Membranes which protect the central nervous system.
Meninges
Membrane between the pia mater and the dura mater covering the central nervous system.
Arachnoid
Area of the retina with the highest concentration of cones.
Fovea or yellow spot
Region on the brain associated with problem solving.
Cerebrum
Centre in the brain which controls sleep.
Hypothalamus
Sensory, motor and mixed nerves linking receptor and effector organs with the spinal cord of the brain.
Peripheral nerves
Physiological connection between the axon of one neuron and the dendrite of another.
Synapse
Nervous system which consists of cranial and spinal nerves..
Peripheral nervous system
Branch of the autonomic nervous system that decreases the heartbeat back to normal.
Parasympathetic system
Ear drum attached to the ossicles.
Tympanic membrane
Part of the brain that produces ADH.
Hypothalamus
Series of changes that take place in the shape of the lens and the eyeball in response to the distance of an object from the eye.
Accommodation
Receptors in the ear that detect changes in the direction and speed of head movements.
Cristae
Watery fluid that supports the cornea and the front chamber of the eye.
Aqueous humour
Nerve cell that carries nerve impulses from receptors towards the CNS.
Sensory neuron
Rapid involuntary response to a stimulus.
Reflex action
Part of a neuron that serves to insulate and thereby increase the speed of impulse conduction.
Myelin sheath
Part of the brain that joins the two hemispheres.
Corpus callosum
The spaces between sections of myelin along a nerve fibre
nodes of Ranvier
Nerves attached to the brain.
Cranial nerves
