Nervous System, Brain Structures, and Neurological Disorders Flashcards

Flashcards formatted as Question and Answer covering lecture topics on brain regions, functional systems, memory, traumatic injuries, neurological disorders, and spinal cord anatomy.

What is the primary role of the thalamus in the brain?

It acts as a relay station to ensure sensory and motor information goes to the appropriate spots in the higher areas of the brain.

Which hormone does the pineal gland secrete, and what process does it regulate?

It secretes melatonin, which helps control the sleep-wake cycle.

What function do the superior colliculi in the midbrain perform?

They serve as visual reflex centers responsible for eye reflexes.

Which region of the midbrain integrates motor movements and degenerates in Parkinson's disease?

The substantia nigra.

What is the name of the large hole at the base of the skull through which the brainstem connects to the spinal cord?

The foramen magnum.

What is the function of the inferior olivary nuclei in the medulla?

They relay stretch information from the muscles and joints to the cerebellum.

What is the functional difference between the vestibular nuclei and the cochlear nuclei?

Vestibular nuclei process balance and equilibrium information, while cochlear nuclei process hearing information.

Which nerve causes hiccups when it spasms due to irritation?

The phrenic nerve, which controls the diaphragm.

What type of sensory receptors send information to the cerebellum regarding muscle stretch and body orientation in space?

Proprioceptors.

Which structure of the limbic system recognizes danger and elicits fear or anger responses?

The amygdala (also known as the amygdaloid body).

What is the function of the fornix in the brain?

It is a fiber tract that links the limbic system to other brain regions.

Which structure in the limbic system helps express emotions through physical behaviors like facial expressions and gestures?

The cingulate gyrus.

What is the main role of the reticular activating system (RAS)?

It sends impulses to the cerebral cortex to keep it conscious and alert while filtering out about 99.9 percent of repetitive or unimportant stimuli.

Where is Broca's area located, and what is its specific function?

It is located in the frontal lobe near the motor cortex and controls motor speech production.

What deficit occurs when there is damage to Wernicke's area?

An inability to understand spoken and written language, leading to speech output that sounds like nonsense.

How does anterograde amnesia differ from retrograde amnesia?

Anterograde amnesia prevents the formation of new memories after an accident, while retrograde amnesia involves the loss of memories formed in the distant past.

What is syncope, and what typically causes it?

Syncope is fainting (a brief loss of consciousness) usually caused by inadequate cerebral blood flow.

What protein accumulates to form tangles inside neurons in Alzheimer's disease?

Beta amyloid peptides.

What genetic pattern and typical age of onset characterize Huntington's disease?

It is an autosomal dominant genetic disorder with an onset typically occurring in the late 30s to early 40s.

What term describes the wild, involuntary flapping movements seen in Huntington's disease?

Chorea.

What type of neurons are located in the dorsal horns of the spinal cord gray matter, and what information do they receive?

Interneurons that receive somatic and visceral sensory information from the skin and internal organs.

Which horn of the spinal cord gray matter contains somatic motor neurons?

The ventral horn.

Where in the spinal cord are lateral horns located, and what system do they serve?

They are located between the lower thoracic and upper lumbar regions and serve the sympathetic nervous system.