Splanchnopleu re re // //

Forms the yolk sac, allantois and part of Forms the yolk sac, allantois and part of

the body wall the body wall

Consists of endoderm and splachnic Consists of endoderm and splachnic

mesoderm mesoderm Lateral plate Lateral plate mesoderm mesoderm S

Soommiitteess // // // Gives rise to the epimeres: Dermatome,Gives rise to the epimeres: Dermatome, sclerotome and myotome

sclerotome and myotome

n either side of n either side of the neural tube

the neural tube !esenchyme!esenchyme

"nse#mented "nse#mented mesoderm mesoderm $

$yyppoommeerreess // Delaminates into the splanchnic andDelaminates into the splanchnic and somatic mesoderm

somatic mesoderm "nse#mented

"nse#mented mesoderm

mesoderm // // FFoorrmmsstthheessoommiitteess SSoommiitteess %

%rrooaammnniioonn // // &ncorporated into amnion, over#rown&ncorporated into amnion, over#rown and dissapears

and dissapears Surrounds headSurrounds head '

'mmnniioottiic c ffoolldd // Gives rise to the amnion (inner) andGives rise to the amnion (inner) and chorion (outer)

chorion (outer) *

*olk sacolk sac // / / // Does not pDoes not persistsersists +nclosin# +nclosin# the yolkthe yolk

%leuropericardi %leuropericardi al membranes

al membranes // // %%eerrssiissttss

+nclosin# the +nclosin# the common cardinal common cardinal vein vein Seperates pleural Seperates pleural from pericardial from pericardial cavities cavities Brain region Brain region "tructures "tructures #4#4 hr hr $$ $$ hr hr 4% 4% hr hr &# &# hr

hr ''aatte e ((tthheer r nnoottees s AAnntteerriioor r ))oosstteerriioorr 

eeuurraal l ppllaattee // ffoorrmms s tthhe e nneeuurraal l ##rroooovve e aannd d ffoollddss eural #rooveeural #roove and folds and folds 

eeuurraallffoollddss // FFuusseess eeuurraallttuubbee 

eeuurraal l ##rroooovvee // --eeccoommees s tthhe e nneeuurrooccooeel l eeuurrooccooeell 'nterior

'nterior neuropore

neuropore // // CClloosseess eeuurraallttuubbee



eeuurraal l ccrreesstt // // FFoorrmms s tthhe e ##aann##lliiaa, , ppii##mmeennt t cceellllss, , ppaarrtt of the #ill arches etc.

of the #ill arches etc.

'bove the neural 'bove the neural tube and ed#es of tube and ed#es of

(2)

the neural plate %rosencephalo

n /

Divides into the telencephalon ('nterior) and diencephalon (posterior)

ith median vesicle and lateral

out pocketin# on each side

$ead

ectoderm !esencephalon ptic vesicle,

optic cup / / / 0etinal portion of the eyes

Close pro1imity to head ectoderm &nfundibulum / / / Forms the posterior lobe of the pituary

#land

Floor of the diecephalon %rosocoel / Give rise to ventricle &2&&& Cavity of

prosencephalon

$ead

ectoderm !esocoel !esencephalo

n / / / 0emains the mesencephalon

%rosencephalo n

0hombencephal on !esocoel / Gives rise to the cerebral a3ueduct %rosocoel !etacoel 0hombenceph

alon /

Divides into the metencephalon ('nterior) and myelencephalon

(posterior)

!esencephalo

n Spinal cord !etencephalo

n / / / Forms the cerebellum

!esencephalo

n, isthumus !yelencephalon !etacoel / -ecomes part of &4 ventricle !esocoel !yelocoel !yelencephalo

n / / /

!etencephalo

n Spinal cord !yelocoel / -ecomes part of &4 ventricle !etacoel Central canal

&sthmus / / %ersists Seperates mid

from hind brain !id brain $ind brain

Diencephalon / / %ersists !esencephalo

n 5elencephalon 4elum

transversum / / %ersists

Dorsal wall of the

forebrain Diencephalon 5elencephalon Semilunar

#an#lion / / %ersists

Close to body and myelencephalon 6u#ular #an#lion / / %ersists Lateral to meyelencephalon , above anterior cardinal vein 'coustico2 facialis #an#lion / / %ersists 'ttached to the otic vesicles and anterior cardinal

veins Lateral to myelencephalon

(3)

