File:Human week 10 fetus 09.jpg

Human Female Fetus - Atlas and Axis (10 week)

Large image version of plane D, close to midline (Stain - Haematoxylin Eosin). 0.5 mm scale bar

Axial Skeleton Development

Note the atlas cervical vertebra (C1) and axis cervical vertebra (C2) specialised vertebra of the axial skeleton to connect the skull to the vertebral column. The atlas arch and the axis odontoid process are shown, with the developing transverse ligament. The developing intervertebral disc lies between the axis and C3.

The vertebral column forms from the sclerotome of somites, each somite pair providing half (left/right) of the vertebral body. The skeleton is still cartilage at this stage and will ossify during the fetal period by endochondral ossification.

Neural Development

Behind the vertebral column the junctional region between brainstem (hindbrain) and spinal cord is shown.

• Human Female Fetus (week 10)
• 

  Sagittal Section (plane D)

• 

  Pituitary and Lamina Terminalis

• 

  Olfactory Nerve

• 

  Atlas and Axis

• 

  Sacrum

• 

  Oral Cavity

• 

  Epiglottis

• 

  Heart

• 

  Spleen

• 

  Midgut Herniation

• 

  Midgut Herniation (label)

• 

  Pelvic Region

• 

  Pelvic Region (label)

Related Images

Fetus (week 10) Planes A (most lateral), B (lateral), C (medial) and D (midline) from lateral towards the midline.

• Human Fetus - most lateral | lateral | medial | midline

• Head - most lateral | lateral | medial | midline

• Cerebellum - most lateral | lateral | medial | midline

• Urogenital Unlabelled - most lateral | lateral | medial | midline

• Urogenital Labelled - most lateral | lateral | medial | midline

• Large Images - midline

Image Source: UNSW Embryology, no reproduction without permission.