Embryologic Development
I. Development of Male Gonads
II. Gonadal Differentiation
III. Genital Duct System
IV. Descent of the Testes
V. External
... [Show More] Genitalia Development
Male Reproductive System
I. Component Parts
II. Scrotum
III. Spermatic Cord
IV. Testis
V. Seminiferous Tubules
VI. Spermatogenesis
A. Spermatogonia
B. Sertoli Cells
C. Myoid Cells
D. Interstitial cells of Leydig
VII. Intratesticular Genital Ducts
VIII. Excretory Genital Ducts
IX. Accessory Genital Glands
X. Pathway of Sperm
XI. Penis
OBJECTIVES
At the end of the lecture, the student should be able to:
1. To name the component parts of the male reproductive system
2. To review development and descent of testes
3. To identify testis, epididymis and vas deferens
4. To understand course and components of spermatic cord
5. To describe prostate and relations (diseases)
6. To name and describe the accessory glands
7. To describe the penis and its component parts
8. To trace the pathway of the sperm
9. To name the layers of the scrotum and their counterparts
10. To describe vascularity, innervation and lymphatics of the male reproductive system
References:
Mescher, AL. 2013.Junquiera's Basic Histology Text and Atlas. 13th ed. Singapore: McGraw-Hill Companies, Inc.
Moore KL, Dalley AF and Agur AMR. 2014. Moore Clinically Oriented Anatomy. 7th Edition, International edition. China: Lippincott Williams &
Wilkins
2016B trans
Italicized texts= quoted from Dr. Bautista
PART 1: EMBRYOLOGIC DEVELOPMENT
I. DEVELOPMENT OF MALE GONADS
Figure 1. Undifferentiated Gonads
A. A 3-week-old embryo showing the primordial germ cells in the wall of the yolk sac close to the attachment of the allantois. B. Migrational path of
the primordial germ cells along the wall of the hindgut and the dorsal mesentery into the genital ridge.
Determined by the SRY - sex determining region of chromosome Y
o Also known as Testis Differentiating Factor
o Presence will trigger development of male gonads. Female gonads develop in its absence.
- NO SRY and Y Chromosome = female gonads, develop into ovaries
- WITH SRY and Y Chromosome = male gonads, develop into testes
Undifferentiated Gonads
Blind end of hindgut expands to form the cloaca.
4mm stage, cloaca eventually expands and divides into 2 portions:
1. Ventral portion (urogenital sinus)
2. Dorsal portion (rectum)
Urorectal Fold [Show Less]