Deck 16: Eye and Ear

Question 1

________ External acoustic meatus

A)Conjunctival epithelium
B)Neuroectoderm
C)First pharyngeal pouch
D)First pharyngeal groove
E)Mesenchyme

Answer 1

D
The external acoustic meatus is the adult derivative of the dorsal part of the first pharyngeal groove.It grows inward as a funnel-shaped tube until it reaches the endodermal tubotympanic recess,primordium of the tympanic cavity,tympanic antrum,pharyngotympanic (auditory)tube,and mastoid cells.

Question 2

________ Congenital glaucoma

A)Scleral venous sinus
B)Optic nerve
C)Corneal epithelium
D)Central artery of retina
E)Pupillary membrane

Answer 2

A
Absence or incomplete development of the scleral venous sinus results in congenital glaucoma or buphthalmos.This abnormality usually is caused by recessive mutant genes,but sometimes it results from a maternal rubella infection during early pregnancy.The embryological basis of blockage or incomplete development of the scleral venous sinus is abnormal persistence of mesenchymal tissue in the angle of the anterior chamber.As a result of inadequate drainage of the aqueous humor through the canal,intraocular tension rises,the eye gradually enlarges,and the cornea becomes hazy.Retinal damage causes visual impairment.

Question 3

________ Gives rise to the spiral organ

A)A
B)B
C)C
D)D
E)E

Answer 3

A
The spiral organ (of Corti)differentiates from cells in the wall of the cochlear duct.Ganglion cells of the eighth cranial nerve migrate along the coils of the cochlea and form the cochlear ganglion.Nerve processes grow from this ganglion to the spiral organ.

Question 4

________ Primordium of the cochlea

A)A
B)B
C)C
D)D
E)E

Question 5

________ Saccular part of the otic vesicle

A)A
B)B
C)C
D)D
E)E

Question 6

________ Becomes specialized for sensitivity to light

A)A
B)B
C)C
D)D
E)E

Question 7

________ Neuroectoderm

A)Scleral venous sinus
B)Optic nerve
C)Corneal epithelium
D)Central artery of retina
E)Pupillary membrane

Question 8

________ Future optic nerve

A)A
B)B
C)C
D)D
E)E

Question 9

________ Sclera and choroid

A)Conjunctival epithelium
B)Neuroectoderm
C)First pharyngeal pouch
D)First pharyngeal groove
E)Mesenchyme

Question 10

________ Ganglion cells of retina

A)Scleral venous sinus
B)Optic nerve
C)Corneal epithelium
D)Central artery of retina
E)Pupillary membrane

Question 11

________ Hyaloid artery

A)Scleral venous sinus
B)Optic nerve
C)Corneal epithelium
D)Central artery of retina
E)Pupillary membrane

Question 12

________ Absorption focus

A)A
B)B
C)C
D)D
E)E

Question 13

________ Endolymphatic duct

A)A
B)B
C)C
D)D
E)E

Question 14

________ Gives rise to a semicircular duct

A)A
B)B
C)C
D)D
E)E

Question 15

________ Differentiates into the nonpigmented portion of the ciliary epithelium

A)A
B)B
C)C
D)D
E)E

Question 16

________ Tunica vasculosa lentis

A)Scleral venous sinus
B)Optic nerve
C)Corneal epithelium
D)Central artery of retina
E)Pupillary membrane

Question 17

________ Retinal fissure

A)A
B)B
C)C
D)D
E)E

Question 18

________ Surface ectoderm

A)Scleral venous sinus
B)Optic nerve
C)Corneal epithelium
D)Central artery of retina
E)Pupillary membrane

Question 19

________ Gives rise to the lens

A)A
B)B
C)C
D)D
E)E

Question 20

________ Becomes the pigmented layer of the retina

A)A
B)B
C)C
D)D
E)E

Question 21

________ Tympanic cavity

A)Conjunctival epithelium
B)Neuroectoderm
C)First pharyngeal pouch
D)First pharyngeal groove
E)Mesenchyme

Question 22

________ Ciliary body

A)A
B)B
C)C
D)D
E)E

Question 23

________ Develops from mesenchyme

A)A
B)B
C)C
D)D
E)E

Question 24

________ Hyaloid vessels

A)A
B)B
C)C
D)D
E)E

Question 25

________ Mastoid cells

A)Conjunctival epithelium
B)Neuroectoderm
C)First pharyngeal pouch
D)First pharyngeal groove
E)Mesenchyme

Question 26

________ Bipolar cells of the retina

A)Conjunctival epithelium
B)Neuroectoderm
C)First pharyngeal pouch
D)First pharyngeal groove
E)Mesenchyme

Question 27

________ Derived from the first pharyngeal arch cartilage

A)A
B)B
C)C
D)D
E)E

Question 28

________ External acoustic meatus

A)A
B)B
C)C
D)D
E)E

Question 29

________ Contains axons of ganglion cells

A)A
B)B
C)C
D)D
E)E

Question 30

________ Gives rise to the utricle

A)A
B)B
C)C
D)D
E)E

Question 31

________ Derived from the tubotympanic recess

A)A
B)B
C)C
D)D
E)E

Question 32

________ Continuous with the pigmented epithelium of the retina

A)A
B)B
C)C
D)D
E)E

Question 33

________ Membranous labyrinth

A)A
B)B
C)C
D)D
E)E

Question 34

________ Only derived from surface ectoderm

A)A
B)B
C)C
D)D
E)E

Question 35

________ Has same origin as the cornea

A)Conjunctival epithelium
B)Neuroectoderm
C)First pharyngeal pouch
D)First pharyngeal groove
E)Mesenchyme

Question 36

________ Meatal plug

A)A
B)B
C)C
D)D
E)E

Question 37

________ Continuous with the cranial meninges

A)A
B)B
C)C
D)D
E)E

Question 38

________ Gradually obliterates

A)A
B)B
C)C
D)D
E)E

Question 39

________ Continuous with the neural layer of the retina

A)A
B)B
C)C
D)D
E)E

Question 40

________ Composed of vitreous humor

A)A
B)B
C)C
D)D
E)E

Question 41

________ Cornea

A)A
B)B
C)C
D)D
E)E