HISTO HOME
CRR
Index
Respiratory
Guide

Cardiovascular
Guide

Renal
Guide
RESOURCE CENTER
Lung alveoli

stratum corneumstratum granulosumstratum spinosumcapillaryvenulemelanocyte?stratum basaledermisblood vesselulymphocyte infiltrateblood vesselblood vesselvesselblood vesselvesselnervearteryveinblood vesselblood vesselblood vesselblood vesselfibrous connective tissueadipocyteadipocyteadipose tissuenerveblood vessel

Most of the volume of the lung consists of air-filled space, subdivided into millions of small interconnected chambers by alveolar walls.  The cellular composition of alveolar walls cannot be readily resolved at this magnification.

A small cluster of alveolar macrophages ("dust cells") may be seen near the center of the image

.In this specimen, the shape of the alveoli is somewhat distorted by preparation.  At the entrance to each alveolus, a "knob" along the alveolar wall contains smooth muscle fibers which allow the size of the opening to be adjusted.  Each alveolar wall is lined on either surface by simple squamous epithelium, with capillaries sandwiched in between.


Comments and questions: dgking@siu.edu

SIUC / School of Medicine / Anatomy / David King

http://www.siumed.edu/~dking2/crr/CR017b.htm
Last updated:  30 July 2003 / dgk