Reappraisal of intergender differences in the urethral striated sphincter explains why a completely circular arrangement is difficult in females: a histological study using human fetuses / 대한해부학회지
Anatomy & Cell Biology
;
: 79-85, 2012.
Article
Dans Anglais
| WPRIM
| ID: wpr-138735
ABSTRACT
To investigate why the development of a completely circular striated sphincter is so rare, we examined histological sections of 11 female and 11 male mid-term human fetuses. In male fetuses, the striated muscle initially extended in the frontal, rather than in the horizontal plane. However, a knee-like portion was absent in the female fetal urethra because, on the inferior side of the vaginal end, a wide groove for the future vestibule opened inferiorly. Accordingly, it was difficult for the developing striated muscle to surround the groove, even though there was not a great difference in width or thickness between the female vestibule and the male urethra. The development of a completely circular striated sphincter seems to be impossible in females because of interruption of the frontal plane by the groove-like vestibule. However, we cannot rule out the possibility that before descent of the vagina, the urethral striated muscle extends posteriorly.
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Urètre
/
Vagin
/
Muscle strié
/
Foetus
Limites du sujet:
Femelle
/
Humains
/
Mâle
langue:
Anglais
Texte intégral:
Anatomy & Cell Biology
Année:
2012
Type:
Article
Documents relatifs à ce sujet
MEDLINE
...
LILACS
LIS