Nervous System

Fact: The average weight of an adult's brain is 1300-1400 grams.

Functions of the Nervous System

The central nervous system sends messages throughout the body via motor neurons through interneurons which transports messages to muscles and glands. Sensory neuron sends information back to the brain regarding pain, temperature, lights, sounds, and other sensory information.

The CNS and PNS

Central Nervous System

The central nervous system consists of the brain and the spinal chord. The central nervous system controls most of the body. The brain sends information all over the body on both conscious and unconscious actions and interprets information sent from sensory neurons.

Peripheral Nervous System

The peripheral nervous system is broken down into two sections. The somatic and autonomic nervous systems. The somatic nervous system is responsible for controlling the body's movements and receiving external stimuli consciously. The autonomic nervous system manages the unconscious portions of the body and responses, such as the "fight or flight" and bodily functions.

Parts of the Brain

The Cerebrum

The cerebrum is divided into to halves by the corpus collosum. It controls many mental functions such as short and longterm memory, reasoning, spacial, creative skills. These are all part of the cerebrum.

The Cerebellum

The cerebellum controls coordination, balance, and movement.

The Brain Stem

The brain stem is supposedly the oldest of the brain structures in evolutionary terms. It controls the most basic functions of the body such as breathing and heartrate.

The Pituitary Gland

Controls growth in the body via hormones. It is the size of the pea and regulates and produces hormones in the body.

The Structures Behind the Five Senses

Taste - Taste Buds

Picture taste by the taste buds on their tongue. It receives stimuli which is the sent to the nerve and brain.
Humans taste by the taste buds on their tongue. It receives stimuli which is the sent to the nerve and brain.

Types of Neurons

Neurons can be classified by their function and how they relate to the organs

Sensory: Transmits nerve/sensory impulses to the brain and spinal chord.
Motor: Carries signal away from the brain or spinal chord to muscles and glands.
Interneuron: Transmits impulses between neurons.