Anatomy Lecture 4 Embryology Flashcards Preview

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Flashcards in Anatomy Lecture 4 Embryology Deck (48)
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1

Define gastrulation

formation of the trilaminar disc

2

Name the germ layers

Ectoderm
Mesoderm
Endoderm

3

Name the 3 groups of mesoderm

Paraxial
Intermediate
Lateral plane

4

Invagination of the ______ through the primitive streak forms the endoderm and mesoderm.

Invagination of the EPIBLAST CELLS through the primitive streak forms the endoderm and mesoderm.

5

What germ layer do the genitals arise from?

Intermediate mesoderm

6

What germ layer does the urinary system arise from?

Intermediate mesoderm

7

What is the cloaca?

Cavity of urogenital ducts in early foetus

8

At what week do the primordial germ cells within the yolk sac migrate to intermediate mesoderm?

Weeks 4-6

9

Coelomic epithelium proliferates and thickens to form ______.

Coelomic epithelium proliferates and thickens to form GENITAL RIDGES.

10

Proliferating epithelium will form somatic supports cells which envelop the primordial germ cells. This forms __________.

Proliferating epithelium will form somatic supports cells which envelop the primordial germ cells. This forms PRIMITIVE SEX CORDS.

11

What is the other name of the Wollfian duct?

Mesonephric duct

12

What is the other name of the Mullerian duct

Paramesonephric duct

13

The mesonephric and paramesonephric duct connect to the posterior wall of the _______.

The mesonephric and paramesonephric duct connect to the posterior wall of the UROGENITAL SINUS.

14

What phase of development happens when the indifferent gonad is present?

Bipotential phase

15

Sexual differentiation occurs from week ____ onwards.

week 7

16

In male development, the SRY region triggers the somatic support cells differentiate into ______.

Sertoli cells

17

In male development, the primary sex cords form the ______.

Testis cords aka medullary cords

18

Internal male genital is triggered by the ______.

Presence of the sex determining region on the Y chromosome

19

The ______ connect the mesonephric tubules to the testis cords.

The RETE TESTIS connect the mesonephric tubules to the testis cords.

20

Between the coelomic epithelium and testis cords, a thickened layer of connect tissue forms the ________.

Between the coelomic epithelium and testis cords, a thickened layer of connect tissue forms the TUNICA ALBUGINEA.

21

Sertoli cells secrete _____ which leads to the degeneration of the _____ duct.

Sertoli cells secrete ANTI-MULLERIAN HORMONE which leads to the degeneration of the PARAMESONEPHRIC duct.

22

Sertoli cells stimulate ______ to form ______ which secrete testosterone.

Sertoli cells stimulate GONADAL RIDGE CELLS to form LEYDIG CELLS which secrete testosterone.

23

______ (hormone) induces the formation of the epididymis, seminal vesicles and vas D from the ______ duct.

TESTOSTERONE (hormone) induces the formation of the epididymis, seminal vesicles and vas D from the MESONEPHRIC duct.

24

A mutation in anti-Mullerian hormone or is receptors would mean the Mullerian (paramesonephric) ducts would fail to regress. What is the name of this syndrome?

Persistent Mullerian Duct syndrome

25

In persistent Mullerian duct syndrome, do the external genitalia resemble a male or female?

Male

26

In persistent Mullerian duct syndrome, which internal genital organs are present?

Vagina, uterus, uterine tubes, testis

27

What vertebral level to the testis originate at?

T10

28

Gubernaculum aids the descents of the ____ in males.

Testis

29

Put these covering of the testis in order from deep to superficial:
-Scrotum
-Internal spermatic fascia
-Tunica vaginalis
-External spermatic fascia
-Cremaster muscle

-Tunica vaginalis
-Internal spermatic fascia
-Cremaster muscle
-External spermatic fascia
-Scrotum

30

The prostate, bulbourethral glands and seminal vesicles are ______ of the male genital system

accessory glands