Virtual Lab

Digestive System

-	Plate	Figure	Slide	Comments
A. Oral Cavity
1. Lips	71	1-6	66	Lip, human; H&E. The lips are composed of striated muscle covered on the outside by skin and on the inside by the mucous membrane of the mouth. The skin portion consists of stratified squamous epithelium which is cornified at the surface and which rests on a layer of connective tissue containing sweat glands, hair follicles and sebaceous glands. In the transition region between the skin and the oral mucosa the hair follicles and glands disappear and the epithelium becomes penetrated by tall papillae of connective tissue. It is the blood vessels of these papillae that give the lips their red color. On the oral surface the papillae become shorter and the cornifying (keratinizing) epithelium gives way to a mucosa, consisting of a nonkeratinizing stratified squamous epithelium, supported by a layer of connective tissue, called the tunica propria (lamina propria). The latter blends in with the areolar connective tissue of the underlying submucosa, in which are found the seromucous labial glands.
2. Tongue	64	1,2	69 71	Tongue, human; H&E. Identify the filiform papillae.
	65	1	68 69	Tongue, rabbit; iron hematoxylin. Note the striated muscle and foliate papillae.
	65	2	70	Tongue, circumvallate papillae; H&E.
3. Soft palate	69	1-3	67	Soft palate, vert. sect; H&E.
4. Salivary glands	66	1,2	73 74 supp.	Submaxillary (submandibular) gland; Iron Hematoxylin and Aniline Blue or H&E.
	68	1,2	72	Sublingual gland; Iron Hematoxylin and Eosin.
	67	1,2	75	Parotid gland; H&E.
5. Teeth	70	1-4	16	Membrane bone formation. Rat embryo head, frontal skeleton; Mallory's Triple Stain.

-	Plate	Figure	Slide	Comments
B. Esophagus
1. Upper	72	1,2	77 supp. supp.	Esophagus, upper; H&E.
2. Middle	72	1,2	78	Esophagus, middle; H&E.
3. Lower	73	1	79	Esophagus and Stomach; H&E.
C. Stomach
1. Cardiac region	73	1-4	79	Esophagus and Stomach; Stomach, cardiac; H&E.
2. Fundic region	74,75	all	80 81 83	Stomach, cardiac; stomach, fundus; H&E.
3. Pyloric region	76	1-3	82 83 84 85	All H&E.
4. Muscularis externa and Auerbach's plexus	-	-	supp.	Plastic section; H&E.
-	Plate	Figure	Slide	Comments
D. Small Intestine
1. Duodenum	76	1-3	85	Stomach and duodenum; H&E.
1. Duodenum	77	1,2	86 87 99	Duodenum; H&E.
2. Jejunum	78	1-3	88 89	Jejunum; H&E.
3. Ileum	79	1-3	90 137 supp. supp.	Ileum; H&E.
E. Large Intestine
1. Appendix	81	1,2	91	Appendix; H&E.
2. Colon	80	1-4	92a 92b	Colon, mammal; H&E.
2. Colon			93	Colon, human; H&E.
3. Anorectal junction	82	1-3	94	Anal canal, monkey; H&E

-	Plate	Figure	Slide	Comments
F. Liver	83,84	1,2	95	Liver, pig; azocarmine and aniline blue. The connective tissue septa, which are stained blue, clearly delineate the lobules with a central vein in the center and portal canals at the "corners."
	-	-	97a 97b	Liver, bile canaliculi; silver stained. The silver deposits reveal the location of the bile capillaries (canaliculi) between the hepatocytes. Compare with slide 95 which is stained with H&E.
	-	-	96a 96b	Liver, phagocytosis; H&E and carbon. To prepare this slide, livers were injected with carbon particles in vivo prior to fixation. The sections were then later stained with H&E.
	-	-	132	Liver, Human; H&E. Connective tissue septa are absent, but the lobules can still be delineated.
	-	-	supp.	Liver; H&E; plastic section
G. Gall Bladder	86	1-4	98	Gall bladder; H&E.
H. Pancreas	87	1,2	99a 99b 100	Pancreas; H&E.
	-	-	101	Pancreas; Iron Hematoxylin.
	-	-	102	Pancreas; Golgi silver stain; H&E.
	-	-	103	Pancreas; Iron Hematoxylin and eosin.
			104	Pancreas; injected to reveal vasculature.
	-	-	supp.	Pancreas; plastic section.

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