Lab 20 Small & Large Intestines: 1) Index 2) Things to Identify 3) Duodenum 4)Jejunum 5) Ileum 6) Appendix 7) Colon 8) Rectum 9) Rectal Anal Junction 10) Anus 11)Comparison of Structures 12)Practical

 

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

So where are these images from? Fig. 1 has fold all over that look like Villi so it has to be from the small intestines. Now, the submucosa does Not have any glands, and there is no lymphoid tissue present. This cancels out the duodenum and the ilium respectively. So Fig. 1 must be from the jejunum.

Fig. 2 This image has Villi so again it must be from the small intestines. Glands in the submucosa stick out at me, and the only small intestine that has glands in the submucosa is the duodenum, so than Fig. 2 is from the Duodenum.

Fig. 3 This image does not have any Villi present, and the surface is very flat, so this must be from the large intestine. Now we have two choices, colon or rectum. Because of the presence of the many "circular profiles" we can safely assume that Fig. 3 is taken from the Colon. (A good way to remember the circular profile come from the colon is that Colon and Circular both start with the letter C.)

Fig. 4 This image does have Villi present. The first thing that sticks out about it besides the villi, is the secondary nodule and other diffuse lymphoid tissue in the submucosa. The only place you find such tissue is in Peyer's Patches of the Ilium, so there for, Fig. 4 is from the Ilium.

Fig. 5 This image contains no villi, so we know it is from the large intestines. Here we see very Strait and Parallel crypts of Lieberkuhn so this must be taken from the Rectum.