A&P I - Senses + Endocrine System
Terms
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Taste
- The tongue - Houses the taste buds, enabling the person to taste
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Taste
- Fungi Form Papillae -
Taste buds located on top of mushroom shaped rises
- also located on side walls of circumvallate -
Taste buds
- Characteristics -
Made of (3) type of cells
- Taste cells
- Support cells
- basal cells -
Taste
- Gustatory hairs -
- Project from taste & support cells
- Chemicals dissolve in saliva - then into taste pore to contact hairs
- cause depolarization leading to cranial nerves -
Taste
- Participating Cranial Nerves
- what they connect to... -
- Glossopharyngeal (IX) & Facial (VII)
- Connect to the Thalamus & Gustatory complex of parietal lobes -
Taste
- functions of taste buds -
- Taste
- Start digestion
- -
Taste
- special condition for taste buds to function - Has to be covered in a liquid
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Smell
- is what type of receptor - Chemoreceptor
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Smell
- Define olfaction - detecting the chemical output from food
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Smell
- relationship between taste and smell -
- 80% of taste is smell
- w/o smell, food tastes different -
Smell
- Anatomy -
- Mucous layer
- Cell cilia embedded in mucous
- Support Cells
- Nerve axons go through Ethmoid bone
- Cribiform plate
- Olfactory bulb & tract -
Accessory Structures
- Eyelids - Conjunctiva inside, produces lubricating mucus that keeps eye from drying out
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Accessory Structures
- Lacrimal Caruncle -
Sebaceous and sweat glands
- produce whitish, oily secretions -
Accessory Structures
- Lacrimal Glands
- List them (4) -
- Tear Ducts
- Lacrimal Sac
- Nasal Lacrimal Ducts
- Lacrimal Fluid -
Accessory Structures
- Lacrimal Glands
- Tear Ducts - Outer corners of eye
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Accessory Structures
- Lacrimal Glands
- Lacrimal Sac - Nasal
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Accessory Structures
- Lacrimal Glands
- Nasal Lacrimal Ducts - Enter Nasal cavity
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Accessory Structures
- Lacrimal Glands
- Lacrimal Fluid -
- Mucous
- antibodies
- lysozyme = enzyme that destroys bacteria -
Anatomy of the Eye
- Pupil -
- really a hole into eye
- black b/c of chorid layer inside eye
- Has circular and radial muscles -
Anatomy of the Eye
- Pupil
- Circular Muscles -
- Controlled by Parasympathetic
- When contracted = closes pupil
- When relaxed = opens pupil -
Anatomy of the Eye
- Pupil
- Radial Muscles -
- Controlled by Sympathetic
- When contracted = opens pupil
- When relaxed = closes pupil -
Anatomy of the Eye
- Iris -
- colored structure
- regulates amount of light entering the eye -
Anatomy of the Eye
- Lens
- connectios for shape - Ciliary bodies - ciliary muscles - smooth muscles that control shape
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Anatomy of the Eye
- Ciliary Processes -
- contain capillaries that secrete fluid into anterior segment of eye
- secretes Aqueous Humor -
Anatomy of the Eye
- Suspensory ligament - - Holds lens in upright postion
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Anatomy of the Eye
- Cornea - - Clear filament that covers front of lens
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Anatomy of the Eye
- Sclera -
- white portion of eye
- lines back of cornea -
Anatomy of the Eye
- Lens - - focuses light, to project into eye
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Anatomy of the Eye
- Aqueous Humor -
- fluid filling the anterior segment of eye
- secreted by capillaries of the ciliary process
- drains through Scleral Venous Sinus to nasal cavity -
Anatomy of the Eye
- Vitreous Humor - - Fluid filling the posterior segment of eye
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Anatomy of the Eye
- Choroid Layer -
- Highly vascular (lots of blood)
- between Retina and Sclera
- dark brown membrane to absorb light
- Continous w/ Iris -
Anatomy of the Eye
- Retina -
- in front of choroid layer
- Has yellow spot w/ Fovea Centralis and Macula Lutea -
Anatomy of the Eye
- Macula Lutea -
- AKA "Yellow Spot"
- location of Fovea Centralis
- Mostly cones
- light travels almost directly to photoreceptors -
Anatomy of the Eye
- Fovea Centralis -
- Made of entirely cones
- NO RODS
- almost no outer coverings -
Retina
- (2) layers -
- Pigmented Layer
- Neural Layer -
Retina
- Pigmented Layer - The outer layer of retina
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Retina
- Neural Layer -
- Inner layer of retina
- Rods and cones are the most exterior
- Next is bipolar cells which connect to muliple rods/cones
- next is ganglion cells which have axons that feed into the optic nerve
- this is the sight where the AP is originated -
Retina
- Optic Disk -
- AKA "Blind Spot"
- has no photoreceptors
- where optic nerve begins -
Brain - Image Interpretation
- Definition - When an image reaches the eye, it must then be processed and interpreted before reaching the brain
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Brain - Image Interpretation
- Ipsilateral -
- information stays on the same side of brain it was received.
