Term
|
Definition
| Develops in week 4 from a thickening of the surface ectoderm called the otic placode. |
|
|
Term
|
Definition
| divides into utricular and saccular portions. |
|
|
Term
|
Definition
| contains the sensory hair cells and otoliths of the macula utriculi. It responds to linear acceleration and force of gravity. |
|
|
Term
|
Definition
| contain the sensory hair cells of the cristae ampullares. respond to angular acceleration. |
|
|
Term
|
Definition
| CN VIII which lies at the base of the internal auditory meatus. |
|
|
Term
| Endolymphatic duct and sac |
|
Definition
| membranous canal connecting with the saccule and utricle and terminating in a blind dilation beneath the dura. absorbs endolymph. |
|
|
Term
| what portions rise from the utricular otic vesicle? |
|
Definition
| Utricle, Semiccircular Ducts, Vestibular ganglion, endolymphatic duct and sac |
|
|
Term
| What structures arise from the saccular portion of the otic vesicles? |
|
Definition
| Saccule, Cochlear Duct, spiral Ganglion |
|
|
Term
| Membranous and Bony Labyrinth |
|
Definition
| Membranous labyrinth, consists of all structures derived from otic vesicle. |
|
|
Term
|
Definition
| develops from cartilage of pharyngeal arch 1. Attached to tympanic membrane 2. Moved by the tympani muscle, which is innervated by CN V-3. |
|
|
Term
| What nerve innervates the tympani muscle? |
|
Definition
|
|
Term
|
Definition
| develops from the cartilage of pharyngeal arch 1. articulates with the malleus and stapes. |
|
|
Term
|
Definition
| develops from the cartilage of pharyngeal arch 2. moved by the stapedius muscle, which is innervated by CN VII. attached to the oval window of the vestibule. |
|
|
Term
| Auditory tube and middle ear cavity |
|
Definition
| develops from the pharyngeal pouch 1. |
|
|
Term
|
Definition
| develops from pharyngeal membrane 1. separates the middle ear from the external auditory meatus of the external ear. CNV-3 CN IX. |
|
|
Term
|
Definition
| develops from six auricular hillocks that surround pharyngeal groove 1. innervated CNV-3, CNVII, CN IX, and CNX, and cervical nerves C-2, and C-3 |
|
|
Term
|
Definition
| organ of corti may be damaged by exposure to rubella virus, especially during week 7 and week 8 of development. |
|
|
Term
| Malformation of the Auricles in chromosomal syndromes |
|
Definition
| seen in Down Syndrome, Patau syndrome, and edwards syndrome. |
|
|
Term
| Atresia of External Auditory Meatus |
|
Definition
| results from failure of the meatal to canalize; this is condition deafness and is usually associated with the first arch syndrome. |
|
|
Term
|
Definition
| frequent cause of conduction deafness. benign tumor found in the tympanic cavity; is thought to develop from epidermoid thickenings of endodermal lining. |
|
|
Term
| What does the outer layer of the optic cup give rise to? |
|
Definition
| It gives rise to the pigment layer of the retina! |
|
|
Term
| What structure begins the formation of the eye? |
|
Definition
| Optic sulcus, evaginates from the wall of the diencephalon as the optic vesicle consisting of neuroectoderm. |
|
|
Term
|
Definition
| separates the pigment layer of the retina from teh neural layer of the retina. becomes a potential space. common site of retinal detachment. |
|
|
Term
| Inner neural layer of the optic cup |
|
Definition
| gives rise to the neural layer of the retina. (rods and cones, bipolar cells, and ganglion cells) |
|
|
Term
| What virus can cause permanent damage to the developing ear resulting in congenital deafness? |
|
Definition
|
|
Term
| What sensory hair cells are located in the semicircular canal |
|
Definition
|
|
Term
|
Definition
| develops from the other portions of both the outer pigment layer. stroma develops from mesoderm continuous with choroid. contains pupillae muscle and sphincter pupillae muscle. |
|
|
Term
| What structure do the stroma develop from in the eye? |
|
Definition
| They develop from the mesoderm which is continuous with the choroid. |
|
|
Term
|
Definition
| cleft in iris caused by failure of choroid fissure to close in week 7 of development. may extend into the ci99liary body, retina, choroiidd, or optic nerve |
|
|
Term
| Persistent Iridopupillary Membrane |
|
Definition
| consists of strands of connective tissue that partially cover the pupil; seldom affects vision. |
|
|
Term
|
Definition
| are opacities of the lens, usually bilateral. common and may result from following: rubella virus infection, congenital syphilis, down syndrome, galactosemia |
|
|
Term
| what are the possible causes of congenital cataracts? |
|
Definition
| rubella virus infection, congenital syphilis, down syndrome, galactosemia. |
|
|
Term
| Congenital Glaucoma symptoms |
|
Definition
| photophobia, epiphora, blepharospasm |
|
|
Term
| What is the usual treatment of congenital glaucoma? |
|
Definition
|
|
Term
|
Definition
| small eye, usually associated with intrauterine infections from the TORCH group of Toxoplasma, Rubella virus, Cytomeggalovirus, and herpes simplex virus. |
|
|
Term
|
Definition
| absence of eye due to failure of the optic vesicle to form. |
|
|
Term
|
Definition
| single orbit and one eye. due to failure of median cerebral structures to develop. |
|
|
Term
|
Definition
| herniation of retina into the sclera. rsults from failure of the choroid fissure to close. |
|
|
Term
|
Definition
| oxygen-induced retinopathy seen in premature infants. |
|
|
Term
|
Definition
| edema of optic disk due to increased intracranial pressure reflected into subarachnoid space. |
|
|
Term
|
Definition
| hereditary degeneration and atrophy of retina. night blindness |
|
|
