SPERMATOGENESIS AND OOGENESIS Flashcards
WHERE PRIMORDIAL GERM CELL COME FROM
DERIVED FROM EPIBLAST CELLS
IN WHICH WEEK DO THEY MIGRATE TO GENITAL RIDGE
8TH WEEK
WHEN SPERMATOGENESIS BEGINS
BEGINS AT PUBERTY
SEX CORDS IN TESTES DEVELOP A LUMEN BECOME SEMINIFEROUS TUBULES
WHERE OCCURS THE SPERMATOGENESIS
SEMINIFEROUS TUBULES
WHAT IS SPERMATOGONIA
2N2C CELLS
SPERMATOGENESIS BEGINS WITH SPERMATOGONIA
DERIVED FROM PRIMORDIAL GERM CELLS
PRECURSORS OF SPERMATOZOA
WHAT IS SPERMATOCYTES
TWO TYPES> PRIMARY AND SECONDARY
1- PRIMARY SPERMATOCYTES > 2N4C CELLS FROM SPERMATOGONIA , DNA SYNTHESIS COMPLETED, STARTING MEIOSIS I
2- SECONDARY SPERMATOCYTES > MEIOSIS I COMPLETED, STARTING MEIOSIS II, 1N2C
SPERMATIDS
1N1C
AFTER MEIOSIS II
THE SPERMATIDS HAVE TO UNDERGO A PORCESS CALLED SPERMIOGENESIS
EXPLAIN SPERMIOGENESIS IS
IS THE PROCESS WHERE SPERMATIDS FORM SPERMATOZOA OR SPERM, THE SINGULAR IS SPERMATOZOON
FORMATION OF ACROSOME > CAP OF SPERM, CONTAINS ENZYMES TO ASSIST IN FERTILIZATION.
THE PORCESS ALSO INVOLVES CONDENSATION OF THE NUCLEUS, FORMATION OF THE NECK AND TAIL
SERTOLI CELLS
LINE WALLS OF SEMINIFEROUS TUBULES
NO GERM CELLS
SUPPORT AND NOURISH DEVELOPING SPERMATOZOA
REGULATE SPARMETOGENESIS
STIMULATED BY FSH
SUPPORTED BY LEYDIG CELLS TESTOSTERONE /PARACRINE/
NEEDS FSH AND LH FOR NORMAL SPERMATOGENESIS
FORM BLOOD TESTIS BARRIER> tight junctions between adjacent sertoli cells / apical side (toward tubule) meiosis, spermiogenesis.
basal side / spermatogonia cell division
isolates sperm> protection from the inmmunne attack
SERTOLI CELLS ARE TEMPERATURE SESITIVE
LEYDIG CELLS
SECRETE TESTOSTERONE IN THE PRESENCE OF LH
TESTORENE PRODUCTION UNAFFECTED BY TEMPERATURE.
EXPLAIN THE OOGENESIS IS
PRIMORDIAL GERM CELLS IS OOGONIA - 2N2C
OOGINA DIVIDE IN UTERO
OOGONIA FORMS PRIMARY OOCYTE 2N4C
MAXIMUN NUMBER FORMED BY 5TH MONTH IN UTERO - ABOUT 7 MILLION -
