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10 Weeks Post Ovulation - Second Trimester
Basic Brain Structure In Place


SIZE: The crown-to-rump length of the growing fetus is about 1.25 to 1.68 inches (31 to 42mm).

TIME PERIOD: 61- 68 days post-ovulation

Head and Neck
Basic brain structure of the fetus is complete and now the brain mass rapidly increases. Sockets for all twenty teeth are formed in the gum lines. Face has human appearance - one example is the nasolacrimal grooveforming on the upper lip. Separate folds of the mouth fuse together forming the palate. Early facial hair follicles begin to develop.

Vocal cords form in larynx and fetus can make sounds.

Intestines have migrated into abdomen from the umbilical cord. Digestive tract muscles are functional and practice contraction. Nutrient-extracting villi line the now folded intestines. The liver starts to secrete bile, a thick, brown-green liquid containing bile salts, bile pigments, cholesterol and inorganic salts. The bile is stored in the gall bladder. Development of thyroid and pancreas are complete. Pancreas starts to produce insulin.

Genitalia begin to show female characteristics (labium minus, urogenital groove, labium majoris) and male characteristics (glans penis, urethral groove, scrotum). Neither male nor female genitalia are fully formed.

Fingernails begin to grow from nail beds.

Fetus develops reflexes and the skin is very sensitive.




From 12–23 weeks, the brain has a smooth surface, with two or three layers differentiated in the cerebral cortex.

At 23 weeks and earlier, the cerebral ventricles are large, afterwhich they gradually become smaller. The subarachnoid space overlying the cortical convexities are slightly dilated at all gestational ages, but most at 21–26 weeks.

During the last 3 months, connections between neurones will amass while growing longer and thicker.

Based on "Normal Fetal Brain Development: MR Imaging with a Half-Fourier Rapid Acquisition with Relaxation Enhancement Sequence"; Li Mei Lan, MD, Yasuyuki Yamashita, MD, Yi Tang, MD, Takeshi Sugahara, MD, Mutsumasa Takahashi, MD, Takashi Ohba, MD and Hitoshi Okamura, MD
ginal work, are licensed under a

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