Nervous systems Flashcards
what does the nervous systems function as
the central operator and central intelligence for the body
what does the nervous system do
regulates bodily functions, provides for an internal method of communication between the brain and other organs as well as between the organism and the environment
what are the components for the central nervous system or CNS
brain and spinal cord
what is in the peripheral nervous system (PNS) comprised of?
cranial and spinal nerves
what is the command center
cns
what is the communication lines that links all parts to the body to the cns
pns
what can injuries to the nervous system often result in
paralysis (paraplegia, quadriplegia, and hemiplegia)
what is the eye
organ of sense, classified to the nervous system becuase they coalesce in nerve endings called sensory receptors. eye is complex strucure situated in the bony orbit or socket formed by 7 bones
what are the bones of the eye socket
frontal, maxillary, sphenoid, lacrimal, malar bone, ethmoid and palatine bones
what are the three layers of the eyeball
retnia (innermost), choroid (middle), sclera (outermost)
what separates the eye into anterior and posterior segments
the crystalline lens separates the two segments and refracts light as it enters the eye
what is in the anterior segment of the eye
this segment is filled with aqious humor
what is in the posterior segment of the eye
this segment is filled with viterous humor
how does the eye move
there are six ocular muscles that work in opposition to move the eye in multiple directions to facilitate a wide field of vision
how does the ear work
works in tandum with the auditory nerves to send auditory impulses to the temporal lobes of the cerebrum, these structures form the auditory apparatus
