HSS 3305 Lecture Notes - Lecture 21: Subarachnoid Hemorrhage, Central Nervous System, Subdural Hematoma

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Meninges: dura firm, outer covering, arachnoid middle, subarachnoid space space btwn arachnoid and pia contains cerebrospinal fluid (csf) and strands of arachnoid connective tissue, pia thin, inner membrane, adheres to brain and spinal cord. Willis at the base of brain: venous blood from brain into large venous sinuses in dura, sinuses eventually drain into jugular veins. Cerebral injury large blood vessels over surface of brain may be torn by force of injury. Alzheimer"s disease progressive mental deterioration, emotional disturbances: anatomic and biochemical features resulting in cerebral cortex atrophy and ventricular enlargement. Peripheral nerve injury traumatic injury, lacerations, fractures, crush injury: nerve entrapment neuropathy external compression of fibrous band, median nerve commonly involved decreased sensation of the hand, may need surgical release if unresponsive to conservative treatment. 4: muscular weakness that begins in legs and spread rapidly to affect other muscles of trunk and upper extremities; sensory disturbances are infrequent.

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