Download MBBS Anatomy PPT 2 Development Of Genital System Notes

Download MBBS (Bachelor of Medicine, Bachelor of Surgery) Human Anatomy ppt lectures Topic 2 Development Of Genital System Notes. - anatomy ppt free download human anatomy ppt lectures, medicine notes ppt, anatomy handwritten notes pdf, mbbs 1st year anatomy notes pdf download, best anatomy notes pdf, human anatomy notes pdf, anatomy easy notes pdf, anatomy notes online, anatomy short notes, Anatomy ppt, Powerpoint Presentations and lecture notes.







URINARY BLADDER

MALE
PELVIS

MALE
URETHRA




FEMALE
PELVIS
















Genital ducts in the

female at the end of the

second month. Note

the paramesonephric

(m?ullerian) tubercle and

formation of the uterine

canal. B. Genital

ducts after descent of the

ovary. The only parts

remaining from the

mesonephric system

are the epoophoron,

paroophoron, and

Gartner's cyst. Note the

suspensory ligament of

the ovary, ligament of the

ovary proper, and round

ligament of the uterus.

















Patient with

hypospadias.

The urethra is

open on the

ventral

surface of

the penis.





DESCENT OF THE TESTES

? TOWARD THE END OF THE SECOND MONTH,

THE UROGENITAL MESENTERY ATTACHES

THE TESTIS AND MESONEPHROS TO THE

POSTERIOR ABDOMINAL WALL

? WITH DEGENERATION OF THE

MESONEPHROS, THE ATTACHMENT SERVES

AS A MESENTERY FOR THE GONAD

? CAUDALLY, IT BECOMES LIGAMENTOUS AND

IS KNOWN AS THE CAUDAL GENITAL

LIGAMENT.

? ALSO EXTENDING FROM THE CAUDAL POLE

OF THE TESTIS IS A MESENCHYMAL

CONDENSATION RICH IN EXTRACELLULAR

MATRICES, THE GUBERNACULUM

? PRIOR TO DESCENT OF THE TESTIS, THIS BAND

OF MESENCHYME TERMINATES IN THE INGUINAL
REGION BETWEEN THE DIFFERENTIATING
INTERNAL AND EXTERNAL ABDOMINAL
OBLIQUE MUSCLES.

? LATER, AS THE TESTIS BEGINS TO DESCEND

TOWARD THE INGUINAL RING, AN EXTRA-
ABDOMINAL PORTION OF THE GUBERNACULUM
FORMS AND GROWS FROM THE INGUINAL
REGION TOWARD THE SCROTAL SWELLINGS.

? WHEN THE TESTIS PASSES THROUGH THE

INGUINAL CANAL, THIS EXTRA-ABDOMINAL
PORTION CONTACTS THE SCROTAL FLOOR
FACTORS CONTROLLING

DESCENT OF THE TESTIS

? OUTGROWTH OF THE EXTRA-ABDOMINAL PORTION OF

THE GUBERNACULUM PRODUCES INTRA-ABDOMINAL
MIGRATION

? AN INCREASE IN INTRA-ABDOMINAL PRESSURE DUE TO

ORGAN GROWTH PRODUCES PASSAGE THROUGH THE
INGUINAL CANAL

? REGRESSION OF THE EXTRA-ABDOMINAL PORTION OF

THE GUBERNACULUM COMPLETES MOVEMENT OF THE
TESTIS INTO THE SCROTUM

? NORMALLY, THE TESTES REACH THE INGUINAL REGION

BY APPROXIMATELY 12 WEEKS' GESTATION,

? MIGRATE THROUGH THE INGUINAL CANAL

BY 28 WEEKS

? REACH THE SCROTUM BY 33 WEEKS
? THE PROCESS IS INFLUENCED BY

HORMONES, INCLUDING ANDROGENS AND
MULLERIAN INHIBITING SUBSTANCE (MIS)

? DURING DESCENT, BLOOD SUPPLY TO THE

TESTIS FROM THE AORTA IS RETAINED,
AND TESTICULAR VESSELS EXTEND FROM
THEIR ORIGINAL LUMBAR POSITION TO
THE TESTIS IN THE SCROTUM.

? INDEPENDENTLY FROM DESCENT OF THE

TESTIS, THE PERITONEUM OF THE

ABDOMINAL CAVITY FORMS AN

EVAGINATION ON EACH SIDE OF THE

MIDLINE INTO THE VENTRAL ABDOMINAL

WALL.

? THIS EVAGINATION, THE PROCESSUS

VAGINALIS, FOLLOWS THE COURSE OF

THE GUBERNACULUM TESTIS INTO THE

SCROTAL SWELLINGS

? HENCE THE PROCESSUS VAGINALIS,

ACCOMPANIED BY THE MUSCULAR AND

FASCIAL LAYERS OF THE BODY WALL,

EVAGINATES INTO THE SCROTAL

SWELLING, FORMING THE INGUINAL CANAL

? THE TESTIS DESCENDS THROUGH THE INGUINAL

RING AND OVER THE RIM OF THE PUBIC BONE

AND IS PRESENT IN THE SCROTUM AT BIRTH.

