Nervous System II

One layer of meninges, Outer Venous sinuses Flax Duran sinus Epidural space

Membrans of the CNS Protects the CNS has three layers: Dura mater. Arachnoid Mater. Pia mater

One layer of meninges Middle Space contains cerebrospinal fluid (CSF)

One layer of meninges Inner Blood vessels Nourishes CNS

How many ventricles are there?

Interconnected cavities within cerebral hemispheres and brain stem. Continuous within the central canal of the spinal cord. Filled with cerebrospinal fluid (CSF)

Clear fluid, volume is about 140 ml Circulates in ventricles, centralncanal of spinal cord and the subarachnoid space Completely surrounds the brain and spinal cord Nutritive and protective Helps maintain stable ion concentrations in the CNS

Functions of spinal cord

Automatic, subconscious responses to stimuli within or outside the body

Simple reflex arc

Most common reflex arc

Reflex arc example cycle

Sensitive to a specific type of internal exchange

Conducts an impulse from the receptor into the brain or spinal cord

Serves as processing center. Contexts am impulse from the sensory neuron to its synapse with a motor neuron

Conducts skim pulse from the brain or spinal cord out to the synapse with an effector

Responds to stimulation by the motor neuron and produces the reflex or behavioral action

Functions of the brain

Four major parts of the brain

Frontal lobes Parietal lobes Occipital lobes Temporal lobes Insula

Midbrain Pons Medulla oblongata

2 halves, separated by flax cerebri

Connects the cerebral hemispheres

Ridges or convolutions