Chapter 13 - The Peripheral Nervous System Flashcards
PNS links the —– with the body and the external environment
CNS
2 subdivisions of Visceral Motor Division (ANS)
Sympathetic Divison
Parasympathetic Divison
Motor neurons carry signals to the —— and —— muscles and glands
Cardiac and Smooth
Sympathetic Nervous System described as the ————– response
Fight or flight
Parasympathetic Nervous System described as the ————- response
Rest & Digest
Sympathetic and Parasympathetic neurons carry signals to viscera
Sympathetic Motor Neuron to heart
Parasympathetic Motor Neuron to Urinary bladder
Nerves that attach to the brain; innervate structures of the head & neck
Cranial Nerves
Anterior Root carries Efferent information away from the spinal cord. Only contains Axons of —— neurons
Motor
Posterior Root carries Afferent information to the spinal cord. Only contains Axons of —– neurons
Sensory
The posterior and anterior roots are — street(s)
One-way streets
—– —— trunk is what joins the roots and the rami (singular=ramus)
Spinal nerve
—— —— carries sensory signals from PNS to spinal cord
Posterior (Dorsal) root
—— —— carries somatic and visceral motor signals from CNS to skeletal muscles and gland cells
Anterior (Ventral) root
—– —— carries visceral motor, somatic motor, and sensory signals TO AND FROM the spinal cord
Spinal Nerve
—– —— carries visceral motor signals from ANS to organs of the ventral body cavity
Ramus Communicans
—— ———– carry somatic motor signals from the CNS to skeletal muscles, and sensory signals from sensory receptors in the PNS to spinal cord
Anterior (Ventral) Rami & Posterior (Dorsal) Rami
—— Nerve supplies the diaphragm muscle that drives ventilation.
With Axons (C3,C4,C5)
Phrenic Nerve
There are 31 pairs of Spinal Nerves
Cervical Nerves (C1-C8)
Thoracic Nerves (T1-T12)
Lumbar Nerves (L1-L5)
Sacral Nerves (S1-S5)
Coccygeal Nerves (Co1)
Nerve Plexuses are networks of intersecting nerves that serve specific regions of the body. They are formed by ——
Anterior Rami
Four main nerve plexuses
Cervical plexuses (C1-C5)
Brachial plexuses (C5-T1)
Lumbar plexuses (L1-L4)
Sacral plexuses (L4-S4)
Major nerve of Cervical plexuses (C1-C5) is
Phrenic nerve
3 Major nerves of Brachial plexuses (C5-T1)
Radial Nerve - Innervate thumb
Median Nerve - Innervate middle finger
Ulnar Nerve - Innervate Pinki finger
Lumbar plexuses (L1-L4) - Posterior Divison - The largest nerve is
Femoral Nerve (L2-L4)
Hip flexion and Knee extension
Sacral plexuses (L4-S4) contain the largest nerve in the body…
Sciatic Nerve (S1-S3) - Innervates gluteus maximus, back of thigh, and lower leg and foot
