ZYGOTE - BLASTULA - GASTRULA
GASTRULATION is a process that establishes three primary germ layers :
1) ECTODERM 2) MESODERM 3) ENDODERM
1)ECTODERM : It is all the superficial stuff ie hair,skin,lens etc.
it has surface ectoderm (outer ectoderm),neural crest, neural tube
a)OUTER ECTODERM or SURFACE ECTODERM : (EPIDERMIS) (mneumonic - M2ISSSON2 - CAL -H)
MOUTH EPITHELIUM,TOOTH ENAMEL,CHEEK EPITHELIUM
ANTERIOR PITUITARY (Ratke's Pouch)
HAIR
LENS
CORNEA
SEBACEOUS GLANDS,SWEAT GLANDS,SALIVARY GLANDS
MAMMARY GLANDS
NAILS
INNER EAR
OLFACTORY EPITHELIUM
NASAL LINING
b) NEURAL CREST : (mneumonic - SA4D2EN-FP)
FACIAL CARTILAGE
AUTONOMIC NERVOUS SYSTEM (SYMPATHETIC AND PARASYMPATHETIC NERVOUS SYSTEM)
ADRENAL MEDULLA
ARACHNOID AND PIA MATER
AORTICOPULMONARY SEPTUM
DENTINE OF TEETH (ODONTOBLASTS)
DORSAL ROOT GANGLIA
NEUROGLIAL CELLS
SCHWANN CELLS
ENDOCARDIAL CUSHIONS
PHARYNGEAL ARCH CARTILAGE
C) NEURAL TUBE :
BRAIN
SPINAL CORD
POSTERIOR PITUITARY
PINEAL GLAND
MOTOR NEURONS
2) ENDODERM : It is all the stuff that is inside ie gut tube derivatives,internal organs except spleen
EPITHELIAL LINING OF RESPIRATORY TRACT
EPITHELIAL LINING OF GIT
EPITHELIAL LINING OF URINARY BLADDER AND URETHRA
EPITHELIAL LINING OF REPRODUCTIVE TRACT
LIVER AND BILIARY TREE
THYMUS AND PARATHYROID GLANDS
3) MESODERM : It has all the stuff in the middle ie in between internal organs and skin
it has notochord,somite,intermediate mesoderm,lateral plate mesoderm
a)NOTOCHORD :
NUCLEUS PULPOSUS OF INTERVERTEBRAL DISCS
b)SOMITE :
SCLEROTOME
VERTEBRAE
RIBS
DERMATOME
DERMIS OF DORSAL BODY REGIONS
MYOTOME (TRUNK AND LIMB MUSCULATURE)
c) INTERMEDIATE MESODERM :
KIDNEYS
GONADS
d)LATERAL PLATE MESODERM :
SOMATIC MESODERM - PARIETAL SEROSA
DERMIS OF VENTRAL BODY
CONNECTIVE TISSUES OF LIMBS
BONES
JOINTS
LIGAMENTS
SPLANCHIC MESODERM - WALL OF DIGESTIVE AND RESPIRATORY TRACTS ( EXCEPT EPITHELIAL LINING)
VISCERAL SEROSA
HEART
BLOOD VESSELS
SPLEEN
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