? THE TESTIS IS THEN COVERED BY A REFLECTED

FOLD OF THE PROCESSUS VAGINALIS

? THE PERITONEAL LAYER COVERING THE TESTIS IS

THE VISCERAL LAYER OF THE TUNICA VAGINALIS;

? THE REMAINDER OF THE PERITONEAL SAC FORMS

THE PARIETAL LAYER OF THE TUNICA VAGINALIS

? THE NARROW CANAL CONNECTING THE LUMEN

OF THE VAGINAL PROCESS WITH THE

PERITONEAL CAVITY IS OBLITERATED AT BIRTH

OR SHORTLY THEREAFTER


? IN ADDITION TO BEING COVERED BY PERITONEAL

LAYERS DERIVED FROM THE PROCESSUS

VAGINALIS, THE TESTIS BECOMES ENSHEATHED

IN LAYERS DERIVED FROM THE ANTERIOR

ABDOMINAL WALL THROUGH WHICH IT PASSES.

? THUS, THE TRANSVERSALIS FASCIA FORMS THE

INTERNAL SPERMATIC FASCIA

? THE INTERNAL ABDOMINAL OBLIQUE MUSCLE

GIVES RISE TO THE CREMASTERIC FASCIA

? MUSCLE, AND THE EXTERNAL ABDOMINAL

OBLIQUE MUSCLE FORMS THE EXTERNAL

SPERMATIC FASCIA

? THE TRANSVERSUS ABDOMINIS MUSCLE DOES

NOT CONTRIBUTE A LAYER, SINCE IT ARCHES

OVER THIS REGION AND DOES NOT COVER THE

PATH OF MIGRATION.

HERNIAS AND CRYPTORCHISM

? THE CONNECTION BETWEEN THE ABDOMINAL

CAVITY AND THE PROCESSUS VAGINALIS IN THE

SCROTAL SAC NORMALLY CLOSES IN THE FIRST

YEAR AFTER BIRTH

? IF THIS PASSAGEWAY REMAINS OPEN,

INTESTINAL LOOPS MAY DESCEND INTO THE

SCROTUM, CAUSING A CONGENITAL INGUINAL

HERNIA

? SOMETIMES OBLITERATION OF THIS

PASSAGEWAY IS IRREGULAR, LEAVING SMALL

CYSTS ALONG ITS COURSE.

? LATER THESE CYSTS MAY SECRETE FLUID,

FORMING A HYDROCELE OF THE TESTIS AND/OR

SPERMATIC CORD

? IN 97% OF MALE NEWBORNS, TESTES ARE

PRESENT IN THE SCROTUM BEFORE BIRTH.

IN MOST OF THE REMAINDER, DESCENT

WILL BE COMPLETED DURING THE FIRST 3

MONTHS POSTNATALLY.

? IN LESS THAN 1% OF INFANTS, ONE OR

BOTH TESTES FAIL TO DESCEND. THE

CONDITION IS CALLED CRYPTORCHIDISM

AND MAY BE CAUSED BY DECREASED

ANDROGEN (TESTOSTERONE)

PRODUCTION.

? THE UNDESCENDED TESTES FAIL TO

PRODUCE MATURE SPERMATOZOA AND

THE CONDITION IS ASSOCIATED WITH A 3%

TO 5% INCIDENCE OF RENAL ANOMALIES.








DERIVATIVES OF THE MESONEPHERIC DUCT

? MALES:
FUNCTIONAL:
1. EFFERENT DUCTULES OF TESTIS
2. DUCT OF EPIDIDYMIS
3. VAS DEFERENCE
4. SEMINAL VESICLES
5. COMMON EJACULATORY DUCT
6. URETRIC BUD ? COLLECTING PART OF
KIDNEY
7. TRIGONE OF BLADDER

NON FUNCTIONAL DERIVATIVES OF

MESONEPHERIC TUBULES

? MALE:
? 1. SUPERIOR ABERRANT DUCTULES

OF TESTIS

? 2. INFERIOR ABERRANT DUCTULES

OF TESTIS

? 3. APPENDIX OF EPIDIDYMIS

REMNANTS OF PARAMESONEPHERIC

DUCTS

? MALES;
? 1. APPENDIX OF TESTIS
? 2. PROSTATIC UTRICLE


REMANANTS OF THE MESONEPHERIC

TUBULES

? FEMALES:
? 1. TUBULES OF EPOOPHORON
? 2. TUBULES OF PARA EPOOPHORON

REMANANTS OF THE MESONEPHERIC DUCT

? 1. DUCT OF EPOOPHORON? GARTNERS
DUCT
? 2. DUCT OF PARA EPOOPHORON
? 1. When does the metanephros become
? functional?
? (A) At week 3 of development
? (B) At week 4 of development
? (C) At week 10 of development
? (D) Just before birth
? (E) Just after birth

