lect 14- Eye and Ear

Question 1

what are the 2 segments of the eye defined by

Answer 1

Anterior border of vitreous body

Question 2

what forms the lens placode

Answer 2

epithelium over the optic vesicles thickening

Question 3

what does the optic vesicle invaginate to form

Answer 3

optic cup

Question 4

what connects the optic vesicle to the diencephalon

Answer 4

fissured optic stalk

Question 5

what does the inner wall of the optic cup become

Answer 5

neural retina

Question 6

what does the outer wall of the optic cup become

Answer 6

pigment epithelium

Question 7

what is the initial blood supply to the optic cup

Answer 7

hyaloid artery

Question 8

what is the site of retinal detachments even though it is lost in adults

Answer 8

intraretinal space

Question 9

what are the 3 types of cones

Answer 9

red, green, blue

Question 10

what cells of the retina develop first

Answer 10

ganglion cells

Question 11

what connects the ciliary muscle to the lens

Answer 11

suspensory fibers

Question 12

what is the condition in which there are missing pieces of structures of the eye

Answer 12

colobomas

Question 13

what is the cause of colobomas

Answer 13

retinal/choroid fissure not closing

Question 14

what condition occurs when the iris has a keyhole appearance

Answer 14

coloboma iridis

Question 15

what disorder of the eye has a mutation in PAX2

Answer 15

renal coloboma syndrome

Question 16

what is the embryonic tissue of the retina

Answer 16

outer and inner layer of optic cup

Question 17

what is the embryonic tissue of the iris and ciliary body lining

Answer 17

outer and inner layer of optic cup

Question 18

what is the embryonic tissue of the iris and ciliary body (stroma), dilator and constrictor muscle

Answer 18

mesenchyme

Question 19

what is the embryonic tissue of the choroid

Answer 19

mesenchyme

Question 20

what is the embryonic tissue of the sclera

Answer 20

mesenchyme

Question 21

what is the embryonic tissue of the lens

Answer 21

surface ectoderm

Question 22

what is the embryonic tissue of the cornea (anterior epithelium)

Answer 22

surface ectoderm

Question 23

what is the embryonic tissue of the cornea (dense connective tissue and corneal endothelium)

Answer 23

mesenchyme

Question 24

what is the embryonic tissue of the vitreous body

Answer 24

mesenchyme

Question 25

what is the embryonic tissue of the eyelid

Answer 25

surface ectoderm (folds) with core mesenchyme

Question 26

what are the adult derivates of the utricle

Answer 26

sensory hair cells and otolith

Question 27

what is the adult derivative of semicircular ducts

Answer 27

sensory hairs of cristae ampullaris

Question 28

what does the cristae ampullaris detect

Answer 28

Angular acceleration

Question 29

what is the adult derivative of the vestibular ganglia

Answer 29

CN VIII

Question 30

what detects linear acceleration and gravity

Answer 30

saccule

Question 31

what pharyngeal arches doe the external ear develop from

Answer 31

arch 1 and 2

Question 32

what is the external ear innervated by

Answer 32

CN V3 and CN IX

Question 33

what cartilage does the malleus and incus develop from

Answer 33

meckel’s cartilage

Question 34

what cartilage does the stapes develop from

Answer 34

reichert’s cartilage

Question 35

what is the embryonic precursor for bony labyrinth

Answer 35

mesenchyme surrounding membraneous labyrinth

Question 36

what is the embryonic precursor for membraneous labyrinth

Answer 36

surface ectoderm

Question 37

what is the embryonic precursor for the tympanic cavity

Answer 37

first pharyngeal arch

Question 38

what is the precursor of the tympanic membrane

Answer 38

ectoderm of first pharyngeal cleft, endoderm of first pharyngeal pouch and intervening mesenchyme

Question 39

what is the precursor for the external auditory meatus

Answer 39

first pharyngeal cleft

Question 40

what is the precursor for the auricle (external ear)

Answer 40

first pharyngeal arch (anterior) and 2nd pharyngeal arch (posterior)