- meaning no crossover occurs -
Brain - Image Interpretation
- Contralateral -
- Information crosses over to the opposite side of the brain
- information passes through Optic Chiasma -
Brain - Image Interpretation
- Overlap -
- duplicate information received in both eyes
- gives 3D images -
Brain - Image Interpretation
- Lateral Geniculate Nucleus -
- AKA "LGN"
- Group of cell bodies
- part of the thalamus
- information then goes to the Occipital lobe -
Photoreception
- Rhodopsin -
- protein in phospholipid bilayer of Rods & Cones
- Used during dark period of cycle
- helps to see shapes and pictures -
Photoreception
- (3) wavelengths to see what colors - Red, blue, green
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Photoreception
- During the Dark -
- Na+ channels open
- Na+ pumped in/out of creates dark current
- channels open at -30 mV
- Neurotransmitters are released to ensure Na+ gates stay open
- GMP to GDP Cycle -
Photoreception
- During the light -
- Light prevents GMP from cycling
- Na+ gates close, K+ gatse remains the same
- this causes hyperpolarization at -70 mV
- inhibits neurotransmitters
- Rhodopsin changes to opsin and retinal
- Rods are more sensative than cones -
Photoreception
- Summary -
Dark = Rhodopsin
Light = Opsin + Retinal A -
Mechanoreceptor
- Parts of outer ear -
- Pina
- exterior auditory canal
- tympanic membrane (ear drum) -
Mechanoreceptor
- Parts of Middle Ear
- (3) hearing bones -
- Incus - "Anvil"
- Malleous - "Hammer"
- Stapes - "Stirrups" -
Mechanoreceptor
- Parts of Middle Ear
- (2) muscles that control loudness of hearing -
- Tensor Tympani = attaches to Malleus and is long
- stapedius = attaches to the stapes and is small -
Mechanoreceptor
- Parts of middle ear
- auditory tube - - connects middle ear with the nasopharynx
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Mechanoreceptor
- Parts of inner ear -
- according to my notes - just the cochlea
- The cochlea houses receptors for hearing -
Mechanoreceptor
- Cochlea
- (3) parts -
- Upper is Scala Vestibuli
- oval window connects here
- Lower is Scala Tympani
- Middle is Scala Median -
Mechanoreceptor
- Cochlea
- Bony labryinth is filled w/ ... - - Endolymph
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Mechanoreceptor
- Cochlea
- Membranous labryinth is filled w/ ... - - perilymph
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Cochlea
- Organ of Corti -
- Tectorial Membrane is where hairs touch
- basilar membe
- hair cells embedded in it
- some touch tectorial, some dont
- starts at oval window and leads to round window
- Goes from narrow to wider to catch different frequencies -
Cochlea
- Scala Tympani - - filled w/ Perilymph (bony)
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Cochlea
- Scala Vestibuli - - filled w/ Perilymph (bony)
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Balance
- Vestibule -
- Functions in Static Equilibrium
- Bony Labryinth filled w/ perilymph
- (2) membranous sacs
- Saccule & Utricle -
Balance
- Vestibule
- Utricle & Saccule -
- Contain Maculae
- Otoliths
- Otolithic Membrane
- membranous labryniths filled w/ endolymph -
Balance
- Vestibule
- Utricle & Saccule
- Otoliths - Calcium Carbonate rocks on top to give weight to otolithic membrane
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Balance
- Vestibule
- Utricle & Saccule
- Otolithic membrane -
- Has hair cells with cilia embedded in it
- When membrane moves
- cilia moves
- enables person to know current position -
Balance
- Semicircular Canals -
- Functions in Direction of Rotational Accel/deceleration
- Dynamic Equilibrium
