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Organogenesis > 8 > Flashcards

8 Flashcards

1
Q

is a complex organ, with parts derived from ectoderm and mesoderm in the head
region.

A

Eye

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2
Q

wall, anterior compartment, posterior compartment and lens.

A

Eyeball

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3
Q

intrinsic and extrinsic muscles.

A

Muscles of the eye

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4
Q

The wall of the eye consists of three layers or tunics:

A

a. Fibrous tunic - cornea and sclera
b. Vascular tunic - choroid, ciliary body and ciliary processes and iris
c. Nervous tunic - retina

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5
Q

cornea and sclera

A

Fibrous tunic

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6
Q

choroid, ciliary body and ciliary processes and iris

A

Vascular tunic

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7
Q

retina

A

Nervous tunic

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8
Q

The anterior compartment is composed of

A

anterior and posterior chambers that contain
aqueous humor.

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9
Q

The posterior compartment consists of the

A

vitreous chamber that contains vitreous
humor.

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10
Q

Both eyes develop from the

A

Optic field

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11
Q

by induction from the optic vesicles and placode
formation, thickens to form the

A

Lens placode

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12
Q

cells in the deep or inner pole of the lens elongate to form

A

Lens fibers

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13
Q

Cells in the outer or superficial pole of
the lens form a single layer of cuboidal or columnar epithelium called

A

Lens epithelium

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14
Q

The lens
fibers and lens epithelium produce lens proteins called

A

Crystallins

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15
Q

later on the corneal endothelial cells secrete

A

Hyaluronic acid

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16
Q

That destros the hyaluronic acid

A

hyaluronidase

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17
Q

is the reduced opening of the optic cup

A

Pupil

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18
Q

is derived from the thickened choroid
ectomesenchyme and caudal part of the overlapping portion of the optic cup.

A

Ciliary apparatus

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19
Q

Sorrounding the optic cup

A

Ectomesenchymal cells

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20
Q

which differentiates into the inner vascular later of the
wall called

A

choroid

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21
Q

outer fibrous layer called

A

sclera

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22
Q

In chick, 14 bony rings called

A

sclera ossicles

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23
Q

surround the outer margin
of the cornea.

A

Sclera ossicles

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24
Q

Formed by upper and lower folds of ectoderm (skin), each fold includes a mesenchyme
core.

A

Eyelids

25
Q

Derived from the space between the eyelid and the cornea.

A

Conjunctival Sac

26
Q

Develops by invagination and budding of conjunctival ectoderm

A

Lacrimal Gland

27
Q

Optic vesicle of Dog and Cow

A

17 days of gestation
25- 30 days of gestation

28
Q

Optic cup of Dog and Cow

A

19 days of gestation
30 days of gestation

29
Q

Lens vesicle of Dog and Cow

A

25 days of gestation and 30 days of gestation

30
Q

Fused eyelids of Dog and Cow

A

33 days of gestation and 50 days of gestation

31
Q

Opening of eyelids of Dog and Cow

A

14 days after birth and At birth

32
Q

Rods and cornea of retina of Dogs and Cow

A

16-35 days after birth and 150-180 days of gestation

33
Q

development of a single eye in the center of the head due to failure of the optic
field to separate into 2 lateral eye-forming regions

A

Cyclopia

34
Q

absence of eye due to failure of optic vesicles to form or to severe inference
w/ normal growth of optic cup.

A

Anophthalmia

35
Q

a defect due to failure of the optic fissure to close.

A

Coloboma

36
Q

small undeveloped eye; results from failure of the vitreous body to exert
sufficient pressure for growth, often because a coloboma allowed vitreous humor to escape.
Due to Vit. A deficiency in the mother. Common in pig, dog and cattle.

A

Microphthalmia

37
Q

medial deviation of the eyeball. Common in Siamese Cat

A

Medial strabismus -

38
Q

contains sense organs for hearing (cochlea) and detecting
head acceleration (vestibular apparatus or vesticule), the latter is important in
balance. Innervated by the cochlear and vestibular divisions of cranial nerve VIII.

A

Inner or Internal Ear

39
Q

contains bones (ossicles) that convey vibrations from the tympanic
membrane (ear drum) to the inner ear.

A

Middle Ear

40
Q

channels sound waves to the tympanic membrane.

A

Outer or External Ear

41
Q

_______of incubation in chick embryo, the surface ectoderm overlying the
dorsolateral wall of myelencephalon by___________

A

35hrs
Placode formation

42
Q

of incubation, the otic placodes invaginate to form auditory pits

A

38hrs

43
Q

of incubation the otic cup closes and separates from
the ectoderm (vesicle formation) forming an otic vesicle (otocyst)

A

50hrs

44
Q

consists of the tympanic membrane, tympanic cavity, auditory
ossicles and auditory tube or Eustachian tube.

A

Middle ear

45
Q

The external ear canal develops from the

A

1st branchial groove

46
Q

flanking the 1st branchial groove expand laterally to form the
wall of the canal.

A

VA 1 and VA 2

47
Q

is composed of the nasal cavity, alae or wings, bridge, nostrils or anterior
nares, choanae or posterior nares, nasal septum and nasolacrimal duct.

A

Nose

48
Q

is the part of the nose that contains the nasal conchae.

A

nasal cavity

49
Q

It is divided into
right and left chambers by the

A

Nasal septum

50
Q

is derived from VA 1 and VA 2

A

Pinna

51
Q

Anterior opening of nasal pit

A

anterior nares

52
Q

Posterior opening of nasal pit

A

posterior nares

53
Q

in the midline cephalic to the stomodaeum gives off
ectomesenchyme cell to areas between the nasal pits to form the frontal prominence

A

Frontonasal mesenchyme

54
Q

That develops into the bridge of the nose

A

Frontal prominence

55
Q

Becomes the nose wings

A

Lateral nasal processes

56
Q

Right and left medial nasal processes fuse w/ the maxillary processes of the right and left
visceral arches 1 to form the

A

Nasal septum

57
Q

between the lateral nasal process and the maxillary process of the visceral
arch 1 deepens to form the nasolacrimal groove.

A

Depression

58
Q

are groups of specialized (chemoreceptive) epithelial cells localized
principally on the papillae of the tongue.

A

Taste Buds

59
Q

Innervate the taste buds

A

Cranial nerve VII and IX

Organogenesis (4 decks)

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