Template:Shumway1935 table2
From Embryology
| (Synonyms in parentheses) |
| Anterior (cephalic, cranial, rostral) — head end. |
| Posterior (caudal) — tail end. |
| Dorsal — back side. |
| Ventral — belly side. |
| Lateral — either right (dextral) side, or left (sinistral) side. |
| Mesial (median, medial) — middle. |
| Proximal — nearer the point of reference. |
| Distal — further from the point of reference. |
| Transverse (horizontal) — a plane intersecting the antero-posterior axis at right angles, dividing anterior portion from posterior. |
| Sagittal — the mesial plane of the body or any plane parallel to it, dividing right portion from left. |
| Frontal (coronal) — any plane at right angles to both transverse and mesial planes dividing dorsal portion from ventral. |
| Primordium (anlage, Germ.; ébauche, Fr.) — the first recognizable stage in the development of any new part of the embryo. |
| Invagination — the growth of a surface in (toward the point of reference). |
| Evagination — the growth of a surface out (away from the point of reference). |
