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Carnegie Stage Section
T-1 spinal ganglion, arch of aorta, auricle of right atrium, cephalic edge of right ventricle, head of rib 2, humerus, mammary gland, metacarpal 4, musculocutaneous nerve, notochord, pericardial cavity, radial nerve, rib 3, rib 4, rib 5, scapula, serratus anterior muscle, subscapularis muscle, superior vena cava, sympathetic trunk, triceps brachii muscle
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Carnegie Embryo #4090   |   Location: 14-15

Keywords: T-1 spinal ganglion, arch of aorta, auricle of right atrium, cephalic edge of right ventricle, head of rib 2, humerus, mammary gland, metacarpal 4, musculocutaneous nerve, notochord, pericardial cavity, radial nerve, rib 3, rib 4, rib 5, scapula, serratus anterior muscle, subscapularis muscle, superior vena cava, sympathetic trunk, triceps brachii muscle

Source: The Virtual Human Embryo.