Carnegie stage 23
Facts: Week 8, 56 - 60 days, 27 - 31 mm
View: Lateral view. Amniotic membrane removed.
Identify: scalp vascular plexus, eylid, eye, nose, auricle of external ear, mouth, sholder, arm, elbow, wrist, toes separated, sole of foot, umbilical cord
This is the last stage of embryonic development and the embryo appears externally to have most human features.
Mesoderm: heart prominence, ossification continues
Head: nose, eye, external acoustic meatus, eyelids, external ears, rounded head
Body: straightening of trunk, heart, liver, umbilical cord, intestines herniated at umbilicus
Limb: upper limbs longer and bent at elbow, hands and feet turned inward, foot with separated digits, wrist, hand with separated digits
Extraembryonic Coelom: chorionic cavity is now lost by fusion with the growing amniotic cavity
Link to next page in Fetal Practical - Early Fetal