1 / 12

What is/are the function(s) of the digestive system ? What structures are necessary ?

Introduction to Digestive System. What is/are the function(s) of the digestive system ? What structures are necessary ? How does function vary with form ?. Introduction to Digestive System. How are we similar to a tall donut ?. Graphic overview of aliment ary canal.

carl
Download Presentation

What is/are the function(s) of the digestive system ? What structures are necessary ?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction to Digestive System What is/are the function(s) of the digestive system? What structures are necessary? How does function varywith form?

  2. Introduction to Digestive System How are we similar to a tall donut? Graphic overview of alimentary canal

  3. Introduction to Digestive System How does this system develop embryologically? Endoderm is the epithelial lining of the alimentary canal. Mesoderm splits into somaticand splanchnicmesoderm. Splanchnic mesoderm contributes to substance of G.I. Viscera (visceral and parietal peritoneum). Yolk or membrane connection is the midgut Anterior = foregut and posterior = hindgut.

  4. Oral Cavity What are features of the mouth and oral cavity? Oropharyngeal cavity in jawed fishes Oral cavity in tetrapod What comprises the cavity?Laterally… the cheeks (mucousa, buccinator, hypodermis, dermis, and epidermis) Superiorly… the palate (primary and secondary)

  5. Oral Cavity What are features of the mouth and oral cavity? Reptiles have palatal fissure, this channels air from internal naresto pharynx. Anurans can have openings that lead to evaginations of the oral cavity (vocal sacs) extending below the phayrnx. Seed eating birds can have a similar evagination (seed pouch) suspended by the mylohyoid. Granivorous mammals can have cheek pouches http://content.answers.com/main/content/wp/en/thumb/7/7d/240px-Litoria_chloris_calling.jpg http://www.birdandhike.com/Wildlife/Mamm/06Rod/04_Het/Dip_mer/D_mer.htm

  6. Oral Cavity What can your palate do for you? Hard and Soft palates Cleft lip/palate:congenital defect where embryonic tissues fail to fuse

  7. Tongue

  8. Tongue

  9. Tongue

  10. Tongue What are the functions of the tongue? Assist in forming a bolus Facilitate taste Used to capture food Used to thermoregulate Cleaning body (fur, eyelids etc.) Bound by the frenulum Receptors for stereognosis

  11. Oral Glands What are the functions of the oral glands of tetrapods? Assist in forming a bolus Facilitate taste Can make tongue sticky Can produce toxins (palatal in 4 snake groups, sublingual in lizard) Initiate digestion (amylase/ptyalin) Aid in immunity (lysozyme) Goblet cells in fish… papa catfishes

  12. Oral Glands How do you salivate? 3 paired glands:ParotidSubmandibularSublingual Scattered small tubular glands Secrete mucus, serous fluid and enzymes Endocrine or Exocrine?

More Related