Question 1

________ Lower limb bud

Accepted Answer

The development of the lower limb bud occurs at the end of the fourth week of embryonic development. The other options are not related to the specific timing of lower limb development.

Question 2

________ Type of meromelia

Accepted Answer

Phocomelia is a type of meromelia where the proximal portion of the limb is relatively normal, but the distal portion, including the hand or foot, is reduced or absent.

Question 3

________ Invagination of pia mater

Accepted Answer

The answer of  ________ Invagination of pia mater
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Question 4

________ Sympathetic ganglion cells

Accepted Answer

Sympathetic ganglion cells originate from neural crest cells during embryonic development.

Question 5

________ Infundibulum

Accepted Answer

The structure depicted in the image is the infundibulum of the brain, which is part of the hypothalamus located above the pituitary gland. Choice D is the correct answer as it is the only option that corresponds to the location of the infundibulum. Choices A, B, C, and E are anatomical structures that are not related to the infundibulum.

Question 6

________ Efferent function

Accepted Answer

Basal plates are responsible for efferent function, or carrying information from the central nervous system to the periphery, such as motor function. The other choices are not directly involved in efferent function.

Question 7

________ Area of skin supplied by a spinal nerve

Accepted Answer

A dermatome is the area of skin supplied by a single spinal nerve.

Question 8

________ Roof of primordial mouth cavity

Accepted Answer

The answer of  ________ Roof of primordial mouth cavity
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Question 9

________ Gives rise to the pars nervosa

Accepted Answer

The structure shown in D is the neural tube, which gives rise to the entire nervous system including the pars nervosa.

Question 10

________ Absence of the limbs

Accepted Answer

Amelia refers to absence of a limb(s).This condition resulted when thalidomide was ingested by pregnant women early in the fourth week after fertilization.

Question 11

________ Lentiform nucleus

Accepted Answer

The answer of  ________ Lentiform nucleus
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Question 12

________ Form ventral gray columns

Accepted Answer

The basal plates of the neural tube give rise to the ventral gray columns, which contain motor neuron cell bodies responsible for controlling voluntary muscle movement.

Question 13

________ Third ventricle

Accepted Answer

The answer of  ________ Third ventricle
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Question 14

________ Primordium of adenohypophysis

Accepted Answer

The answer of  ________ Primordium of adenohypophysis
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Question 15

________ Unipolar afferent neurons

Accepted Answer

Unipolar afferent neurons are also known as dorsal root ganglion cells or spinal ganglion cells. They are found in the dorsal root ganglia of the spinal cord and have one long process that projects both to the periphery and towards the dorsal horn of the spinal cord. Therefore, the correct choice is E, spinal ganglion cells.

Question 16

________ Produces cerebrospinal fluid (CSF)

Accepted Answer

The answer of  ________ Produces cerebrospinal fluid (CSF)
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Question 17

________ Neuroglia

Accepted Answer

Some neuroepithelial cells of the neural tube differentiate into glioblasts (spongioblasts).These cells give rise to oligodendroblasts and astroblasts,which eventually become oligodendrocytes and astrocytes.Oligodendrocytes are concerned with the formation of myelin sheaths within the central nervous system,and astrocytes provide nutrition and general support to the developing neurons.The formation of glial cells continues into adult life.

Question 18

________ Hypothalamus

Accepted Answer

The answer of  ________ Hypothalamus
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Question 19

________ Gracile nuclei

Accepted Answer

The gracile and cuneate nuclei develop from neuroblasts that migrate from the alar plates into the marginal zone of the myelencephalon.These nuclei are associated with correspondingly named tracts that enter the medulla from the spinal cord.

Question 20

________ Internal capsule

Accepted Answer

The answer of  ________ Internal capsule
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Quiz 1: Gametogenesis and Fertilization