fg_, foregut.
_g^1-5_, gill clefts.
_gf^1-6_, gill folds.
_gl_, glomerulus.
_h_, head-fold.
_gs_, glottis.
_gz_, gizzard.
_hb_, hindbrain.
_hc_, head cavity.
_hg_, hindgut.
_ht_, heart.
_i_, intestine.
_i'_, stomach.
_il_, large intestine.
_in_, infundibulum.
_io_, intromittent organ.
_ir_, iris.
_it_, iter.
_k_, kidney.
_la_, larynx.
_li_, liver.
_lm_, longitudinal muscle layer.
_ln_, lens.
_lp_, _lp'_, etc., loops of intestine.
_lu_, lungs.
_lv_, lens vesicle.
_m_, mouth.
_ma_, manus.
_mb_, midbrain.
_me_, medullary canal.
_me'_, tip end of medullary canal.
_md._, mandibular folds.
_mes_, mesoderm.
_mes'_, myocardium.
_mf_, medullary fold.
_mg_, medullary groove.
_mk_, Meckel's cartilage.
_ml_, muscle layer.
_mp_, muscle plate.
_ms_, mesentery.
_mv_, meatus venosus.
_mx_, maxillary fold.
_myc_, myocoel.
_n_, nasal cavity.
_na_, neural arch of vertebra.
_nc_, neurenteric canal.
_nl_, nervous layer of ectoderm.
_nt_, notochord.
_o_, ear vesicle.
_oc_, optic cup.
_oe_, oesophagus.
_on_, optic nerve.
_os_, optic stalk.
_ov_, optic vesicle.
_p_, pituitary body.
_pa_, posterior appendage.
_pag_, post-anal gut.
_pan_, pancreas.
_pan'_, opening of pancreas.
_pc_, posterior cardinal vein.
_pe_, pes.
_pg_, primitive groove.
_ph_, pharynx.
_pip_, posterior intestinal portal.
_pl_, pelvis.
_pn_, posterior nares.
_pr_, pericardial cavity.
_ps_, primitive streak.
_pt_, pecten.
_py_, pylorus.
_r_, rib.
_rt_, retina.
_s_, somites.
_sc_, spinal cord.
_se_, spenethmoid cartilage.
_sg_, spinal ganglion.
_sl_, submucosa.
_sm_, splanchnic mesoblast.
_sn_, spinal nerve.
_so_, somatic mesoblast.
_st_, stomodaeum.
_sy_, sympathetic nervous system.
_t_, tail.
_ta_, trachea.
_tg_, thyroid gland.
_tn_, tongue.
_to_, tooth anlage.
_tr_, trunchus arteriosus.
_tv_, _tv'_, third ventricle of brain.
_ty_, thymus gland.
_u_, umbilical stalk.
_v'_, _v''_, _v'''_, first, second, and third cerebral vesicles.
_va_, vascular area.
_vc_, vocal cords.
_vm_, vitelline membrane.
_vn_, ventricle of heart.
_vp_, velum palitum.
_vv_, vitelline blood vessels.
_wd_, Wolffian duct.
_wdo_, opening of Wolffian duct.
_wr_, Wolffian ridge.
_wt_, Wolffian tubule.
_x_, point of origin of bronchi.
_y_, yo