? 1. When does the metanephros become
? functional?
? (A) At week 3 of development
? (B) At week 4 of development
? (C) At week 10 of development(+)
? (D) Just before birth
? (E) Just after birth

. The proximal convoluted tubules of the
definitive adult kidney are derived from the
? (A) ureteric bud
? (B) metanephric vesicle
? (C) mesonephric duct
? (D) mesonephric tubules
? (E) pronephric tubules
? The proximal convoluted tubules of the
? definitive adult kidney are derived from the
? (A) ureteric bud
? (B) metanephric vesicle(+)
? (C) mesonephric duct
? (D) mesonephric tubules
? (E) pronephric tubules

? The transitional epithelium lining the urinary
bladder is derived from
? (A) ectoderm
? (B) endoderm
? (C) mesoderm
? (D) endoderm and mesoderm
? (E) neural crest cells

? The transitional epithelium lining the urinary
? bladder is derived from
? (A) ectoderm
? (B) endoderm(+)
? (C) mesoderm
? (D) endoderm and mesoderm
? (E) neural crest cells

? The transitional epithelium lining the
? ureter is derived from
? (A) ectoderm
? (B) endoderm
? (C) mesoderm(+)
? (D) endoderm and mesoderm
? (E) neural crest cells
? The transitional epithelium lining the
? ureter is derived from
? (A) ectoderm
? (B) endoderm
? (C) mesoderm(+)
? (D) endoderm and mesoderm
? (E) neural crest cells

? Immediately after birth of a boy, a moist,

red protrusion of tissue is noted just superior

to his pubic symphysis. After observation,

urine drainage is noted from the upper lateral

corners of this tissue mass. What is the

diagnosis?
? (A) Pelvic kidney
? (B) Horseshoe kidney
? (C) Polycystic disease of the kidney
? (D) Urachal cyst
? (E) Exstrophy of the bladder

? Immediately after birth of a boy, a moist,
? red protrusion of tissue is noted just superior
? to his pubic symphysis. After observation,
? urine drainage is noted from the upper lateral
? corners of this tissue mass. What is the
? diagnosis?
? (A) Pelvic kidney
? (B) Horseshoe kidney
? (C) Polycystic disease of the kidney
? (D) Urachal cyst
? (E) Exstrophy of the bladder(+)

? The indifferent embryo begins
? phenotypic sexual differentiation during
? (A) week 3 of development
? (B) week 5 of development
? (C) week 7 of development
? (D) week 12 of development
? (E) week 20 of development
? The indifferent embryo begins
? phenotypic sexual differentiation during
? (A) week 3 of development
? (B) week 5 of development
? (C) week 7 of development(+)
? (D) week 12 of development
? (E) week 20 of development

? A structure found within the adult female
pelvis formed from the gubernaculum is the
? (A) broad ligament
? (B) suspensory ligament of the ovary
? (C) round ligament of the uterus
? (D) medial umbilical ligament
? (E) median umbilical ligament

? A structure found within the adult female
pelvis formed from the gubernaculum is the
? (A) broad ligament
? (B) suspensory ligament of the ovary
? (C) round ligament of the uterus(+)
? (D) medial umbilical ligament
? (E) median umbilical ligament

? The labia minora arise embryologically
from which of the following structures?
? (A) Phallus
? (B) Labioscrotal swellings
? (C) Sinovaginal bulbs
? (D) Urogenital folds
? (E) Paramesonephric duct
? The labia minora arise embryologically
from which of the following structures?
? (A) Phallus
? (B) Labioscrotal swellings
? (C) Sinovaginal bulbs
? (D) Urogenital folds(+)
? (E) Paramesonephric duct

? In the male, failure of the urethral folds to
? fuse completely results in
? (A) hypospadias
? (B) epispadias
? (C) cryptorchidism
? (D) congenital inguinal hernia
? (E) hydrocele

? In the male, failure of the urethral folds to
fuse completely results in
? (A) hypospadias(+)
? (B) epispadias
? (C) cryptorchidism
? (D) congenital inguinal hernia
? (E) hydrocele

? The Y chromosome carries a gene on its
? short arm that codes for
? (A) testosterone
? (B) MIF
? (C) testes-determining factor (TDF)
? (D) progesterone
? (E) estrogen
? The Y chromosome carries a gene on its
? short arm that codes for
? (A) testosterone
? (B) MIF
? (C) testes-determining factor (TDF)(+)
? (D) progesterone
? (E) estrogen

? Bilateral cryptorchidism usually results in
? (A) impotence
? (B) sterility
? (C) male pseudo-intersexuality
? (D) female pseudo-intersexuality
? (E) testicular feminization syndrome

This post was last modified on 05 April 2022