Week 5 Vocabulary

• Control center and communication network of the human body
• -Directs functions
• -Interperets stimuli
• -Determines reactions to chance

• Process of keeping the bodies internal environment within critical limits.
• -In the short term, homeostasis controlled by the nervous system.

Brain and Spinal Cord

Everything else that is not the Central nervous system.

sensory neurons - input to brain.

Nerve cell, made up of 3 parts

Mass of the cell, with nucleus and supports machinery

Receptive areas, i.e. inputs

Extension of cell body i.e. outputs

Seperate cells around the axon

Detects environmental stimuli

Recieves impulses from the receptors

Transmit impulse for interpretation and processing

Reaction to stimulus

Transmitted along nerves much the same way that data is transmitted via ethernet cable.

Negative inside, positive outside

Na+ rush into cell

K+ rush to restore balance

• Junction between an axon terminal branches close to nearest dendrites
• -impulse reaches axon terminals

• Acetycholine most common
• -Epinephrine
• -Seratonin
• -Dopamine
• -Endorphines

• Groups of myelinated axons
• -Forms nerve tracts in CNS

• Nerve cell bodies and dendrites
• -immyelinated axon bundles
• -Cortex: gray matter on surface of brain

• Cranial bones - meninges
• -cerebrospinal fluid (CSF)

Controls breathing, heart rate and reactions to auditory and visual stimuli

Controls Homeostasis

Controls intellectual processes and emotions

maintains body posture and balance

• Has ascending and descending tracts, connects spinal cord and brain
• -some tracts cross over in medulla

• Pons: Connects spinal cord with brain, connects each part of the brain with each other
• -Helps control breathing

Nerves from the eyeballs

• Relay station for sensory impulses
• -interpretation center for pain, temp, and touch

Contain Pineal Gland

• Home of homeostasis: Controls and intigrates autonomic nervous system
• -recieves sensory impulses from organs
• -controls petuitary gland
• -very little conscious control

Gray matter surface

Seperates two hemispheres

Folds singular to gyrus

Grooves (singular to sulcus)

Bridge connecting 2 hemispheres

Control muscular movement

interprets sensory impulses

Process emotions and intellects

muscle movement, moods, agression, shell

touch, pain, balance, taste, temp

hearing

sight

• Butterfly shaped, below cerebrum
• -2 partially seperated hemispheres
• -Posture, balance
• -Fine muscle movements

Protector of spinal cord, 3 layers

"tough mother"

"Cobweb" Fiberous

• "Tender mother" 
• -Contains spinal fluid

• commit at root
• Dorsal: sensory

Pressure, vibration, texture

heat, cold

mechanical, thermal, chemical

muscle length position

• On tongue, palate and pharynx
• -Depends on chemical dissolved in saliva
• -Taste influenced by olfactory senses

salty, sweet, sour, bitter, and umami

White outer wall of the eye

transpartent front of the eye

Colored part of the eye, which contracts and expands to limit light

Hole in the center of the iris

the space between the cornea and the lens, filled with aqueois humor (fluid)

120 million, only percieves shades of grey

6-7 million - color perception, less sensetive

The big space in side the eye, behind the lens, filled with the vitrious fluid.

Clear tissue that focuses light on the retina

Light sensitive lining of the eyeball, containing rods and cones

Pit in the center of the back of the eyeball, where the majority of the receptors are located

The nerve that carries optic info to the Brain

The "Blind Spot" where the optic nerve exits the eye with no receptors

Light sensors

Helps to protect the eye from outside debris

External visible, flexible part, cartilidge

Another name for auricle

Linked with hair and ceruminus glands

Vibrates in response to sound, ear drum

Outer protruding rim

Ear Lobe

Tiny bones in the inner ear, malleus, incus, and stapes

The stepes vibrates the oval window to set up vibrations inside the cochlea, and round window is the pressure relief

Equalizes pressure in the middle ear

hearing and equilibrium

Kinetic