top of page

Review

Use these practice questions to see how well you know the material!

Sperm.png

May 28

Cheesecake, figs, and pinot noir.

Question 4

Describe what is happening in an embryo at 4 weeks
of gestation.

Somatogenesis and neurulation.

Question 7

Which of the following structures is NOT present following gastrulation?
 

  1. Mesoderm

  2. Ectoderm

  3. Endoderm

  4. Hypoblast

The hypoblast is displaced by the epiblast during gastrulation.

Question 2

Which germ layers develop from the epiblast?

The epiblast gives rise to the three primary germ layers; ectoderm, definitive endoderm, and mesoderm and also to the extraembryonic mesoderm of the visceral yolk sac, the allantois, and the amnion.

Question 5

The process of gastrulation occurs during which week of development?

 

  1. Week 1

  2. Week 2

  3. Week 3

  4. Week 4

Gastrulation occurs during week 3.

Question 8

The primitive streak first appears at the beginning of the ___ week.
 

  1. First

  2. Second 

  3. Third 

  4. Fourth

  5. Fifth

Third week.

 

Gastrulation, the process of formation of the three germ layers, occurs during the third week. Epiblast cells form a thickening called the primitive streak, with a primitive knot or node located at its cranial end. Epiblast cells invaginate from this streak to form the mesoderm layer and to replace hypoblast with endoderm.

Question 3

Which anatomical structures would be affected if the development of somites
is disrupted?

The vertebrae and ribs, the dermis of the dorsal skin, the skeletal muscles of the back, and the skeletal muscles of the body wall and limbs.

Question 6

Which of the following arises from the mesoderm?

 

  1. The nervous system

  2. The primitive gut tube

  3. The liver

  4. The musculoskeletal system

The musculoskeletal system is derived from the mesoderm, the nervous system arises from ectoderm, and the liver and primitive gut tube originate from endoderm.

Question 9

Identify the correct association:

  1. Adrenal cortex - ectoderm

  2. Blood vessels of the stomach - endoderm

  3. Lung epithelium - mesoderm

  4. Olfactory epithelium - brain

  5. Liver parenchyma (functional cells) - endoderm

The correct answer is liver parenchyma (functional cells) - endoderm.

Of those structures mentioned, the adrenal cortex and blood vessels of the stomach are mesodermal. The lung epithelium and liver parenchyma are endodermal, and the olfactory epithelium is ectodermal.

Question 1

Which structure(s) derive from the same embryonic origin as the dorsal root (spinal) ganglia?

The adrenal medulla, pigment cells, Schwann cells, meninges (pia and arachnoid mater), pharyngeal arch cartilage, odontoblast, parafollicular (C) cells, aorticopulmonary septum, and endocardial cushions.

bottom of page