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Writer's pictureShruti Vedala

HY Question of the day : EMBRYOLOGIC DERIVATIVES


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


EMBRYOLOGIC DERIVATIVES OF GERM LAYERS




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