Blog Archives

Brain Anatomy & Function

We all know that the brain is divided into a left and right hemisphere (and if you didn’t, you do now), the left hemisphere controls logic interpretation and is considered to be more involved with language, mathematics, abstraction and reasoning. The right hemisphere is responsible for “holistic” functioning (controlling body and soul as a whole) and is involved in spatial abilities, face recognition, visual imagery and music.

To put it simply, the left is logic and the right is arts.

However, there is much more divisions within the brain, each responsible for certain functions. I will just be giving a simple overview of the brainstem, cerebellum, frontal lobe, temporal lobe, occipital  lobe and parietal lobe.

At the back of the brain is the occipital lobe, this region of the brain processes all of the information that you see. It is responsible for visual recognition of shapes and colours. Any information collected by the eyes are delivered directly to opposite side of the occipital lobe. For example, the left eye sends its information to the right side of the lobe for visual interpretation.  Any damage in this lobe will cause visual deficits, such as loss of vision or inability for visual recognition.

The parietal lobe is behind the frontal lobe and is further divided into left and right. The lobe as a whole controls sensory information and body orientation. This lobe processes stimuli related to touch, pain, pressure and temperature. Damage to the right side causes visuospatial deficits (difficulty with finding your way around), while damage in the left causes inability to understand language.

The temporal lobe is located on both sides of the brain, near the ears which dominates their function. These lobes are in charge of auditory processing but are also responsible for memory storage and smell. The right lobe has authority over visual memory while left controls verbal memory. If the temporal lobe is damaged, hearing deficits will develop.

The frontal lobe is obviously located in the front of the brain as indicated in the name. This is where the more complex cognitive (mental) functions happens, such as planning, organizing, problem solving, selective attention, behavior and emotions. This region of the brain is separated into the prefrontal and premotor cortex by the central culcus. Damages causes inattentiveness, inability to concentrate, behavior disorders, difficulty in learning new information and lack of inhibition.

The prefrontal cortex determines your personality and controls your judgement.

The premotor cortex fine tunes the motor movements made by the motor area and are responsible for planning, selection and initiation of action.

The brainstem is considered the highway for fibres and nerves connecting the brain and the spinal cord. The brainstem is made up of 3 parts; pons, midbrain and medulla oblongata.

The pons connect the medulla and the brain, acting as a relay station. They are also a respiratory centre.

The midbrain contains the visual and auditory reflex centre.

The medulla oblongata contains the cardiac centre, respiratory centre and vasomotor centre. They also control reflexes like coughing, gagging, swallowing and vomiting.

The cerebellum, also known as the “little brain”, is responsible for motor coordination, adaptation to the environment and balance. If the little brain is damaged, there could be tremor, ataxia (lack of coordination) or nystagmus (involuntary movement of the eye).

The brain is a complex organ that regulates breathing, walking, controlls homeostasis (internal functioning) and development. Many people live their whole lives without understanding or giving credit to this evolutionary masterpiece.

Untangling the Brain

This video describes the Human Connectome Project, where scientists try to map the neurons and connections within the human brain.