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Human Embryo Head Region (Week 8, Carnegie Stage 22)

Section through the Week 8 human embryo oral cavity, skull, auditory and neural components. Superimposed measurements of different structures within the stage 22 embryo head. Compare these sizes with those seen in the feral, newborn and adult head.

Oral cavity - midline tongue, unfused palatal shelves.
Skull - temporal bone still present as cartilage template and not yet ossified.
Auditory - external, middle and inner ear components. Note undifferentiated cochlear.
Neural - cranial nerve 8 (CNVIII), brain stem region, ventricular space and choroid plexuses.

temporal cartilage, middle and inner ear and brain stem.

Links: full image cochlea | Inner Ear Development | Carnegie stage 22

Selected Embryo Histology - Week 8 (Stage 22)
Selected Human Embryo Histology - Stage 22 (week 8) developing cortex labeled central nervous system and ventricles central nervous system and ventricles measured image nose and eyes eye optic nerve lens lens and pigmented epithelium lens and pigmented epithelium head region measured developing cochlea pituitary pituitary measured pituitary vertebra and spinal cord mesonephric ducts and bladder developing testis developing testis labeled developing testis developing testis labeled midgut herniation pelvic region - rectum and bladder pelvic region - rectum and bladder labeled pelvic region - rectum pelvic region - rectum labeled Aorta filled with red blood cells Lungs and thymus Dorsal aorta Placental blood vessels
Links: Carnegie stage 22 \| Week 8