The dance-like movements of the head and extremities may be associated with which hereditary degenerative disease?

Huntington's chorea, often simply referred to as Huntington's disease, is characterized by chorea, which encompasses irregular, dance-like movements of the body, particularly the head and extremities. This hereditary degenerative condition affects the nervous system and leads to symptoms that include involuntary jerking or writhing movements. The genetic mutation related to Huntington's disease causes progressive degeneration of nerve cells in the brain, leading to both motor and cognitive dysfunction.

In contrast, Parkinson's disease primarily results in tremors, rigidity, and bradykinesia rather than the dance-like movements seen in Huntington's chorea. Alzheimer's disease is primarily recognized for its cognitive decline and memory loss rather than significant motor disturbances. Tay-Sach's disease is a genetic disorder that causes the progressive destruction of nerve cells in the brain and spinal cord, but it does not present with the characteristic chorea seen in Huntington's disease. Thus, the association of dance-like movements with Huntington's chorea is what makes it the correct answer.