Encyclopedia: Sphincter Ani Externus Muscle
The Sphincter ani externus is a flat plane of muscular fibers, elliptical in shape and intimately adherent to the integument surrounding the margin of the anus. It measures about 8 to 10 cm in length, from its anterior to its posterior extremity, and is about 2.5 cm broad opposite the anus. It consists of two strata, superficial and deep. , The superficial, constituting the main portion of the muscle, arises...
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Fetal Ultrasound
An ultrasound can give you an early glimpse of your developing baby. Learn about it here:
Ultrasounds are performed throughout pregnancy to assess the development of the baby. Take a look at what doctors look for when viewing a fetal ultrasound - the heart, spine, legs, brain, and more. This slide show from the Mayo Clinic contains real ultrasound images.
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