Medical Gross Anatomy
Anatomy Tables - Topographical Anatomy
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Medical Gross Anatomy |
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Topographical Anatomy of the Pelvis & Perineum - Listed Alphabetically |
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| Structure/Space | Description/Boundaries | Significance |
| anal triangle | posterior subdivision of the diamond-shaped perineum; its boundaries are: anteriorly - posterior margin of the perineal membrane (corresponds to an imaginary line connecting the ischial tuberosities); posterolaterally - sacrotuberous ligament | anal triangle is the location of the terminal end of the gastrointestinal tract (anus) |
| ischioanal fossa | a fat-filled space located lateral to the anal canal and inferior to the pelvic diaphragm; its boundaries are: superomedially - pelvic diaphragm (anterior recess extends superior to the urogenital diaphragm); medially - external anal sphincter muscle and anal canal; laterally - obturator internus fascia and ischial tuberosity; posterolaterally - sacrotuberous ligament and gluteus maximus m.; (posterior recess extends superior to the gluteus maximus m.) | the fat and loose connective tissue in the ischioanal fossa compresses to allow passage of feces; also known as: ischiorectal fossa |
| natal cleft | midline cleft between the buttocks | natal cleft lies between the gluteus maximus muscles |
| perineum | a diamond-shaped space forming the outlet of the pelvis; its boundaries are: anterolaterally - inferior pubic ramus, ischial ramus and ischial tuberosity; posterolaterally - sacrotuberous ligament | perineum is subdivided into the anal triangle and urogenital triangle by an imaginary line connecting the ischial tuberosities |
| urogenital triangle | anterior subdivision of the diamond-shaped perineum; its boundaries are: anterolaterally - inferior pubic ramus, ischial ramus; posteriorly - posterior margin of perineal membrane (corresponds to an imaginary line connecting the ischial tuberosities) | urogenital triangle is the location of the terminal portion of the urinary tract and genital tract |
| The material presented in these tables is
contained in the book: MedCharts Anatomy by Thomas R. Gest & Jaye Schlesinger Published by ILOC, Inc., New York Copyright © 1995, unauthorized use prohibited. |
The excellent editorial assistance of Dr. Pat Tank, UAMS is gratefully acknowledged. |
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| Copyright© 2000 The University of Michigan. Unauthorized use prohibited. |
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