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58 Cards in this Set

  • Front
  • Back
What are the two origins of the eye
Neural Ectoderm
Surface Ectoderm
The Optic stalk develops into what strucutre
Optic Nerve
The Optic Vesicle Develops into _____ which develops into the______.
Optic Cup --- Retina
The Optic Cup and the Optic Stalk origicate from the _____
Optic Sculus
The ______ is induced into the Optic Sculus.
Diencephelon
The Lens vesicle forms?
The lens
The Corneal Placode forms?
The cornea
The Surface exctoderm forms the ___ and the _____.
Lens Placode ---- Corneal Placode
The _____ is induced into the Lens Placode
Optic Vesicle
The _____ is induced into the corneal Placode
Lens vesicle
Anophtalmia is ______ and its causes are ____ and _____
a. very small or absent eye
b. genetic causes -- eye inv. only
c. forbrain defects, other structures are involvecd
The Optic Cup develops into the _____
Retina
The outer layer of the optic cup forms the _____
Pigmented epithelium
The inner layer of the optic cup forms the _____
Retina
Congenital Detachment of th Retina
inner and outer layers of the optic cup do not close
The Optic Vesicle forms the ____ which forms the _____ with forms the lens.
Lens placode --- lens vesicle
The posterior section of the lens becomes ____ while the anterior section of the lens becomes
a. lens fibers
b. epthelium
The result of interference with lens development is ?
a congenital cateract.
The lens vesicle differentiates into the _____ which develops into the ______
a. corneal placode
b. cornea
Aside from the contributions of the surface ectoderm so the cornea, ______ also participates
a. neural crest cells
The choroid (neural crest in origin) is continuous with the ____ posteriorly
arachnoid and pia mater
the Sclera ( neural crest in origin) is continuous with the ____ posteriorly
dura mater
The eyelids form from the ___ and the ___
frontal processes and maxillary processes
The lacrimal apparatus are from...
from ectoderm
the extraocular msucles are from ...
paraxial mesoderm of the somitomeres... they attach to the sclera
The Vitreous body is a derivative of...
mesoderm
the primary vitreous body is supplied by
hyaloid artery
the secondary vitreous bod is supplied by...
nothing, it is avascular
Congenital Glaucoma
is the abnormal developmet of fulid draining systems from the internal part of the eye
What are the two sources of vascularization to the developing eye?
1. Hyaloid Arteries (branches of the opthalmic)
2. Choroid Vessels
Persistent Pupolary Membrane
hyaloid vessels that remain in from of the lens and should have disappeared in the 3rd trimester... can cover the pupil
Coloboma
failure of Choroid fissure to close
Congenital Ptosis
failure to form the levator palebrae muscle
Micropthalmia
small eyeball
- if the insult occurs before wk 4 there will be functional problems
- if the insult occurs after week 8, you will have a small but normally functioning eyeball
Surface Ectoderm Derivatives ( 4)
1. cornea
2. lens
3. conjunctiva epithelium
4. lacrimal gland
Mesoderm (6)
1. extrinsic occular
2. vascular endothelium
3. vitreous body
4. fluid draining spaces/ vessels
5. orbital soft tissue
6. iris stroma
Nerural Ectocderm forms ___ and ____
Optic Cup inner layer
Optic Cup Outer Layer
Optic Cup -- Inner Layer (3)
1.Sensory Retina ( 2-9)
2. Cillary Body
3. Iris
Optic Cup -- Outer Layer ( 3)
1. Pigmented Retina ( 1)
2. cilliary body
3. Iris
Neural Crest Cells ( 6)
1. spincter and dilatory pupillae muscles
2. cillary mucle
3. sclera
4. choroid
5. pigment cells
6. cornea
The middl ear, inner ear and bony portion of the external auditory meatus are part of ____
The temporal bone
The Petromastoid is derived from ___ and undergoes ___ ossification
Otic Capsule , EC
The Sytloid Process is derived from ___ and undergoes ___ ossification
Arch 2, EC
The Squamous is derived from ___ and undergoes ___ ossification
Arch I , IM
the Tympanic is derived from ___ and undergoes ___ ossification
Arch I, IM
The auricle is derived from the _____
aruicular hillocks which are derivatives of the 1st and 2nd pharengeal arch
What are the two parts of the external auditory meatus and what are thier derivations?
1. Cartilagenous Portion -- 1st pharengeal cleft
2. Osseus Portion -- Meatal lug
The two parts of the external ear are ____ and _____.
1. auricle
2. external auditory meatus
The two parts of the middle ear are ?
1. tympanic membrane
2. ossicles
The Tympanic Caivty is formed fron ?
the first pouch
What are the three layers of the Tympanic membrane ( first closing plate) and what are their origins??
Endoderm -- 1st pouch
Arch Mesenchyme -- NC
Ectoderm -- 1st cleft
The _____ developes into the (Otic Placode the Otic Pit ) Otic Vesicle which develops into ___ and _____
Rhombencephelon
CN8 and Membranous Labryunth
The dorsal portion of the Otic Vesicle is the ____
Utricle (semiciruclar canals/ crista ampullaris)
the ventral portion of the Otic Vesicle is the _____
Saccule ( cochlea and organ of Corti)
otocephally
low set ears, bc the auricles did not move superiolaterally
Cholesteatoma
begin growth of endoderm w/in tympanic cavity
Congenital Hearing loss - 60%
either a problem of conduction or sensorinural (cant intperet vibration... either inner ear of CN 8)
what accounts for 30% of congenital hearing loss
prenatal infections and environment