michelle test 4

michelle test 4 - 1 Spinal Cord-Portion of the CNS that...

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Unformatted text preview: 1 Spinal Cord-Portion of the CNS that lies within the vertebral canal and is surrounded and protected by the vertebral column. -Connects brain to the rest of the body. -Has many functions with include a long nerve cable that connects the brain and body, somatic and autonomic reflexes, motor pattern control centers, and sensory and motor modulation. -continues from medulla oblangota and ends at first or second lumbar vertebrae Protective structures o Cranium consists of eight bones (skull) Frontal Occipital Temporal (2) Parietal (2) Sphenoid Ethmoid Cranial vault: encloses and protects the brain and other structures Galea aponeurotica: thick fibrous band of tissue, overylying cranium between the frontal and occipital muscles, affords added protection to skull Subgaleal space: venous connections with dural sinuses; and with increased intercranial pressure, blood can be shunted to this space to reduce the pressure; common site for wound drains after surgery 2 Cranial vault floor: many openings for cranial nerves, blood vessles, and spinal cord to exit; divided into anterior fossa (frontal lobe), middle fossa (temporal lobes and base of diencephalon) and posterior fossa (cerebellum) o Meninges (p 288) Surrounding the brain and spinal cord are three protective membranes.----- epidural space Dura mater hard mother outer layer o Arachnoid: internal to dura mater, weblike structure that loosely follows the contours of cerebral structures o Periosteum (endosteal layer): outer layer of dura mater o Inner dura (meningeal layer)L: rigid membranes that support separate various brain structures *two layers separated by venous sinuses-------subdural space Arachnoid softer, spongy like -------subarachnoid space Pia mater thin membrane, follows the contour of the brain. o Provides support for blood vessels serving brain tissue o Choroid plexus : arises from pial membrane, structures that produce CSF Subdurial hematoma blood clot b/w dura mater and the arachnoid Subarachoid hematoma blot clot b/e arachnoid and pia mater (WORSE, closer to brain tissue). Epidural space- b/w dura mater and the skull 3 Have bleeding into the epidural and it is usually bleeding from an artery not venous. Arterial bleeding is worse the venule Meningitis inflammation of the meninges o Cerebrospinal fluid (CSF) and the ventricular system CSF is a clear, colorless fluid similar to blood plasma and interstitial fluid Cushions brain and spinal cord Continually made 125-150ml circulation at any given day within ventricles (small cavities) and subarachnoid space 600 ml of CSF produced a day Produced by the choroid plexuses in the lateral, third, and fourth ventricles....
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This note was uploaded on 07/12/2011 for the course NURSING 000 taught by Professor Clark during the Spring '11 term at Alabama.

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michelle test 4 - 1 Spinal Cord-Portion of the CNS that...

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