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62 terms

Anatomy Ch 17

Set of flashcards for Anatomy BIOL 2401 at SHSU
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Chemoreceptors
chemicals
Thermoreceptors
temperature
Nociceptors
pain, dense on skin and mucous membrane, all organs but not brain
Mechanoreceptors
physical deformation
photoreceptors
light
general receptors
widely distributed over body
Special receptors
complex sense organs of head
Interoceptors
origin in internal organs
Proprioceptors
origin of stimuli position/movement in muscles/joints
Exteroreceptors
eyes, ears sense external stimuli
Unencapsulated
nerve endings not wrapped
Free nerve endings
skin, pain, heat, cold
Tactile discs
skin, light touch
Hair receptors
entwined in hair follicles, light touch, movement of hair
Encapsulated
nerve endings wrapped in glial cells or connective tissue
Tactile Corpuscle
light touch and texture, hairless skin (palm)
Riffuni corpuscle
heavy touch, joint movements, dermis
Lamellated corpuscle
deep pressure, stretch, tickle, vibration, deep dermis, viscera
First pain
Myelinated, sharp pain, 40-100 ft/s
Second pain
unmyelinated, dull pain, 1-7 ft/s
Referred pain
visceral pain seems to be felt in other areas of body such as skin, convergence of neural pathways
Taste buds
about 4,000, tongue, soft palate, pharynx, epiglottis, cheeks, taste 80% smell, sweet, sour, bitter, salty, umami, on papillae
Foliate papillae
parallel ridges on sides of tongue
Fungiform papillae
3 taste buds per papillae, widely distributed, food texture
Filiform papillae
nongustatory, cats use to groom, most abundant, food texture
Vallate papillae
V at back of tongue, 7-12
Taste pore
hole on epithelial surface of tongue
Olfaction
smell
Olfactory mucosa
detects scent, contains 10-20 million olfactory neurons
Ear
develops from first pharyngeal pouch
Hearing
response to vibrating air molecules
Equilibrium
sense of motion and balance
Outer ear
funnel for conducting sound to tympanic membrane
Auricle
fleshy outer ear
Auditory canal
passage through temporal bone
Gaurd hairs
protect outer end of canal
Cerumen
earwax, stops foreign particles from entering canal
Tympanic membrane
middle ear, vibrates in response to sound
Auditory (eustachian) tube
passage to nasopharynx
Auditory ossicles
Malleus, Incus, Stapes, middle ear
Bony labyrinth
filled with perilymph, similar to CSF, inner ear
Vestibule
balance, inner ear
Semicircular canals
detect rotation of head, inner ear
Cochlea
hearing, inner ear, filled with endolymph, sound waves generate nerve signals
Membranous labyrinth
interconnecting sacs and ducts, inner ear
Conjunctiva
transparent mucous membrane covering inner surface of eyelid and anterior surface of eyeball, keeps eye moist
Lacrimal gland
12 ducts, tears cleanse and lubricate eye, deliver oxygen and nutrients
Superior rectus
movement up and laterally
Medial rectus
movement medially
Lateral rectus
movement laterally
Inferior rectus
movement down and medially
Superior oblique
passes through trochlea, movement down and laterally
Inferior oblique
movement up and laterally
Aqueous humor
fluid secreted by ciliary body, posterior chamber between iris and lens, anterior chamber between cornea and iris
Lens
suspended, tension flattens lens
Vitreous body
transparent body fills vitreous chamber (posterior), keeps retina smoothly pressed against inner surface
Retina
thin transparent membrane, posterior, detached causes blurry vision and blindness if separated
Optic disc
convergence of retinal nerve fibers
Rods
night vision, saturated and nonfunctional in ordinary light
Cones
day vision, color vision, blue, green, orange-yellow, dependent on wavelength
Leprosy
leprosy bacteria blocks sense of pain in affected areas, individuals neglect minor wounds, finger/ toe loss
Diabetes
causes nerve damage, lesions can cause finger/toe/limb loss