Embryology Test (Part 1)

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1) At what age does meconium first appear in the fetal terminal ilium?

A) 2‐4 weeks gestation

B) 10‐16 weeks gestation

C) 18‐26 weeks gestation

D) 24‐30 weeks gestation

E) 34‐38 weeks gestation

2) The round ligament develops from which structure?

A) Gubernaculum

B) Urachus

C) Allantois

D) Medial umbilical ligament

E) Median umbilical ligament

3) From which germ layer does the Pancreas develop? A) 6 weeks gestation

A) Neural tube of Ectoderm

B) Neural crest of Ectoderm

C) Intermediate Mesoderm

D) Coelom

E) Endoderm

4) Which of the following is a feature of intestinal malrotation?

A) Ladd's bands

B) Meckel's diverticulum

C) Angelman syndrome

D) Cecal Diverticula

E) Fibrous band of Champenois

5) What is the innervation to the sigmoid colon?

A) T5‐T9

B) T10/11

C) T12/L1

D) L1/L2

E) L2/L3

6) When does Oocytogenesis complete?

A) 6 weeks gestation

B) 18 weeks gestation

C) Birth

D) Puberty

E) Ovulation

7) What process would you expect a secondary spermatocyte to undergo during spermatogenesis?

A) 1st Meiotc Division

B) 2nd Meiotc Division

C) 1st Mitotic Division

D) 2nd Mitotic Division

E) Differentiation

8) What is the principle arterial supply to the jejunum?

A) Superior Mesenteric

B) Inferior Mesenteric

C) Coeliac Trunk

D) Splenic

E) Inferior rectal

9) How many days after fertilisation does the morula form?

A) 1

B) 2

C) 9

D) 4

E) 6

10) From which germ layer does the myenteric plexus of the GI tract developed: A) 6 weeks gestation

A) Neural crest of Ectoderm

B) Neural tube of Ectoderm

C) Mesoderm

D) Endoderm

E) None of the above

11) The external carotid artery develops from which pharyngeal arch?

A) 1st

B) 2nd

C) 3rd

D) 4th

E) 6th

12) The second pharyngeal arch gives rise to which of the following structures?

A) Vagus Nerve

B) Thyroid cardilage

C) Muscles of facial expression

D) Intrinsic muscles of larynx

E) Trigeminal Nerve

13) Branches V2 and V3 of the Trigeminal nerve develop from which pharyngeal arch?

A) 1st

B) 2nd

C) 3rd

D) 4th

E) 6th

14) A Bicornuate uterus is due to which of the following?

A) Crossed fused ectopia

B) Abnormal fusion and reabsorption of the paramesonephric ducts

C) PKD‐1 gene mutations

D) Mullerian agenesis

E) None of the above

15) At what gestation does physiological gut herniation occur?

A) 1 week

B) 3 weeks

C) 5 weeks

D) 8 weeks

E) 12 weeks

16) Approximately how many oocytes are present in the ovaries at birth?

A) 1,000

B) 10,000

C) 100,000

D) 1 million

E) 10 million

17) Somites are derived from which germ layer?

A) Endoderm

B) Ectoderm

C) Intermediate Mesoderm

D) Paraaxial Mesoderm

E) Lateral Plate Mesoderm

18) Which pharyngeal arch is closest to the head of the embryo?

A) 1st

B) 2nd

C) 3rd

D) 4th

E) 6th

19) Ootidogenesis refers to which process during Oogenesis?

A) 1st Meiotic Division

B) 2nd Meiotic Division

C) 1st and 2nd Meiotic Divisions

D) Differentiation

E) Growth and maturation

20) What is the principle arterial supply to the ascending colon? A) Neural crest of Ectoderm

A) Superior Rectal

B) Renal

C) Coeliac Trunk

D) Inferior Mesenteric

E) Superior Mesenteric

21) What is the innervation to the 4th part of duodenum?

A) T5‐T9

B) T10/T11

C) T12/L1

D) L2/L3

E) L3/L4

22) During oogenesis which cell type has the greatest number of chromatids?A) Neural crest of Ectoderm

A) Oogonium

B) Primary Oocyte

C) Secondary Oocyte

D) Ootid

E) Ovum

23) From what does the blastocyst hatch?

A) Cumulus oophorus

B) Corona radiata

C) Perivitelline space

D) Trophectoderm

E) Zona Pellucida

24) The 6th pharyngeal arch gives rise to which of the following?

A) Cranial Nerve VI

B) Muscles of facial expression

C) Muscles of mastication

D) Intrinsic muscles of larynx

E) Facial nerve

25) Which pharyngeal arch gives rise to no muscular or skeletal structures?

A) 1st

B) 2nd

C) 3rd

D) 4th

E) 5th

26) From which germ layer does the kidney develop?

A) Endoderm

B) Ectoderm

C) Intermediate mesoderm

D) paraxial mesoderm

E) lateral plate mesoderm

27) From which germ layer does the Pituitary develop?

A) Endoderm

B) Ectoderm

C) Intermediate mesoderm

D) Paraxial mesoderm

E) Lateral plate mesoderm

28) The thyroid cartilage and cricothyroid muscle develop from which pharyngeal arch?

A) 1st

B) 2nd

C) 3rd

D) 4th

E) 6th

29) Which of the following structures develop from the mesodermal somites?

A) Epidermis

B) Neural Crest

C) Liver

D) Pancreas

E) Ribs

30) How many days after fertilisation does the blastocyst form?

A) 1 day

B) 2 days

C) 3 days

D) 4 days

E) 5 days

31) The third pharyngeal arch gives rise to which of the following structures?

A) Thrigeminal Nerve

B) Glossopharyngeal nerve

C) Facial nerve

D) Vagus nerve

E) Muscles of mastication

32) During formation of the mid, fore and hind guts the initial gut tube undegoes rotation. Which of the following is correct regarding rotation of the midgut during this process?

A) rotates 90 degrees clockwise

B) rotates 130 degrees anticlockwise

C) rotates 180 degrees clockwise

D) rotates 270 degrees anticlockwise

E) rotates 270 degrees clockwise

33) From which germ cell layer does the GI tract initially develop? A) Neural crest of Ectoderm

A) Endoderm

B) Ectoderm

C) Lateal Plate Mesoderm

D) Paraxial Mesoderm

E) Intermediate

34) The subclavian artery develops from which pharyngeal arch?

A) 1st

B) 2nd

C) 3rd

D) 5th

E) 4th

35) The placenta develops from which structure?A) 6 weeks gestation

A) Blastocoele

B) Trophoblast

C) Embryoblast

D) Inner cell mass

E) Zona pellucid

36) How many days after fertilisation does implantation typically occur?

A) 1

B) 3

C) 5

D) 8

E) 12

37) What process changes a spermatogonium into a primary spermatocyte?

A) Meiosis 1

B) Meiosis 2

C) Differentiation

D) Maturation

E) Spermosis

38) The 7th cranial nerve develops from which pharyngeal arch?

A) 1st

B) 2nd

C) 3rd

D) 4th

E) 5th

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