Biology NEET - XI: Chapter 21- Neural Control Part 3
The medial rectus is one of the six extraocular muscles responsible for eye movement. It controls the inward (medial) movement of the eyeball, allowing the eye to turn toward the nose. This muscle is innervated by the oculomotor nerve (cranial nerve III).
Which muscle of eye helps in inward movement?
Medial rectus
Key Terms
Which muscle of eye helps in inward movement?
Medial rectus
Which muscle of eye helps in outward movement?
Lateral rectus
Name the glands present in eyelids.
Meibomian gland
Gland of Zeis
Gland of Moll
Which is the first refractive surface of eye?
Cornea
Is cornea supplied with blood vessels?
No
cornea receive glucose from
Aqueous humour
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| Term | Definition |
|---|---|
Which muscle of eye helps in inward movement? | Medial rectus |
Which muscle of eye helps in outward movement? | Lateral rectus |
Name the glands present in eyelids. | Meibomian gland Gland of Zeis Gland of Moll |
Which is the first refractive surface of eye? | Cornea |
Is cornea supplied with blood vessels? | No |
cornea receive glucose from | Aqueous humour |
Which layer provides nourishment to retina? | Choroid |
Is choroid supplied with blood vessel? | Yes |
Which forms the second refractory surface of eye? | Lens |
Aqueous chamber of eye is present between | Cornea and lens |
Aqueous chamber of eye drains into venous circulation through which structure? | Canal of schleim |
How mant sublayers does retina have? Name them | 4 Pigment layer Photosensitive layer Bipolar neuron layer Retinal ganglionic layer |
Horizontal cells in eye are present between | Photosensitive cells and bipolar neuron layer |
Amacrine cells in eye are present between | Bipolar neuron and ganglionic layer |
Which cells are more abundant- rods or cones? | Rods |
Which pigment is present in rods? | Rhodoposin |
Which cells of eye provide scotopic vision? | Rod cells |
Which pigment is present in cones? | Iodopsin |
Visual purple is the other name for | Rhodopsin |
Visual violet is the other name of | Iodopsin |
Rhodopsin is made of | Retinal + opsin |
What is macula lutea? | Area on retina just opposite to lens where only cones are present |
In which part of retina is the sharpest image formed? | Macula lutea |
What is fovea centralis? | Depression in macula lutea |
Myopia is also known as | Near sightedness |
Myopia is caused by | Increasing converging power of lens or decreased size of eyeball |
Myopia can be corrected by using which lens? | Concave lens |
Hypermetropia is also called | Far sightedness |
Hypermetropia is caused due to | Decreasing convergence of lens or smaller eyeball |
Hypermetropia is corrected by which lens? | Convex lens |
Ear ossicles are present in which part of ear? | Middle ear |
Which part of external ear has ceruminous glands? | External auditory meatus |
Tympanum is made of which tissue? | Connective tissue |
Tympanic cavity is filled with which fluid? | Air |
Stapes connects to | Incus and oval window |
Which joint is present between malleus and incus? | Saddle joint |
Which joint is present between malleus and incus? | Saddle joint |
Which joint is present between incus and stapes/ | Ball and socket joint |
Eustachian tube extends from inner ear to pharynx. True/false? | False | Eustachian tube extends from middle ear to pharynx. |
What is the function of vestibular apparatus of ear? | Maintaining body balance |
What is the sensitive structure of utriculus and saculus? | Macule (2) |
What is the sensitive structure of semicircular canals? | Cristae |
Scala vestibuli is filled with | Perilymph |
Scala media of cochlea is filled with | Endolymph |
Scala tympani is filled with | Perilymph |
Which part of cochlea is connected to the oval window? | Scala vestibuli |
Which part of cochlea contains organ of corti? | Scala media |
Which part of cochlea is connected to round window? | Scala tympani |
What are otolith crystals? | Calcareous crystals on top of gelatinous layer in macula. Responsible for maintenance of static pressure. |
What is responsible for dynamic equilibrium of body? | Semicircular canal |
Otolith crystals are found in which part of ear? | Macula |
Organ of corti is present on which membrane of cochlea? | Basilar membrane |
What is the function of somatic nervous system? | Transfers impulse from skeletal muscles to CNS |
What is the function of autonomous nervous system? | Transfers impulse from CNS to involuntary muscles |
What is the layer of cells which covers the cerebral hemisphere called? | Cerebral cortex |
Cerebellum has fibre tracts that interconnect different regions of brain. True/false? | False. | Cerebellum has very convoluted surface while pons has fibre tracts that interconnect different regions of brain. |
What is the external layer of eye composed of and what is it called? | Dense connective tissue, sclera |
What is the colour of choroid? | Blue |
How does choroid vary over the eyeball? | Thin over the posterior two thirds but becomes thick around anterior region to form the ciliary body |
Tectorial membrane is a thin elastic membrane, true or false? | True |