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Carnegie Stages
Stage Days Event
10 8.5 First somites appear, rostral neuropore closes
12 9.5 Rostral limb bud, embryonic pedicle, caudal neuropore closes, one cerebral vesicle, pharyngeal arches, completion of optic vesicle
13 10.5 Dosral C-shaped curvature, caudal limb bud, prominent cardiac swelling, four pharyngeal arches
14 11.5 Three cerebral vesicles, optic plate, mesonephric ridge
15 12.5 Hand plate, wheel ray limbs, lens vesicle closes, five cerebral vesicles, facial buds, vertebrae
16 13.5 Foot plate, finger rays, prominent liver, intestinal loops, auricular hillocks
19 14.5 Cuboidal body, trunk straightens, parallel limbs, toe rays, modeled face, visible auricle
20 15.5 Elbow, fingers elongate, notches between toe rays
21-22 16.5 Toes free, cecal bud in intestinal hernia
22-23 17.5 Knee, neck, eyelids
23 18.5 Hands and feet join at the midline, closure of abdominal wall, eyelids cover eyes
Following this stage fetal appearance is completed, organogenesis is achieved