![](/drem/stage21/labels/S223L.gif)
![T-2 spinal ganglion, T-2 spinal nerve, apex of right lung, auricle of left atrium, auricle of right atrium, left vagus nerve (CN X), metacarpal 4, neural arch, pleural cavity, pulmonary semilunar valve, pulmonary trunk, radial nerve, radius, rib 2, right ventricle, serratus anterior muscle, superior vena cava, ulna](/drem/stage21/Z0/S223N.jpg)
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Carnegie Embryo #4090 | Location: 14-19
Keywords: T-2 spinal ganglion, T-2 spinal nerve, apex of right lung, auricle of left atrium, auricle of right atrium, left vagus nerve (CN X), metacarpal 4, neural arch, pleural cavity, pulmonary semilunar valve, pulmonary trunk, radial nerve, radius, rib 2, right ventricle, serratus anterior muscle, superior vena cava, ulna
Source: The Virtual Human Embryo.