embryology lab practical 2

• surrounds embryo buffering it from jarring
• somatopleure layer from epidermal ectoderm and somatic lateral plate mesoderm

egg white, 88% water and glycoproteins

• membrane layer that forms hindgut, stores nitrogen
• fuses with chorion to form chorioallantoic membrane
• formed from splanchnopleure a layer from endoderm and splanchnic lateral plate mesoderm

• opening between closed foregut and open midgut
• right below heart region

opening at anterior end of brain

extraembryonic region still connected to underlying yolk

• inner extraembryonic region, separated from yolk by sub-germinal layer.
• area is lighter and translucent

inner region of area opaca where blood islands form

outer region of area opaca where cells contain many yolk granules

• beginning of blood vessel formation in area vasculosa
• formed from splanchnic lateral plate mesoderm

• fused chorion and allantoic membrane
• major function in gas exchange/resperiation

• lies outside amnion and protects embryo
• fuses with allantoic membrane
• forms from somatopleure

region of heart that receives blood from ventricle and delivers blood to ventral aortae.

• type of gastrulation in which blastoderm separates into two layers
• upper epiblast
• lower hypoblast

• follows delamination and is upper layer
• contains ectoderm, mesoderm, and some endoderm

amnion, chorion, yolk sac, and allontios

anterior gut closed into a tube

undercutting fold of blastoderm in area pellucida of head region

top of primitive streak where notochordal cells are ingressing and migrating forward

• follows delamination and is lower layer
• contains extraembryonic endoderm

region of gut between foregut and hindgut

start at crest of neural tube and migrate to become many strucutres many in the face region

• line along which embryonic endoderm and mesoderm cells ingress
• like blastopore

• region of area pellucida in front of embryo's head that is clear
• consist of ectoderm and endoderm
• mesoderm has not reached yet

blocks of mesoderm that becomes subdivided into sclerotome, myotome, and dermatome

forms vertebrae and ribs

forms skeletal muscle for back and appendages

forms the dermis

region of somitic mesoderm that has not yet formed blocks

forms splanchnopleure a layer of endoderm and splanchnic lateral plate mesoderm

• cerebrum part of forebrain
• intelligence and sense of smell

• body cavity in which gut is suspended
• lined by mesoderm

• region of forebrain behind telencephalon
• forms optic vesicles

• is the forebrain
• anterior most region of brain
• contains telencephalon and diencephalon

• posterior most region of brain (hindbrain)
• contains metencephalon and myelencephalon

• medulla oblongata
• sets of motor neurons
• posterior most region

• forms cerebellum
• connects cerebrum and cerebellum

• the midbrain
• processing data from eyes and ears

• found in myelencephalon
• each becomes different motor and sensory nerve

• posterior end of embryo where germ layers come together
• form notochord

form kidneys and gonads

• layer of lateral plate mesoderm lining the coelom
• meets with epidermal ectoderm to form the somatopleure

layer formed by the splanchnic lateral plate mesoderm and endoderm, forms gut wall, yolk sac, and allantois.

• evagination of diencephalon
• form optic cup

region of heart that receives blood from atrium and delivers to conus arteriosus

vein comgin from extaembryonic region and enters posterior chamber of heart