File:Fetal head section 01.jpg

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Human Fetal Head Week 12

Selected medial head (12 weeks) view showing key features of head musculoskeletal and neurological development. Note extensive nasal cartilage, nasal conchae, pituitary, secondary palate, oral cavity, tongue, mandible, hyoid, choana, oropharynx. Also note the developing tongue musculature and its mandibular attachment site.


12 Week Images: Sagittal unlabeled | Sagittal labeled | Sagittal medial view | Sagittal lateral view | Pituitary unlabeled | Pituitary labeled | Tongue | Skull Development | Head Development


This mid-line section through the fetal head shows features of the developing skull and the brain, face and mouth.

Neural

  • brain - hypothalamus and pituitary
  • brainstem - pons and medulla
  • lamina terminalis - site of anterior neuropore closure
  • ventricular space - fourth ventricle

Endocrine

  • hypothalamus
  • pituitary
    • sitting in the cartilage form of sella turcica
    • note remnant of Rathke's pouch still visible on floor of developing sella turcica

Musculoskeletal

cartilage

  • nasal septum - midline of developing nasal cavities
  • chrondrocranium - base of skull
  • tracheal cartilages - surrounding trachea

bone

  • ossifying nasal concha
  • hard palate - roof of mouth
  • mandible
  • vertebra, axis and atlas

muscle

  • soft palate - back of mouth
  • tongue - foramen cecum
  • genioglossus muscle - attached to mandible
  • geniohyoideus muscle - attaching hyoid bone to mandible


Image Source: Prof Virginia Diewert


Cite this page: Hill, M.A. (2020, October 25) Embryology Fetal head section 01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Fetal_head_section_01.jpg

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© Dr Mark Hill 2020, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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current14:07, 18 March 2012Thumbnail for version as of 14:07, 18 March 20121,200 × 821 (186 KB)Z8600021 (talk | contribs)
13:23, 18 March 2012Thumbnail for version as of 13:23, 18 March 20121,200 × 821 (185 KB)Z8600021 (talk | contribs)
13:17, 18 March 2012Thumbnail for version as of 13:17, 18 March 2012965 × 660 (120 KB)Z8600021 (talk | contribs)
12:11, 18 March 2012Thumbnail for version as of 12:11, 18 March 2012965 × 660 (118 KB)Z8600021 (talk | contribs)==Human Fetal Head Week 12== Selected medial head (12 weeks) view showing key features of head musculoskeletal and neurological development. Note extensive nasal cartilage, nasal conchae, pituitary, secondary palate, oral cavity, tongue, mandible, hyoid,