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Peripheral nervous system

Peripheral nervous system. Dr Iram Tassaduq. COMPONENTS OF PERIPHERAL NERVOUS SYSTEM. Cranial nerves Spinal nerves. Cranial Nerves. 12 pair of nerves that arise from brain & exit through foramina leading to muscles, glands & sense organs in head & neck. The Spinal Nerves.

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Peripheral nervous system

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  1. Peripheral nervous system Dr IramTassaduq

  2. COMPONENTS OF PERIPHERAL NERVOUS SYSTEM • Cranial nerves • Spinal nerves

  3. Cranial Nerves • 12 pair of nerves that arise from brain & exit through foramina leading to muscles, glands & sense organs in head & neck

  4. The Spinal Nerves • 31 pairs of spinal nerves (1st cervical above C1) • mixed nerves exiting at intervertebral foramen

  5. EXTENT OF SPINAL CORD

  6. EXTENT OF SPINAL CORD • Spinal cord grows slowly as compared to vertebral column. • It ends at lower border of L1 • Length of nerve roots increase progressively

  7. Caudaequina • Roots of lumbar and sacral nerves below the level of termination of cord form a vertical bundle of nerves that resemble a horse tail

  8. DERMATOME

  9. Nerve Plexuses • Ventral rami branch & anastomose repeatedly to form 5 nerve plexuses • cervical in the neck, C1 to C5 • supplies neck and phrenic nerve to the diaphragm • brachial in the armpit, C5 to T1 • supplies upper limb and some of shoulder & neck • lumbar in the low back, L1 to L4 • supplies abdominal wall, anterior thigh & genitalia • sacral in the pelvis, L4, L5 & S1 to S4 • supplies remainder of butt & lower limb • coccygeal, S4, S5 and C0

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