3 research outputs found
A Human Embryo of Streeter Age Group XVIII
A human embryo was serially sectioned and was
reconstructed with the 634 sections.
The presumptive length of the embryo was 14mm.
This embryo was characterized by the heavy pigmentation
of retina, loss of lens vesicle, three semicircular
ducts and still L-shaped cochlea at the inner ear,
formation of the vomeronasal organ, recognition of
nasolacrimal duct , secondary branches from the stem
bronchi in the lung , separation of right and left
ventricles but the absence of septum membranaceum,
and the formation of the Mullerian duct
From above findings , we concluded that this embryo
belonged to the early stage of age group XVIII of
Streeters developmental horizo