2011 Lab 10

Endocrine and Integumentary

Endocrine

Developing Pituitary - Human Embryo Carnegie stage 22

• Begin by working through Endocrine Development by week 8.
• Then look at the information on each endocrine organ on their information page.

Integumentary

Teeth

Fetal Head (12 weeks) lateral

Deciduous teeth

Permanent teeth

• integumentary system specialization by epitheilal/mesenchymal interactions in development and develops with a major contribution from the neural crest.
  • ectoderm of the first pharyngeal arch and neural crest, ectomesenchymal cells.
• week 6 - odontogenesis begins, tooth bud
• 4 morphological stages describing the early tooth development: bud, cap, bell, and terminal differentiation
• 2 sets of teeth: 20 deciduous teeth, 32 permanent teeth
• differential rates of growth, shed at different times over 20 year period
• ectoderm, mesoderm and neural crest mesenchyme contribute
• inductive influence of neural crest with overlying ectoderm
• tooth growth occurs in ossifying jaws

odontoblasts

• neural crest-derived mesenchymal cells which differentiate under the influence of the enamel epithelium. Cells secrete predentin, calcifies to form dentin.

ameloblasts

• inner enamel epithelium forms pre-ameloblasts differentiate and produce enamel

periodontal ligament

• tooth is not anchored directly onto its bony socket (alveolar bone) but held in place by the periodontal ligament (PDL), a specialized connective tissue structure that surrounds the tooth root coating of cementum.
• ligament also act as; a shock absorber, transmitter of chewing forces (from tooth to bone), sensory information (heat, cold, pressure and pain).
  • collagen fiber bundles within the ligament are called "Sharpey's fibres".

Teeth Postnatal

Deciduous teeth

• 6 - 24 months - erupt from gums by pushing toward surface
• 2 years - all deciduous teeth present

Permanent teeth

• 6 years until early adult
• tooth bud lie in gums beneath deciduous teeth
• osteoclasts resorb deciduous teeth roots
• growth affects face shape

Links: Tooth Development

SOMS Summer Research Awards

• The Research Support Committee is pleased to announce that it will again be offering Summer Research Awards (SRAs).
• These awards are for undergraduate students carrying out supervised research in SOMS between November 2011 and February 2012.
• Successful students will receive $250 per week for 6 weeks of research. More Information?

Co-ordinator Note

Dr Mark Hill

ANAT2341 Embryology S2 2011 Lecture content is made available on the Monday of the associated lecture week. Some guest lecturers will provide additional handouts or lecture notes. For background information see Embryonic Development and Systems Notes 2011 Timetable | 2011 Students --Mark Hill 06:47, 20 July 2011 (EST)

Course Content 2011

2011 Timetable: | Embryology Introduction | Fertilization | Cell Division/Fertilization | Week 1 and 2 Development | Week 3 Development | Week 1 to 3 | Mesoderm Development | Ectoderm, Early Neural, Neural Crest | Trilaminar Embryo to Early Embryo | Early Vascular Development | Placenta | Vascular and Placenta | Endoderm, Early Gastrointestinal | Respiratory Development | Endoderm and Respiratory | Head Development | Neural Crest Development | Head and Neural Crest | Musculoskeletal Development | Limb Development | Musculoskeletal | Renal Development | Genital | Kidney and Genital | Sensory | Stem Cells | Stem Cells | Endocrine Development | Endocrine | Heart | Integumentary Development | Heart and Integumentary | Fetal | Birth and Revision | Fetal

Glossary Links

Glossary: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Term Link

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Cite this page: Hill, M.A. (2024, May 19) Embryology 2011 Lab 10. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/2011_Lab_10

What Links Here?

© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G