Senses

2 groups

1st?

2nd?

1. general senses- those with receptors located throughtout the body

::somatic senses-provide sensory info about otuch, pressure, temp, pain

::Visceral senses- provide info about internal organs, pain and pressure

2. Special senses- specialized structures found in specfici areas of body

::smell, taste, sight, hearing, balance

Sensation- conscious awareness of stimuli from sensory

::Stimuation of sensory receptors doesnt resutl in sensation

::Action potentail must reach cerebral cortex

Types of sensory receptors

(5)

1. Mechanoreceptor-mechanical (compression or stretching)

2. Chemoreceptors- chemicals attach to receptor (Smell adn taste)

3. Thermoreceptors- changes in temp

4. photoreceptors- responces to light striking recepptor (Vision)

5. Nociceptors- pain receptors

Sensory areas  of cerebral cortex

Postcentral gyrus is called the 

postcentral gyus is called the primary somatic sensory cortex

::fibers carrying sensory input (PAIN TEMP PRESSURE) synapse in the thalamus, which relay in the information to promary somatic sensory cortex

::cortex is organized topographically relative to general plan of body

::Se nsory input from feet project to the most superior potion of cortex

::face is the most inferior portion of cortex

::side of area is related to # of neurons in tht area of body

taste area- taste is perceived at the inferior end of post central gyus 

olfactory: inferior to rontal lobe

Primary auditory cortex- located superior part of temporal lobe

Visual cortex= occipital lobe

primary sensory centers

::involed in process of recognition 

ex. visual association area-compares sisual input to past visual input...AKA decides whether to pass judgment on vision, does have vision have emotional value

motor areas of cerebral cortex

precentral gyrus is called the 

primary motor cortex

::control many voluntaary movements

::arranged totographically, similar to sensory

EX FEET SUPERIOR HEAD INFERIOR

*large areas of motor control have and need more neurons

premotor area location

define 

anterior to the primary motor cortex

::its where the motor function is rganized 

::organizes which muscles to contract adn to what degree

-importnat in planning, organizing, and coordinating motor movements

----Linked to each other, thalamus, cerebral cortex. 

::connections form feedback loops-initiates movement(SITTING to WALKING)