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Which cells dominate, or serve as operative receptors, in dim light?

Following blunt force trauma to the head, a patient has a tendency to repeat phrases or words.  Her grammar and syntax are disordered too, though comprehension appears intact.  What type of aphasia does she have?

What is the most common form of dementia in older adults?

Which of the following would significantly decrease the speed of passive current flow in a neuron?

A patient is having difficulty regulating the position of his head.  Exam reveals a lack of reflex activation of neck muscles with swift turns of the head.  Imaging demonstrates a cervical spinal cord tumor.  Which tract has been damaged by the tumor?

A 26 year old female presents to her primary care physician with a complaint of difficulty chewing.  She states it is extremely difficult to chew anything.  Exam demonstrates a loss of sensation on the left cheek and mandible.  An MRI of the face demonstrates a large schwannoma (tumor of Schwann cells) in the infratemporal fossa.  Which cranial nerve has been compromised?

Prominent in the cervical and lumbar regions, which of the following is known to hypertrophy and contribute to cord or nerve root compression?

An 18 year old male is brought to the emergency department by his parents after exhibiting some odd behavior.  His parents are suspecting drug use and are demanding a toxicology screen.  His parents state the patient has been acting inappropriately in public and has been bringing home a different girlfriend every week.  They also note several other subjective changes in personality.   In speaking with the patient, the physician discovers the patient’s thoughts are quite disordered.  The patient’s physical exam is normal.  Besides blood work and a urine toxicology screen, the physician orders a CT scan of the head, and a large tumor is seen.  Based on the information above, where is the tumor?

Excess serotonin and dopamine levels are found in schizophrenia.  How is this neurotransmitter (or neuromodulator in this case) classified?

A lesion in which area of the brain most likely causes dysdiadochokinesia?