Musculus pyramidalis
Der Musculus pyramidalis (Pyramidenmuskel) wird ebenso wie der M. rectus abdominis (gerader Bauchmuskel) zu den vorderen Bauchmuskeln gezählt.
Die Mm. pyramidalis beider Seiten bilden gemeinsam die Fläche einer Pyramide. Allerdings fehlt dieser Muskel bei 10-25% der Menschen.
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:watermark(/images/logo_url.png,-10,-10,0):format(jpeg)/images/anatomy_term/pyramidalis-muscle-2/S10zZ7Au8Uq3uNYMfB3Yg_pyramidalis_muscle.png "Pyramidenmuskel (Musculus pyramidalis)"){kind=logo}
| Ursprung | Os pubis |
| Ansatz | Linea alba |
| Innervation | Nn. subcostalis und iliohypogastricus |
| Funktion | Spannung der Linea alba |
Verlauf und Versorgung
:watermark(/images/logo_url.png,-10,-10,0):format(jpeg)/images/anatomy_term/superior-pubic-ramus/yHMqGghLCbD9p0yPw3tg_31_Hemipelvis_with_femur_without_ligaments_and__without_muscles_ventral.png "Oberer Schambeinast (Ramus superior ossis pubis)"){kind=logo}
:watermark(/images/logo_url.png,-10,-10,0):format(jpeg)/images/anatomy_term/linea-alba/jtDy9YtpbGFCf4sSHxm48w_Linea_alba_1.png "weiße Linie (Linea alba)"){kind=logo}
:watermark(/images/logo_url.png,-10,-10,0):format(jpeg)/images/anatomy_term/arteria-epigastrica-superficialis/9xW9SYK3k1TGnuLL5HUw_Superficial_epigastric_artery_01.png "oberflächliche Oberbaucharterie (Arteria epigastrica superficialis)"){kind=logo}
:watermark(/images/logo_url.png,-10,-10,0):format(jpeg)/images/anatomy_term/nervus-subcostalis/AWhdSAf8zsw5uKDKlnwohg_Nervus_subcostalis.png "Unterrippennerv (Nervus subcostalis)"){kind=logo}
Die Fasern des M. pyramidalis entspringen am Ramus superior des Os pubis (Schambein) beidseits der Symphyse. Von dort aus verlaufen die Fasern zur Linea alba, welche den M. rectus abdominis in vertikaler Richtung mittig untergliedert.
Die Blutversorgung erfolgt durch die Vasa epigastrica superficialis. Innerviert wird der Muskel durch den N. subcostalis (Th 12) sowie den N. iliohypogastricus aus dem Plexus lumbalis.
Funktion
Die Funktion des M. pyramidalis besteht in der Spannung der Linea alba.
:background_color(FFFFFF):format(jpeg)/images/library/11290/he2aZux2Z9eCJaBSvct5DA_Linea_alba_2.png "Linea alba - Ansicht von anterior"){kind=logo}
Linea alba - Ansicht von anterior
Klinik
Konkrete Pathologien des M. pyramidalis sind nicht beschrieben.
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