External features of the 5-mm embryo.
Keywords: cephalic flexure, cervical flexure, cervical sinus, cloacal membrane, coelom, cut edge of amnion, cut edge of umbilical vesicle, eye prominence, left atrial prominence, left umbilical vein prominence, left ventricular prominence, lower limb bud, mandibular prominence of pharyngeal arch 1, mesonephric prominence, olfactory placode area, otic prominence, pharyngeal arch 1 (mandibular process), pharyngeal arch 1 (maxillary process), pharyngeal arch 2, pharyngeal arch 3, pharyngeal arch 4, pharyngeal groove 1, pharyngeal groove 2, rhombencephalic prominence, spinal cord ridge, stomodeum, tail bud, umbilical cord, upper limb bud
Source: Atlas of Human Embryos.