Astereognosis: Information from Answers.com

Astereognosis
Classification and external resources
ICD-9	780.99

Astereognosis is the inability to identify an object by touch without visual input. As opposed to agnosia, when the object is observed visually, one should be able to successfully identify the object.

Astereognosis is associated with lesions of the parietal lobe or Dorsal Column.^[1]

References

^ Normal">"Sensory > Normal". http://library.med.utah.edu/neurologicexam/html/sensory_normal.html.

v • d • e Symptoms and signs: Speech and voice (R47-R49, 784)

Aphasia/Dysphasia	Expressive aphasia · Receptive aphasia · Conduction aphasia

Other speech disturbances	Dysarthria · Schizophasia · Aprosodia/Dysprosody

Symbolic dysfunctions	Dyslexia/Alexia · Agnosia (Prosopagnosia, Astereognosis, Gerstmann syndrome) · Dyspraxia/Apraxia (Ideomotor apraxia) · Dyscalculia/Acalculia · Agraphia

Voice disturbances	Dysphonia/Aphonia

Lesions of spinal cord and brain

Spinal cord/
vascular myelopathy

sensory: Sensory ataxia - Tabes dorsalis

motor: Motor neurone disease

mixed: Brown-Séquard syndrome - cord syndrome (Posterior, Anterior, Central/Syringomyelia) - Subacute combined degeneration of spinal cord (B12) - Cauda equina syndrome

Anterior spinal artery syndrome

Brainstem

Medulla (CN 8, 9, 10, 12)	Lateral medullary syndrome/Wallenberg (PICA) - Medial medullary syndrome (ASA)

Pons (CN 5, 6, 7, 8)	Lateral pontine syndrome (AICA) - Millard-Gubler syndrome (lateral) - Medial pontine syndrome (basilar) - Foville's syndrome (dorsal, basilar) - Locked-In syndrome (ventral) - Internuclear ophthalmoplegia - One and a half syndrome

Midbrain (CN 3, 4)	Weber's syndrome (ventral peduncle, PCA) - Benedikt's syndrome (ventral tegmentum, PCA) - Parinaud's syndrome (dorsal, tumor)

Other	Alternating hemiplegia