Ch. 15 Vocab Flashcards
Eye
Wall of eye includes fibrous sensory and vascular layers
Special sensory receptors
Large complex sensory organs( eyes and ears) or localized clusters of receptors(taste buds and olfactory epithelium)
Accessory structures of the eye
Eyebrows, eyelids, conjuctiva, lacrimal apparatus,eccentric eye muscles
Conjunctiva
- mucous membrane
- lines the internal service of the eyelids and continues over the anterior surface of the eyeball to the outer edge of the cornea where it fuses with the corneal epithelium
Lacrimal apparatus
Lacrimal glands-release a dilute salt solution(tears) onto another surface of the eyeball
System of ducts
Lysozyme
A substance in tears
Extrinsic eye muscles
Lateral rectus;medial rectus; superior rectus;inferior rectus; inferior oblique; superior oblique
Sclera
The opaque posterior region of the fibrous layer/the white of the eye
Cornea
Transparent anterior 1/6 of fibrous layer
Choroid
Posterior portion of the Uvea
Ciliary body
Ring of tissue surrounding the lens
Ciliary zonule
Suspended ligament that holds lens in position
Iris
The colored part of the eye
Pupil
central opening that regulates the amount of light entering the eye
Retina
Delicate two laye mebrane
Photoreceptors
Transducers light energy
Bipolar cells
A cell that transmits and processes signals
Ganglion cells
Cells that transmit and process signals:
Optic disc(blind spot)
Site where the optic nerve leaves the eye
Lacks photoreceptors
Rods
Photoreceptors that operate in dim light
Cones
Photoreceptors that operate I bright light
Macula lutea
Where cones are located
Fovea centralis
Where cones are concentrated
Vitreous humor
Included in the posterior segment of the internal chambers and fluids
Scleral venous sinus
The internal chambers and fluids drains via the scleral venous sinus (canal of Schlemm) at the sclera-cornea junction
Lens
Allows precise focusing of light on the retina
Photons
Packets of energy
Visible spectrum
The light our eyes can see
Reflection
The light reflecting
Refraction
Bending of a light ray due to change in speed when light passes from one transparent medium to another
Focal point
Where light is focused in our eyes
Emmetropic
Normal
Accommodation
changing the lens shape by ciliary muscles to increase refractory power
Presbyopia
loss of accommodation over age 50
Rhodopsin
accumulates in the dark and retinal sensitivity increases within 20–30 minutes
Light adaptation
Occurs when moving from darkness into light
Dark adaptation
Happen when moving from light to dark
Optic chiasma
Medial fibers of the optic nerve decussate at the optic chiasma
Depth perception
Both eyes view the same image from slightly different angles
Chemoreceptors
Are in taste and smell
Olfactory epithelium
Part of the nose
Taste buds
Receptor organs
Papillae
Taste buds ate on top of these
Gustatory taste cells
Epithelial cells in the taste buds
Umami taste
Savory;amino acids glutamate and aspartate
Auricle (pinna)
Part of the external ear
External acoustic meatus
Short, curved tube lined with skin bearing hairs, sebaceous glands, and ceruminous glands
Tympanic membrane
Eardrum
Middle ear
A small, air-filled, mucosa-lined cavity in the temporal bone
Vestibular(oval) window
Contained in bony wall of the ear
Cochlear round ear
Contained in buy wall f the ear
Auditory tube
Connects the middle ear to the nasopharynx
Malleus
Hammer,
Incus
Avil
Staples
Stirrup
Inner ear
Bony labyrinth,filled with perilymph
Bony labyrinth
Torturous channels in the temporal lobe
Endolymph
In perilymph
Vestibule
Central egg-shaped cavity of the bony labyrinth
Utricle
Utricle is continuous with the semicircular canals
Semicircular canals
Three canals (anterior, lateral, and posterior) that each define two-thirds of a circle
Ampulla
Ampulla of each canal houses equilibrium receptor region called the crista ampullaris
Cochlear
A spiral, conical, bony chamber
Vestibular membrane
Vestibular apparatus consists of the equilibrium receptors in the semicircular canals and vestibule
Basilar membrane
The basilar membrane, which supports the organ of Corti
Lateral rectus
Moves eye laterally
Medial rectus
Moves eye medially
Superior rectus
Elevates eye and turns it medially
Inferior rectus
Depresses eye and turns it medially
Inferior oblique
Elevates eye and turns it laterally
Superior oblique
Depresses eye and turns it laterally