Features: midbrain, nasal placode, lens pit, 1,2,3 pharyngeal arches, fourth ventricle of brain, 1st pharyngeal groove, heart prominence, cervical sinus, upper limb bud, mesonephric ridge, lower limb bud, umbilical cord
Limbs: upper limb nerves (C5-T1) united to form nascent brachial plexus. Shinohara H, Naora H, Hashimoto R, Hatta T, Tanaka O. Development of the innervation pattern in the upper limb of staged human embryos. Acta Anat (Basel). 1990;138(3):265-9.
upper limb bud myoblasts loosely scattered in ventral proximal region and had a small amount of cytoplasm with a few intracellular organelles. Tanaka O, Shinohara H, Oguni M, Yoshioka T. Ultrastructure of developing muscle in the upper limbs of the human embryo and fetus. Anat Rec. 1995 Mar;241(3):417-24.
Notochord: microfibrils and deposition of acid mucopolysaccharides appeared in the notochordal sheath. Shinohara H, Tanaka O. Development of the notochord in human embryos: ultrastructural, histochemical, and immunohistochemical studies. Anat Rec. 1988 Feb;220(2):171-8.
Heart: outflow tract circular and lined by a layer of cardiac jelly. Yu IT, Hutchins GM. Truncus arteriosus malformation: a developmental arrest at Carnegie stage 14. Teratology. 1996 Jan;53(1):31-7.
The Kyoto Collection images are reproduced with the permission of Prof. Kohei Shiota for tutorial/revision purposes and cannot be reproduced electronically or in writing without permission.