Roslyn Watts Southern Biological
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1 Roslyn Watts Southern Biological
2 Why Dissect Rats? Common research animal. Easy to breed. Large litters. Easy care. Placental Mammal like us. Similar internal organs & systems. Hands on practical study. Can t use Primates.
3 What is Perfect Solution? A trade secret! Perfect Solution specimens are the new, safe alternative to frozen or fresh specimens.
4 Perfect Solution is.. Not smelly like formaldehyde. It has an odour but less offensive to most people. Not toxic, with easy disposal. Safe to handle. See MSDS Inexpensive. Costs the same as a frozen rat.
5 Classroom: Bottom Line If formalin smell has put you off before, then these rats may better suit your requirements. More readily available than frozen/fresh rats. Tissue is a better colour, more flexible and softer to dissect. Dissection can go over a number of days.
6 Dissection Time! Our focus: major organs of the abdominal and thoracic cavities Other possible approaches: Musculoskeletal system Reproduction (using pregnant rats) Focus on any organ system
7 External examination Hair Teeth Feet Eyes Tail Whiskers Genitals
8 External examination Hair. Compare a rat s features with the more-familiar features of a human Body Hair Rats have normal hair distribution. Why are humans so bald?
9 External Examination Whiskers: Rats: Major sensory organ allows for feeling close things in the dark & finding way home. Thicker and stiffer than any other hairs. Specialized hair follicles detect deflections Humans: no whiskers Not as active in the dark as rats Use our hands to feel
10 External Examination Teeth Rats: 16 teeth in all. Open-rooted. made for gnawing (front) and chewing (back) incisors grow approx cm each year. No canines or premolars. Lower jaw is not joined in the centre like the human jaw. Humans: 32 teeth in total. use our hands and tools to get through tough things no need for gnawing teeth
11 External Examination Feet Rats: Claws allow for good grip/traction climbing. Paws Scent trails. Front paws also good for manipulating objects (quite humanlike) Humans: front feet entirely transformed into manipulative tools no longer for locomotion. back feet entirely adapted for walking on the ground no longer good at climbing or manipulating
12 External Examination Eyes Rats: Eyes point outward. Wide range of vision. Relatively poor vision. Poor colour vision. Light, Shadow & Movement. Humans: Eyes point forward. Good depth-perception and colour vision.
13 External Examination Genitals (if students are mature enough): Rats: very large testicles (relative to body size) Humans: comparatively small testicles Sperm competition rats more promiscuous than humans? Nipples Humans: 2 Rats: lots!
14 External Examination Tail Rats balance aid temperature regulator (why no hair?) Humans: None millions of years gone!
15 Cut through skin
16 Incisions Secure with rubber bands Scissors are the best tool prevents accidentally cutting things underneath Start by pulling up skin and then snipping just skin! Careful not to get muscle as well Extend cuts with scissors Peel skin back. Examine muscles Pectoralis major easily visible Appeals to boys that have recently discovered the bench press Abdominal muscles form a soft wall Very thin and almost translucent
17 Cut through muscle Similar procedure to skin Only cutting up to the rib cage
18 Examine abdominal cavity Liver Small intestine Caecum
19 Remove Abdominal Organs Carefully snip connective tissue Try to not damage diaphragm Try to keep digestive tract intact
20 Open Thoracic Cavity Snip through rib cage and pull sides back Might take a bit of force don t worry if you hear a few cracks in the process.
21 Examine thoracic cavity Lungs Heart Diaphragm
22 Other things to do Dissect individual organs Expose trachea Investigate other systems: Reproductive Muscular Nervous including brain! Endocrine
23 Hero Rats
24 Hero Rats African Giant Pouched Rat. Cheap. Easy to train. Use in any terrain. Relatively long life span for a rat of 6 8 years.
25 Hero Rats Detect Mines trained on TNT in Africa & Cambodia. Detect Tuberculosis trained on positive sample. Lab Tech 40 samples per day using microscopy evaluation Hero Rat 40 samples in seven minutes!
26 Hero Rats This second-line screening increased new TB case detection rates in some of the African hospitals by 43%!
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