Brain Basics
What makes up the central nervous system?
The central nervous system is made up of the brain and spinal cord, which work together to process, interpret, and respond to information from the body.
Which lobe is responsible for vision?
The occipital lobe is primarily responsible for visual processing, including interpreting color, shape, and motion from visual input.
Where is Broca’s area located?
Broca’s area is located in the frontal lobe of the left hemisphere and is primarily responsible for speech production and motor planning of language.
What is an afferent pathway?
An afferent pathway carries sensory information from the body to the central nervous system, allowing the brain to interpret stimuli like touch, pain, and temperature.
What are glial cells?
Glial cells are supportive cells in the nervous system that protect neurons, provide nutrients, remove waste, and help maintain proper functioning of neural networks.
What is the role of the peripheral nervous system?
The peripheral nervous system includes all nerves outside the CNS and is responsible for carrying sensory information to the brain and spinal cord and sending motor commands back to the body.
Which lobe is mainly responsible for hearing and language comprehension?
The temporal lobe is responsible for processing auditory information and plays a key role in understanding language, especially through Wernicke’s area.
What is the function of Wernicke’s area?
Wernicke’s area, located in the temporal lobe, is responsible for understanding spoken and written language and making sense of meaning.
What is an efferent pathway?
An efferent pathway carries motor signals from the central nervous system to muscles and glands, allowing the body to perform movements and actions.
What part of the neuron receives signals?
Dendrites are the parts of the neuron that receive incoming signals from other neurons and transmit them toward the cell body.
What are the three anatomical planes of the brain?
The three anatomical planes are sagittal (divides left and right), coronal (divides front and back), and horizontal (divides top and bottom), and they are used to study brain structures from different perspectives.
Which lobe controls movement and decision-making?
The frontal lobe is involved in voluntary movement, decision-making, problem-solving, and planning, as well as speech production.
What does the arcuate fasciculus connect?
The arcuate fasciculus is a bundle of nerve fibers that connects language comprehension areas in the temporal/parietal lobes with speech production areas in the frontal lobe.
What is the corticospinal tract responsible for?
The corticospinal tract is a descending motor pathway that controls voluntary movement of the limbs and trunk, especially fine motor control.
What is depolarization?
Depolarization is the process in which the inside of a neuron becomes more positive due to sodium ions entering the cell, initiating an action potential.
What is a gyrus?
A gyrus is a raised ridge or fold on the surface of the brain that increases surface area and allows for more neurons to be packed into the cortex.
What does the primary motor cortex do?
The primary motor cortex is the main area responsible for initiating voluntary muscle movements and sending motor commands to different parts of the body.
What happens if Broca’s area is damaged?
Damage to Broca’s area can result in Broca’s aphasia, where speech becomes slow, effortful, and grammatically simplified, while comprehension is often relatively preserved.
What is the corticobulbar tract responsible for?
The corticobulbar tract carries motor signals from the cortex to cranial nerve nuclei and controls muscles of the face, head, and neck used in speech and swallowing.
What are the three layers of the meninges?
The meninges consist of three protective layers—dura mater, arachnoid mater, and pia mater—that surround and protect the brain and spinal cord.
What is the function of cortical sulci?
Cortical sulci are grooves or indentations in the brain that increase surface area, allow for greater processing capacity, and help separate different functional regions of the cortex.
What is executive function?
Executive function refers to higher-level cognitive processes such as planning, organizing, decision-making, impulse control, and adapting behavior to different situations, mainly controlled by the frontal lobe.
Why is the middle cerebral artery important for language?
The middle cerebral artery supplies blood to key language areas like Broca’s and Wernicke’s areas, so damage or blockage can lead to language impairments such as aphasia.
What is the decussation of the pyramids?
The decussation of the pyramids is the crossing of motor fibers in the brainstem, which explains why each side of the brain controls movement on the opposite side of the body.
What is the function of cerebrospinal fluid?
Cerebrospinal fluid circulates around the brain and spinal cord, providing cushioning, protection, nutrient transport, and waste removal for the nervous system.