- Has (3) planes of bony labrinyths
- superior, lateral, posterior
- filled w/ perilymph
- Has Ampulla -
Balance
- Semicircular Canals
- Ampulla -
- Membranous labrynith filled w/ endolymph
- Crista Ampularis with Cupula -
Balance
- Semicircular Canals
- Ampulla
- Crista Ampularis -
- Crista contains
- Cupula
- Hair cells
- support cells
- fluid moves and bends hair cells
- creates nerve impulse
- which exits through vestibulocochlear nerve -
Balance
- Semicircular Canals
- Ampulla
- Crista Ampularis
- Cupula - - mass of gelatinous material covering hair and support cells
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Balance
- Vertigo -
- Cupula (gelatinous material) hardens
- can be treated with high frequency to break up material -
Balance
- Sea Sickness - - Inputs from Eyes and years dont jive togethre
- Endocrine Vs Exocrine
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- Endocrine
- secretions directly into blood
- ECF hormones regulate metabolic processes of other cells
- made of organic compounds
- Exocrine
- secretions discharge through duct
- directly onto epithelial surface to lubricate or digest -
Endocrine
- Major Glands -
- Pituitary
- Thyroid & Parathyroid
- Adrenal
- Isles of Langerhans
- Ovaries & Testes -
Hormone Output
- Negative feedback -
- most endocrine glands operate on this premise
- Make hormone until you get negative feedback to stop
- makes less waste -
Hormone Output
- Gland Stimuli
- 3 ways to stimulate -
- Humoral
- Neural
- Hormonal -
Hormone Output
- Gland Stimuli
- Humoral -
- secrete hormones in direct respone to change in blood levels of nutrients
- ex is insulin -
Hormone Output
- Gland Stimuli
- Neural -
- Secrete hormone in response to nerve stimuli
- ex is Epinephrine or Norepinephrine -
Hormone Output
- Gland Stimuli
- Hormonal -
- Secrete hormones in respone to hormones produced by other endocrine glands...
- and i dont know an example - Hormone Receptors
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- proteins in plasma membrane
- Located within target cells or cell membranes
- number of receptors change depending on hormone levels -
Hormone Receptors
- Up-regulation - Form more receptors in response to rising blood level of hormone
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Hormone Receptors
- down-regulation - loss of receptors to prevent target cells from overreacting
- Hormone Half-life
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- length of time a hormone remains in the blood
- can last from fraction of a min to 30 min - Hormone Classification
-
- classified vis structure
- NOT VIA FUNCTION***
- 2 types only -
Hormone Classification
- Type I -
- Steroids = lipids and fats
- fat soluble, shaped like cholesterol
- Can pass through plasma membrane
- activate transcription in nucleus of target cell
- interacts directly with DNA -
Hormone Classification
- Type I examples -
ex adrenal - aldosterone, corisal
ovaries - estrogen
testes - testosterone
thyroid - thyroxin -
Hormone Classification
- Type II -
- Peptide Hormones (proteins)
- produced by most endocrine glands
- Cant pass through plasma membrane
- has secondary messengers -
Hormone Classification
- Type II
- How it works -
- B/C its a protein, cant pass through plasma membrane
- Binds to receptor proteins on target cells surface
- causes cell to produce Intracellular messenger
- 2nd messenger is cAMP and IP3
- Function to stimulate enzyme activity which produces a desired end product -
Hormone Classification
- Type II
- how it stops -
phosphodiesterase - degrades cAMP
- effectively stops Type II action