disease has location motor neuron disease anterior horn cell disease disease_ontology SNOMEDCT_US_2025_09_01:267693003 MESH:D016472 ICD9CM:335 UMLS_CUI:C0154681 A motor neuron disease that is characterized by lower motor neuron signs of wasting, weakness, and loss of reflexes and that is located in the anterior horn of the spinal cord that contains the motor neurons responsible for body muscles. DOID:4873 ventral horn of spinal cord