Development of The Reproductive System - Diagram of Internal Differentiation

Diagram of Internal Differentiation

A.—Diagram of the primitive urogenital organs in the embryo previous to sexual distinction.

  • 3. Ureter.
  • 4. Urinary bladder.
  • 5. Urachus.
  • cl. Cloaca.
  • cp. Elevation which becomes clitoris or penis.
  • i. Lower part of the intestine.
  • ls. Fold of integument from which the labia majora or scrotum are formed.
  • m, m. Right and left Müllerian ducts uniting together and running with the Wolffian ducts in gc, the genital cord.
  • ot. The genital ridge from which either the ovary or testis is formed.
  • ug. Sinus urogenitalis.
  • W. Left Wolffian body.
  • w, w. Right and left Wolffian ducts.

B.—Diagram of the female type of sexual organs.

  • C. Greater vestibular gland, and immediately above it the urethra.
  • cc. Corpus cavernosum clitoridis.
  • dG. Remains of the left Wolffian duct, such as give rise to the duct of Gärtner, represented by dotted lines; that of the right side is marked w.
  • f. The abdominal opening of the left uterine tube.
  • g. Round ligament, corresponding to gubernaculum.
  • h. Situation of the hymen.
  • i. Lower part of the intestine.
  • l. Labium major.
  • n. Labium minus.
  • o. The left ovary.
  • po. Epoophoron.
  • sc. Corpus cavernosum urethrae.
  • u. Uterus. The uterine tube of the right side is marked m.
  • v. Vulva.
  • va. Vagina.
  • W. Scattered remains of Wolffian tubes near it (paroöphoron of Waldeyer).

C.—Diagram of the male type of sexual organs.

  • C. Bulbo-urethral gland of one side.
  • cp. Corpora cavernosa penis cut short.
  • e. Caput epididymis.
  • g. The gubernaculum.
  • i. Lower part of the intestine.
  • m. Müllerian duct, the upper part of which remains as the hydatid of Morgagni; the lower part, represented by a dotted line descending to the prostatic utricle, constitutes the occasionally existing cornu and tube of the uterus masculinus.
  • pr. The prostate.
  • s. Scrotum.
  • sp. Corpus cavernosum urethrae.
  • t. Testis in the place of its original formation.
  • t’, together with the dotted lines above, indicates the direction in which the testis and epididymis descend from the abdomen into the scrotum.
  • vd. Ductus deferens.
  • vh. Ductus aberrans.
  • vs. The vesicula seminalis.
  • W. Scattered remains of the Wolffian body, constituting the organ of Giraldès, or the paradidymis of Waldeyer.

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