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Fetal Organ System Development

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2-3 Weeks

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Terms in this set (16)

neural tube forms
Tubular heart begins to form
Liver begins to function
Kidney formation begins
Nasal Pits
Thyroid tissue
Optic cup and lens, pigment in eyes

Neural tube closes to form brain and spinal cord
Noticeable limb buds
Tubular heart beats at 28 days
Mouth forms
Stomach, esophagus, and intestine become tubes
Ducts of pancreas and liver forming

Brain is differentiated and cranial nerves
Developing muscles have innervated
Atrial division has occurred

Bone rudiments present
Chambers in heart are present
Oral and nasal cavities and upper lip formed
Liver begins to form red blood cells
Trachea bronchi, and lung buds present
Formation of ears
Embryonic sex glands appear

Fetal heartbeats can be detected
Tongue separates and palate folds
Stomach attains final form
Separation of bladder and rectum
Diaphragm separates cavities
Optic nerve formed
Sexual differentiation begins

Digits formed
Development of heart essentially complete
Heartbeat can be heard at 8-12 weeks
Ears assuming final forms
Genitals in males and females appear similar to end of 9th week

Nail growth begins
Separation of lips
Intestines closed in abdomen
Bladder sac formed
Islets of Langerhans
Eyelids fuse closed
Males produce testosterone

Clear outlines of bones
Completion of Palate
Liver is major producer of RBC's
Lungs acquire shape
Skin is pink and delicate

200grams
Teeth begin to form
Hard and soft palate differentiate
Intestines begin to collect meconium
Kidneys assume shape and organization
Eyes ears and nose are formed
Sex determination possible

Teeth begin forming enamel and dentin
Fetal heart tones audible at 16-20 weeks

435 grams
Myelination begins in spinal cord
Teeth still forming
Actively sucks and swallows amniotic fluid
Lanugo covers body, brown fat begins to form
Detectable level of anti-bodies
Iron is stored in bone marrow

780 grams
Brain looks mature
Respiratory movements may occur
Nostrils reopen and surfactant production begins

1200 grams
Begins regulation of some body fx
Adipose tissue accumulates rapidly
Eye lids open
Testes descend

2000 grams
More reflexes present

2500 grams
Pale body rounded, lanugo disappearing
Ear lobes soft with cartilage
Further development of sexual organs