Deck 13: Sense Organs

Question 1

The muscles of the sphincter and dilator pupillae arise from the _________________.

A)Mesoderm
B)Neural crest
C)Neurectoderm
D)Pharyngeal arches
E)Endoderm

Answer 1

C

Question 2

The otic placode is induced by the ______________.

A)Notochord
B)Second pharyngeal arch
C)Rhombencephalon
D)Primitive node
E)None of the above

Answer 2

C

Question 3

Coloboma is a structural abnormality of the _____________.

A)Retina
B)First pharyngeal arch
C)Tympanic membrane
D)Iris
E)Second pharyngeal arch

Answer 3

D

Question 4

Sensory placodes arise from the _____________.

A)Neural crest
B)Lateral plate mesoderm
C)Lateral ectoderm
D)Neural tube
E)None of the above

Question 5

The development of corneal transparency by removal of water from the secondary stroma is mediated by ____________.

A)Thyroxine
B)Catecholamines
C)Fibroblast growth factor
D)Nerve growth factor
E)Crystallins

Question 6

Coloboma is typically seen in individuals with mutants of ____________.

A)Pax-2
B)En-1
C)Sonic hedgehog
D)Pax-6
E)En-2

Question 7

Which of the following associations is incorrect?

A)Optic cup - neural retina
B)Neural crest - sphincter/dilator papillae muscles
C)Ectodermal placode - lens
D)Neural crest - pigment layer of the retina
E)Neural crest - corneal endothelium

Question 8

Which of the following associations is incorrect?

A)Diencephalon - neural retina
B)Optic cup - pigment layer of retina
C)Surface ectoderm - lens
D)Surface ectoderm - iris
E)Surface ectoderm - cornea

Question 9

Surface ectoderm is induced to become corneal epithelium by an inductive event originating in the _____________.

A)Optic cup
B)Chordamesoderm
C)Optic vesicle
D)Lens vesicle
E)Primitive neural retina

Question 10

The sensory hair cells of the inner ear originate from the _________________.

A)Pinna
B)Otic placode
C)Neural crest
D)Pharyngeal arch
E)Prosencephalon

Question 11

The otic placode is induced by interaction of the surface ectoderm with ____________.

A)Prosencephalon
B)Mesencephalon
C)Rhombencephalon
D)Cephalic mesoderm
E)Spiral ganglion

Question 12

Neural crest-derived cells constitute a significant component of which of the following tissues of the eye?

A)Neural retina
B)Lens
C)Optic nerve
D)Cornea
E)None of the above

Question 13

Which embryonic tissue contains mesoderm?

A)Oropharyngeal membrane
B)Tympanic membrane
C)Proctodeal membrane
D)Lens
E)None of the above

Question 14

Coloboma results from _________________.

A)Nonclosure of the choroid fissure of the iris
B)Lack of induction by the lens
C)Lack of induction by the otic vesicle
D)Hypoplasia of the first pharyngeal arch
E)Incomplete migration of fourth pharyngeal pouch endoderm

Question 15

Which of the following associations is incorrect?

A)Diencephalon - neural retina
B)Optic cup - pigment layer of retina
C)Surface ectoderm - lens
D)Surface ectoderm - iris
E)Surface ectoderm - cornea

Question 16

The epithelial lining of the middle ear cavity and auditory tube arises from the ________________.

A)Pharyngeal endoderm
B)Neural crest
C)Otic placode
D)Paraxial mesoderm
E)Otocyst

Question 17

The _______________ gives rise to tissues of the external ear.

A)Maxillary process
B)Nasolateral process
C)Pharyngeal arch 3
D)Philtrum
E)None of the above