#an#lion the myelencephalon vesicles *eart "tructures #4 hr $$ hr 4% hr &#

hr 'ate (ther notes Anterior )osterior

'mnio2cardiac

vesicle / Gives rise to the amnion and heart

%ro1imal wall: thickened splachnic mesoderm Dorsal wall: somatopleure -ulbus arteriosus / / / %ersists Connect ventricle

to ventral aorta 4entral aorta 4entricle +pimyocardiu

m / / /

$eart wall

Gives rise to epicardium ($eart coverin#) and myocardium ($eart

muscles)

Fuses with endocardium to

form the heart wall

&sthmus / / / %ersists Connects heart to

the fore#ut

4entricle / / / %ersists -ulbus

arteriosus 'trium

'trium / / / Forms the auricles 4entricle Sinus venosus

Sinusvenosus / / / %ersists 'trium 4itellineveins

Digestive "tructures #4 hr $$ hr 4% hr &#

Fore#ut / / / / %ersists -eneath the

neural plate %reoral #ut !id#ut

ral plate / / / / -reaks to form openin# of the mouth

&n contact with the 7oor of the fore#ut and ectoderm of the

head Sub#erminal

cavity / Give rise to the mid#ut

-eneath the hypoblast 'nterior

intestinal portal

/ / &ncorporated to the yolk stalk -eneath the fore#ut

!id#ut / / penstotheyolk Fore#ut $ind#ut

Stromodeum / Forms the buccal cavity -eneath the fore#ut

Subcephalic cavity

(4)

pharyn1 by oral plate Laryn#otrache

al #roove / /

Develops into the laryn1, trachea and lun# buds

+sopha#us / / %ersists Dorsaltothe#ut

Liver

diverticulum / /

Forms the liver and other internal or#ans

$as caudal and cranial rudiment

Duodenum / / %ersists Continuous with

the fore#ut

Cranial liver rudiment $ind#ut / / Forms the small intestines and cloaca Continuous with

the mid#ut mid#ut

Caudal intestinal portal Caudal

intestinal portal

/ / disappears pens to the yolk

Caudal intestinal portal 5ail bud E+cretory "tructures #4 hr $$ hr 4% hr &#

ephrotome / /

%ronephros ('nterior) !esonephros and metanephros

(posterior)

-etween somites and lateral plate

mesoderm !esonephric

ducts / / Forms the mesonephric kidneys

Lateral to descendin# aorta !edial to mesonephric tubule rudiment ephostome / / %ersists penin# of the mesonephric tubule to the coelom Coelom !esonephric tubules Blood vessels "tructures #4 hr $$ hr 4% hr &#

Sinus

terminalis / Gives rise to terminal blood vessels

%art of area opaca vasculosa -lood islands / Forms 8rst blood cells and vessels %art of area opaca

vasculosa 'nterior

cardinal veins / / / %ersists

Lateral to the

mesencephalon Cardinal veins Dorsal aorta / / / %ersists Dorsal to pharyn1

Descendin# aorta mphalomesent

(5)

4entralaorta / / / %ersists -elowphayn1

aorticarches / / / %ersists Connects dorsal

to ventral aorta

Carotidloop / / %ersists +1tension of the

9st_{aortic arches}

&nternal carotid

arteries / / %ersists

+1tendin# from the carotid loop alon#side the forebrain !edial to optic cups Dorsal interse#mente d arteries

/ / %ersists -etween spinal

cord and somites Cardinal veins / / Seperates into postcardinal (Dorsal)

and common cardinal (4entra)

Common cardinal attached to sinus venosus (ther structure "tructures #4 hr $$ hr 4% hr &#

'rea opaca

4itellina /

4asculated by the splanchnic mesoderm

Direct contact with the yolk

'rea pellucida / +ctoderm and mesoderm

Directly over the sub#erminal

cavity Consists of outer epiblast and inner

hypoblast

'rea opaca 'rea opaca

%rechordal

plate / Forms the head mesenchyme

-etween fore#ut and neural plate

$ead

mesenchyme otochord otochord / / / / Does not persist -etween fore#ut

and neural plate

%rechordal

plate $ensens node

Coelom / -ecomes the body cavity

&n between the delaminated splanchnic and

somatic mesoderm

$ensens node / / &nva#inate to form notochord otochord %rimitive streak

%rimitivepit / $ensensnode %rimitive#roove

Lens placodes / Forms +ye lens

(6)

duct 5hyroid

rudiment / / / Forms the thyroid #land

4entral diverticulum of

the pharyn1 !andibular arc / / Forms the ;aws -ears 9

st_aortic

arch stromodeum

!a1illary arc / / Forms the ma1illa

n either side of the rathkes

pouch

stomodeum 0athkes

pouch / / Forms the hypophyis

Dorsal to stromodeum 5ransverse septum / / %ersists Connection of the isthmus

5ail bud / / Forms the tail Ceudal end of the