HSF/Histology/Look-alikes

From ViridisWiki

Contents 1 GI histology 1.1 Small intestine 1.1.1 Duodenum 1.1.2 Jejunum 1.1.3 Ileum 1.1.4 vs. Large intestine 1.2 Stomach 1.2.1 Cardia 1.2.2 Corpus/fundus 1.2.3 Pylorus 1.3 Appendix 1.3.1 vs. Large intestine 1.3.2 vs. Ileum 2 Reproduction 2.1 Efferent ductules 2.1.1 vs. Seminiferous tubules 2.1.2 vs. Epididymis

GI histology

Small intestine

In general:

• Villi
• Crypts of Leiberkuhn
• Paneth cells

Duodenum

• Brunner's glands in submucosa
• Plicae circularis

Jejunum

• Plicae circularis
• Long vasa recta
• Few arcades

Ileum

• Unapparent plicae circularis
• Short vasa recta
• Numerous arcades

vs. Large intestine

• Small intestine has crypts and villi, large intestine has crypts but no villi
• Small intestine has few mucous cells, large intestine has many

Stomach

Cardia

• Shallow gastric pits
• Few parietal and chief cells

Corpus/fundus

• Deep gastric pits
• Numerous parietal and chief cells

Pylorus

• Convoluted gastric glands → numerous glands seen in cross section
• Height of glandular portion = depth of gastric pits

Appendix

vs. Large intestine

• Both have crypts but no villi
• Appendix has smaller lumen
• Appendix has more lymphatic tissue

vs. Ileum

• Both have abundant lymphatic tissue
• Appendix has crypts but no villi, ileum has crypts and villi

Reproduction

Efferent ductules

vs. Seminiferous tubules

• Scalloped epithelial lining (due to varied cuboidal, pseudostratified ciliated epithelium)
• Outside the tunica albuginea

vs. Epididymis

• Epididymis has smooth apical lining
• Pseudostratified columnar, stereocilia