What is the primary function of the nervous system?
Controlling the activities of the body
Understanding the anatomy of the nervous system is essential for comprehending its functions.
What are the two types of nervous tissue patterns in the CNS?
- Gray matter: unmyelinated regions with cell bodies and dendrites
- White matter: myelinated regions with axons
Gray matter contains nuclei, while white matter is also referred to as tracts.
What is a ganglion?
Collection of neuron cell bodies in the PNS
In contrast, a nucleus refers to a collection of cell bodies in the CNS.
What protects the CNS?
- Bone: cranium and vertebral column
- Membranes: meninges (dura mater, arachnoid mater, pia mater)
These structures provide physical protection to the brain and spinal cord.
Which layer of the meninges is the most superficial?
Dura mater
The dura mater is thick and collagen-rich.
What is the function of cerebrospinal fluid (CSF)?
- Cushions and protects the brain and spinal cord
- Delivers nutrients
- Carries away wastes
CSF volume is regulated to prevent excess intracranial pressure.
What are the three primary vesicles formed during the development of the nervous system?
- Forebrain
- Midbrain
- Hindbrain
These primary vesicles later differentiate into secondary vesicles.
What are the four major regions of the brain?
- Cerebrum
- Diencephalon
- Brainstem
- Cerebellum
Each region has distinct functions and structures.
What does the corpus callosum do?
Bridges the cerebral hemispheres for communication
It is a white matter tract that facilitates interhemispheric communication.
The frontal lobe is involved in which functions?
- Planning and initiating muscle contraction
- Decision making
- Higher-order cognitive behaviors
The precentral gyrus serves as the primary motor cortex.
What is the role of the hypothalamus?
- Regulates homeostasis
- Controls autonomic nervous system functions
- Regulates hormone secretion of the pituitary gland
It is considered the ‘master’ endocrine gland.
What are the three regions of the brainstem?
- Midbrain
- Pons
- Medulla oblongata
These regions are involved in various autonomic functions and pathways.
What does the thalamus do?
Relays information between cerebral cortex, periphery, spinal cord, and brainstem
It is a major sensory integration and processing area.
True or false: The cerebellum is responsible for processing visual information.
FALSE
The occipital lobe is responsible for visual processing, not the cerebellum.
Fill in the blank: The endoneurium covers _______.
An individual axon
It is the innermost layer of connective tissue in peripheral nerves.
What are the types of white matter tracts?
- Association tracts
- Commissural tracts
- Projection tracts
These tracts connect different parts of the nervous system.
What is the function of basal nuclei?
- Control intensity and appropriateness of muscle movements
- Involved in regulation of emotions
They connect to nuclei in the brainstem to influence motor pathways.
What is the hypothalamus involved in regulating?
- Homeostasis
- Blood pressure
- Cardiac and smooth muscle contractions
- Activities of internal organs
- Hormone secretion of the pituitary gland
- Body temperature
- Hunger and thirst
The hypothalamus is considered the “master” endocrine gland.
List the three regions of the brainstem from superior to inferior.
- Midbrain
- Pons
- Medulla oblongata
These regions play crucial roles in various brain functions.
What are the functions of the inferior colliculi in the midbrain?
- Aid in processing auditory stimuli
They are part of the corpora quadrigemina.
What does the substantia nigra in the midbrain do?
Inhibits motor neurons to help control smooth motor movements
It is crucial for motor control.
What is the pons visible as?
A bulge on the anterior of the brain stem
It lies between the midbrain and medulla oblongata.
What does the medulla oblongata regulate?
- Heart rate
- Blood pressure
- Ability to breathe
- Swallowing
- Coughing
- Sneezing
It houses the fourth ventricle and contains pyramidal tracts.
True or false: The brainstem contains control centers for breathing, heart rate, and blood pressure.
TRUE
Damage to these centers can be life-threatening.
