Early development of the human pelvic diaphragm

Wijnandus Franciscus Robertus Maria Koch

Research output: ThesisPhD Thesis - Research external, graduation UTAcademic

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Abstract

The last decade an increasing interest in the pelvic floor can be observed in medical sciences. The lack of data on the development of the human pelvic floor is striking. The early development of the human pelvic diaphragm was studied. Materials and methodsUse was made of 38 human embryos and fetuses with a crown-rump-length of 9.5 mm to 50 mm, covering the developmental period of 6 to 12 weeks post conception. In five stages the pelvic floor was three dimensionally reconstructed. The different muscles constituting the pelvic diaphragm were identified and their development was described over time. ResultsThe pelvic diaphragm constitutes of two muscles, the m. levatoris ani and the m. coccygeus, anchored to the inner aspect of the pelvis and the m. obturatorius internus, which plays an important role. The muscles are present on the left and right side. The m. levator ani is one single muscle, developing as a part of the external anal sphincter complex. During its development it spreads out over the ventral pelvic outlet in a ventral to dorsal direction. The existence of a separate m. puborectalis or puborectal sling could not be confirmed. The m. coccygeus develops near the future spina ischiadica and grows towards the os coccygis. It is divided in a ventral and dorsal part, forming the actual m. coccygeus and ligamentum sacrospinale respectively. The m. obturatorius internus develops in a dorsal to ventral direction, originating at the level of the femur head and growing into the pelvic cavity. The development induces the formation of the membrana obturatoria. ConclusionThe early development of the pelvic diaphragm could be described and defined over time, bringing new insights to the anatomy of the pelvic floor.
Original languageUndefined
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • Marani, Enrico , Supervisor
Award date30 Jun 2006
Place of PublicationHeerhugowaard
Publisher
Print ISBNs978-90-9020736-0
Publication statusPublished - 30 Jun 2006

Keywords

  • METIS-237823
  • EWI-8839
  • BSS-Neurotechnology and cellular engineering
  • IR-57608

Cite this

Koch, W. F. R. M. (2006). Early development of the human pelvic diaphragm. Heerhugowaard: University of Twente.
Koch, Wijnandus Franciscus Robertus Maria. / Early development of the human pelvic diaphragm. Heerhugowaard : University of Twente, 2006. 127 p.
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keywords = "METIS-237823, EWI-8839, BSS-Neurotechnology and cellular engineering, IR-57608",
author = "Koch, {Wijnandus Franciscus Robertus Maria}",
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Koch, WFRM 2006, 'Early development of the human pelvic diaphragm', University of Twente, Heerhugowaard.

Early development of the human pelvic diaphragm. / Koch, Wijnandus Franciscus Robertus Maria.

Heerhugowaard : University of Twente, 2006. 127 p.

Research output: ThesisPhD Thesis - Research external, graduation UTAcademic

TY - THES

T1 - Early development of the human pelvic diaphragm

AU - Koch, Wijnandus Franciscus Robertus Maria

PY - 2006/6/30

Y1 - 2006/6/30

N2 - The last decade an increasing interest in the pelvic floor can be observed in medical sciences. The lack of data on the development of the human pelvic floor is striking. The early development of the human pelvic diaphragm was studied. Materials and methodsUse was made of 38 human embryos and fetuses with a crown-rump-length of 9.5 mm to 50 mm, covering the developmental period of 6 to 12 weeks post conception. In five stages the pelvic floor was three dimensionally reconstructed. The different muscles constituting the pelvic diaphragm were identified and their development was described over time. ResultsThe pelvic diaphragm constitutes of two muscles, the m. levatoris ani and the m. coccygeus, anchored to the inner aspect of the pelvis and the m. obturatorius internus, which plays an important role. The muscles are present on the left and right side. The m. levator ani is one single muscle, developing as a part of the external anal sphincter complex. During its development it spreads out over the ventral pelvic outlet in a ventral to dorsal direction. The existence of a separate m. puborectalis or puborectal sling could not be confirmed. The m. coccygeus develops near the future spina ischiadica and grows towards the os coccygis. It is divided in a ventral and dorsal part, forming the actual m. coccygeus and ligamentum sacrospinale respectively. The m. obturatorius internus develops in a dorsal to ventral direction, originating at the level of the femur head and growing into the pelvic cavity. The development induces the formation of the membrana obturatoria. ConclusionThe early development of the pelvic diaphragm could be described and defined over time, bringing new insights to the anatomy of the pelvic floor.

AB - The last decade an increasing interest in the pelvic floor can be observed in medical sciences. The lack of data on the development of the human pelvic floor is striking. The early development of the human pelvic diaphragm was studied. Materials and methodsUse was made of 38 human embryos and fetuses with a crown-rump-length of 9.5 mm to 50 mm, covering the developmental period of 6 to 12 weeks post conception. In five stages the pelvic floor was three dimensionally reconstructed. The different muscles constituting the pelvic diaphragm were identified and their development was described over time. ResultsThe pelvic diaphragm constitutes of two muscles, the m. levatoris ani and the m. coccygeus, anchored to the inner aspect of the pelvis and the m. obturatorius internus, which plays an important role. The muscles are present on the left and right side. The m. levator ani is one single muscle, developing as a part of the external anal sphincter complex. During its development it spreads out over the ventral pelvic outlet in a ventral to dorsal direction. The existence of a separate m. puborectalis or puborectal sling could not be confirmed. The m. coccygeus develops near the future spina ischiadica and grows towards the os coccygis. It is divided in a ventral and dorsal part, forming the actual m. coccygeus and ligamentum sacrospinale respectively. The m. obturatorius internus develops in a dorsal to ventral direction, originating at the level of the femur head and growing into the pelvic cavity. The development induces the formation of the membrana obturatoria. ConclusionThe early development of the pelvic diaphragm could be described and defined over time, bringing new insights to the anatomy of the pelvic floor.

KW - METIS-237823

KW - EWI-8839

KW - BSS-Neurotechnology and cellular engineering

KW - IR-57608

M3 - PhD Thesis - Research external, graduation UT

SN - 978-90-9020736-0

PB - University of Twente

CY - Heerhugowaard

ER -

Koch WFRM. Early development of the human pelvic diaphragm. Heerhugowaard: University of Twente, 2006. 127 p.