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Embryology of Female Genital System
• Ovary from Coelomic Epithelium
• Uterus from Mullerian Ducts
• Portion of Vagina from Sinovaginal bulb
APPLIED ANATOMY -IMPERFORATE HYMEN
MANAGEMENT
ISTHMUS-
Narrow part between cervix & corpus of uterus.
Same histological structures as corpus of uterus incorporated
into cavity of uterus during pregnancy – isthmus opens up, so
anatomical internal os ceases to exist, only histological os
remains.
Hegar’s sign-
 At 6-10 wks.
 Seen in 2/3rd of cases
 Bimanual palpation
 Fingers of both hands approximate
,there is softening of isthmus with
gestational sac in the upper cavity and
empty lower cavity
Symphysio fundal height ( SFH ) in cm, after 24
weeks upto 36 weeks corresponds to number of
weeks
SFH can be used to clinically calculate the
estimated fetal weight using Johnson’s formula
Fetal weight = (SFH – n) x 155
n=12 if vertex is above ischial spine,
n=11 is vertex is below ischial spine
Arrangement of muscle fibres-
1.Outer longitudinal: hoodlike layer ,arches over fundus and extends
into various ligaments.
2. Middle layer: thickest and strongest, arranged in criss cross
fashion. Apposition of 2 double curve muscle fibres – fig of 8 form
which form the “ living ligatures”.
3. Inner circular: sphincter like fibres around fallopian tube orifices and
internal os of cervix.
• Muscle fibre undergoes elongation,
apposition of 2 double curves make
figure of 8 that contract to occlude
the blood vessels running in
between them.
• CLINICAL SIGNIFICANCE :
occlusion of vessels during
contractions helps in reducing the
amount of blood loss postpartum
Anatomy related to obstetrics (U G).pptx

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Anatomy related to obstetrics (U G).pptx

  • 1. Embryology of Female Genital System • Ovary from Coelomic Epithelium • Uterus from Mullerian Ducts • Portion of Vagina from Sinovaginal bulb
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 9. ISTHMUS- Narrow part between cervix & corpus of uterus. Same histological structures as corpus of uterus incorporated into cavity of uterus during pregnancy – isthmus opens up, so anatomical internal os ceases to exist, only histological os remains.
  • 10.
  • 11. Hegar’s sign-  At 6-10 wks.  Seen in 2/3rd of cases  Bimanual palpation  Fingers of both hands approximate ,there is softening of isthmus with gestational sac in the upper cavity and empty lower cavity
  • 12. Symphysio fundal height ( SFH ) in cm, after 24 weeks upto 36 weeks corresponds to number of weeks SFH can be used to clinically calculate the estimated fetal weight using Johnson’s formula Fetal weight = (SFH – n) x 155 n=12 if vertex is above ischial spine, n=11 is vertex is below ischial spine
  • 13.
  • 14. Arrangement of muscle fibres- 1.Outer longitudinal: hoodlike layer ,arches over fundus and extends into various ligaments. 2. Middle layer: thickest and strongest, arranged in criss cross fashion. Apposition of 2 double curve muscle fibres – fig of 8 form which form the “ living ligatures”. 3. Inner circular: sphincter like fibres around fallopian tube orifices and internal os of cervix.
  • 15. • Muscle fibre undergoes elongation, apposition of 2 double curves make figure of 8 that contract to occlude the blood vessels running in between them. • CLINICAL SIGNIFICANCE : occlusion of vessels during contractions helps in reducing the amount of blood loss postpartum