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Gross Anatomy Of Uterus | External & Internal Feature |

The Uterus is the childbearing organ in females it provides suitable site and environment for implantation  of a fertilized ovum and development of the embryo.

Gross Anatomy Of Uterus  External & Internal Feature
Image Credit: Britannica

Uterus is a hollow thick walled muscular with a narrow lumen.

Its is situated obliquely in the lesser pelvis between urinary bladder and rectum.

Its long axis is horizontal if the bladder is empty in the erect posture.

Gross Anatomy Of Uterus | External & Internal Feature |

Shape & Size: It is pear shaped being flattened Antero Posteriorly

Length           : 3 inch (7.5cm)

Breath            : 2inch (5 cm) 

Thickness      : 1inch (2.5 cm)

Weight            : 30 - 40 g

Body: 

  • The upper expanded dome like end of the body is called fundus.
  • The body extends from the fundus contains the uterine cavity.
Anterior Surface:

It is flat and directed downward and forward it is covered by the peritoneum up to the isthmus where it is reflected to the upper surface of the urinary bladder forming uterovesical pouch.

Posterior Surface:

It is convex and directed and upward and backward, it is covered by the peritoneum which is extended downward up to posterior form of vagina.

Right & Left Border:

Each lateral border is rounded & related to the uterine artery. It i non peritoneal for its provide attachment to the border ligament of uterus.

Cervix:

It is the lower cylindrical part. its lower part projects into the upper part of the vagina through its interior wall.

Its divided into 

  1. Upper vaginal part
  2. Lower vaginal part
Read : Distinguish Between Mitosis & Meiosis 

Relation of the uterus 

Anteriorly

  1. The body of uterus is related to the uterovesical pouch and superior surface of urinary bladder.
  2. The Supra vaginal portion of cervix is related to the posterior surface of urinary bladder.
  3. The Vaginal portion of cervix is related to the anteriorly formix of the vagina.

Posteriorly 

  • The body of the cervix
  • The spuravaginal portion of cervix
  • The vaginal portion of cervix

Laterally

  • The body of uterus 
  • The supravaginal portion of cervix
  • The vaginal portion of cervix

Arterial Supply 

The Uterus i supplied mainly two uterine arteries and partially by two ovarian arteries.
The uterine artery is a branch of anterior division of internal iliac artery.

Branch And Division

  • Close to the cervix
  • Along the side of the body of the uterus
  • Along the fallopian tube.

Nerve Supply 

  1. The sympathetic fibre are derived from T12 & L2 spinal segment. It cause uterine contraction and vasocontraction.
  2. The parasympathetic Fibre are derived from S2 to S4 segment.
Read: Fourth Ventricle Of Hind Brain

Support of Uterus

Primary Support

(1) Muscular
  • Pelvic Diaphragm
  • Perineal Body
  • Urogenital Diaphragm  
(2) Visceral
  • Urinary Bladder
  • Vagina
  • Uterine Axis
(3) Fibromuscular
  • Transverse cervical ligament
  • Pubocervical ligament
  • Uterosacral ligament
  • Round ligament of uterus

Secondary Support

  • Broad Ligament 
  • Uterovescial fold of peritoneum 
  • Rectovaginal fold of peritoneum

Applied Anatomy of Uterus

  • Cervical Carcinoma: It is most common cancer in female. it sis rarely occur at the age of 20-22 and increase chances of 42-45. It is also occur due to easy sexual exposure.

  • Cesarean Uterus: It is surgically doing the uterus for delivering the baby when the vaginal delivery is not possible.

  • Fibroids Of Uterus: Tumor appear in the uterus. it is appear at the one fifth i.e at age of 35.

  • Uterus Cancer

  • Hysterectomy


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