6 Cranial nerves Olfactory …purely sensory (smell) Optic…purely sensory (vision)Oculomotor…motor fibers to four muscles of the eye.Trochlear ….motor to superior obliqueTrigeminal… sensory from skin of the face and mucosa of the nose and mouth &motor to chewing musclesAbducens… motor to lateral rectus muscle
8 Facial …motor for muscles of facial expression & sensory for anterior part of tongue. Vestibulocohlear…sensory(balance & hearing)Glossopharyngeal…motor fibers to pharynx &sensory for posterior part tongue.
9 Vagus…sensory & motor for pharynx, larynx and abdominal and thoracic viscera (parasympathetic). Accessory….motor (sternocleidomastoid & trapezius).Hypoglossal… sensory & motor for tongue
11 Spinal nerves and nerve plexuses 31pairs of human spinal nervesSpinal nerves are formed by combination of Ventral and dorsal rootsit divides into dorsal and ventral ramiBoth the spinal nerve and rami contain both motor and sensoryThe smaller dorsal rami ….skin and muscles of posterior body trunk
14 The ventral rami of T1-T12 …intercostal nerves… The ventral rami of T1-T12 …intercostal nerves….supply the muscles of anterior and lateral trunkPleuxes…cervical C1-C5brachial C5-C8 and T1lumbar L1-L4sacral L4-L5 and S1-S4
15 Autonomic nervous system Is the motor subdivision of the PNS that controls body activities automatically .Special group of neurons that regulate cardiac, smooth muscles and glands.Support body activities.Involuntary nervous system.
17 Somatic nervous system Somatic (voluntary) and autonomic (involuntary)In somatic , the cell bodies of the motor neurons are inside the CNS, and their axons (in spinal nerves) extend all the way to the skeletal muscle.
18 autonomic nervous system Autonomic nervous system, has a chain of two motor neuronsThe first neuron (in brain or spinal cord),it’s axon (preganglionic axon) leave the CNS to synapse with the second motor neuron in a ganglion outside the CNS. The axon of this neuron, (the postganglionic axon), that extends to the organ it serves.
19 Sympathetic and parasympathetic are two arms of ANS. Both of them serve the same organs but cause the opposite effects.Sympathetic part ( fear, exercise)Parasympathetic part ( conserve energy)
22 Anatomy of parasympathetic The first neurons of the parasympathetic division are located in brain nuclei of several cranial nerves –3,7,9, and 10.And in S2 through S4.The first neurons (cranial) send their axons (preganglionic), they synapse with second neuron in terminal ganglion to send postganglionic axon to organ.
23 In sacral region, preganglionic axon ( pelvic nerves) In sacral region, preganglionic axon ( pelvic nerves)..also called pelvic splanchnic nerves to synapse in the terminal ganglia close to the organ.
25 Anatomy of sympathetic Thoracolumbar division T1-L2The preganglionic axon leave the cord in the ventral root to enter the spinal nerve and pass through ramus communicans to enter sympathetic chain synapse at the same level or different level or it didn’t synapse (splanchnic nerves) to synapse into collateral ganglion (celiac, superior, inferior)