Pituitary - Week 5 elongation, contacts infundibulum, diverticulum of diencephalon
Heart - Week 5 septation starts, atrial and ventricular
Respire - Week 5 left and right lung buds push into the pericardioperitoneal canals (primordia of pleural cavity)
Respire - Week 5 to 17 lung histology - pseudoglandular
Hearing - Week 5 cochlear part of otic vesicle elongates (humans 2.5 turns)