Table 2. Measurements of the muscularis thickness in virgin, parous and pregnant sheep.

Tissue		Muscularis thickness, (µm ± SEM)		Total muscularis (% of total wall thickness1 ± SEM )
		Min2	Max2
Virgin	Anterior	1359±144	1970±149	50.5±6.2*
	Posterior	1037±271	2201±439	45.0±9.3**
Parous	Anterior	2047±356	3325±598	65.1±8.1
	Posterior	1537±311	2747±146	50.7±6.9**
Pregnant	Anterior	1983±377	2440±486	71.1±5.9*
	Posterior	2436±193	3428±596	76.5±5.5**

¹Total thickness was measured from the surface, including the epithelium, to the serosal border.

²numerous measurements (>20) were taken to establish minimum and maximum values for each slide.

p<0.05 (*pregnant anterior compared to virgin anterior; **pregnant posterior compared to virgin posterior and to parous posterior).