Question

Review & Practice Sheet Exercise Autonomic Nervous System 26 Matching Ich each structure of the autonomic nervous system escription on the isted on the left with the correct 1. prendonk neuron A. parasympathetic division of ANS 2. gray ramus B. Randia located in the wall of the vincera 1. basic sympathetic C carries preganglionic axon into a chain response anglion 4. rami communicantes D. meron with cell body located in 5. thoracolumbar division autonomic anglion of ANS E. rest and dipst response 6. collateral ganglia E parasympathetic nerve Outlowing from 7. intramural ganglia sacral spinal segments 8. white ramus G. white and gray rami 9. ganglionic neuron H. ganglia located anterior to spinal cord 10. craniosacral division L neuron with cell body in lateral ytary of ANS hom of spinal cord 11. pelvic nerve J. carries postganglionic aron into a spinal 12. basic parasympathetic response K. sympathetic division of ANS L fight-or-flight response terve B. Short-Answer Questions 1. Discuss the anatomy of the sympathetic chain ganglia. How do fibers enter and exit these ganglia? 2. Which cranial nerves are involved in the parasympathetic division of the ANS? 3. Compare the lengths of preganglionic and ganglionic neurons in the sympathetic and parasympathetic divisions of the ANS. C. Drawing 1. Draw It! In the following figure, draw the preganglionic and ganglionic neurons for a sympathetic pathway from the CNS to visceral effectors in the skin.

Answer 1

preganglionic neuron 2. Grey ramus I Neuron with cell boring in lateral grey hoon of spinal cord. J. carries postearglionic oson into a spinal nerve. L. fight or flight response 3. Basic cympathetic Response. 4. Ramicommunicantes. G. White and prey sami. 5. Thoracolumbar division of ANS k. Sympathetic division of ANS 6. Collateral Ganglia H. anterior to Ganglia located spinal cord. 7. Intramural ganglia. B. Ganglia located in the wall of viscera. 8. White Rames. c. carries poeganglionic axon into a chain ganglion. D. Neuson with cell body located into outonomic ganglian 9. Ganglionic Neceron mic Necron. 10. Craniosacral division of ANS A. Parasympathetic division of ANS. 11. Pelvic Nerve F. parasympathetic nerves outflowing from sacral spinal segments. E. Rest and digest Response 12. Basic parasympathetic - Response

Anatomy of sympathetic chain Ganglia- Herent Nerve bees (Thoracolumbar outflow) Preganglionic sympathetic fibres arise in the lateral grey column of the spinal cord from segments T to L2. From each of these segments they emerge as small myelinated axons into the corresponding anteriore primary ramus and pass via white ramur communicans into the ganglion of a sympathetic brunk. -> Reganglionic fibres affex reaching the paraverkbral ganglia (ganglia in the sympathetic chain) they are distributed as follows - () synapse withe the cells in the ganglion. Post ganglionic fibres aviring from the ganglion cells. rejoin the spinal nerves (qrey yami communicantes) and distributed through its branches to the blood vessels, Sweat glands, axvector pili muscles. (ii) Ascend in the sympathetic trunk to synapse in the cervical sympathetic ganglia. Cim Descend in the sympathetic bronk to synapse in the lumbar sympathetic ganglia. liv) leave the ganglia without synapsing as splanchnic nerve and relay in prevertebral ganglia. - sympathetic Trunks ganglionated chains of are a nerve fibres lying one on either side of vertebral column, extending along its whole length ie foom Atlas vertebrae to coccyx. Each chain bears a number of knot like enlargements, the sympathetic ganglia.

Inferior. the fusion of ganglia. There are a ganglia in Thoracic region. 3 ganglia in cervical region 4 ganglia in lumbar region A ganglia in Sacral region. cervical sympathetic Ganglia- Extende from bace of skull to neck of sost Ribe flost Ri It consists of 3 ganglia - superior 2 Formed during middle e development by * superior cervical Ganglion smaller segmental It is largest and formed by fosion of upper 4 cervical Ganglia. Lies in front of transverse procese of Q and Cz vertebra. Branches - (i) Grey rami communicantee to ventral Rami of Upper tous cervical spinal herves (i) Aterial branchee to both external and internal carotid arteries. -> fibres carried by External carotid Artery are vasomotor, sudo motor, pilomotor and supply areas of skin mainly supplied by trigeminal Nerve. Fibres carried by Internal carotid Artery are to the dilator pupillae and smooth mscle of levator palpebrae superioris tri) cardiac branch to the Heart. * middle cervical Ganglion (small and formed by fusion of 5th and 6th cervical ganglia. Branches - (1) Grey Rami communicanter to sth and 6th cervical spinal nerves. (1) Arterial branch to inferior thyroid Artery for distribution to pharynx, larynx and upper parts of trachea and Oerophagus thyouid and parathgooid. (ii) cardiac branch to the Heart

* Inferior Cervical Ganglion - formed by the fusion of fth and 8th cer Branches-li) Grey Rami Communicantes to c7 and co. spinal nesues ti) Arterial Branch to both subclavian and vertebral Arteries. Cili) Cardiac Branch to the Heart THORACIC GANGLIA Thoracic part of sympathetic trunk consists of 1 ganglia. They are connected by grey and white rami communicantes to the thoracic spinal nervos. TI-T5 ganglia give post ganglionic fibres to the fibres to the Heart long and oesophagus. a lower & ganglia give preganglionic fibres, which are grouped to form the three sphlanchnic neres. - Greater sphlanchnic nerve arises from 5th to ath - thoracic ganglia. → less er splanchnic nerve arise from lith 10th and - thoracic ganglia. y least spranchnic nerve arise from 12th ganglion. LUMBAR GANGLIAI The Abdominal part of sympathetic trunk consists of four ganglia. "Only upper 2 ganglia receive white rami communicantee from first and second Lumbar spinal nerves. All ganglia give grey rami communicantes to corresponding lumbar spinal Berues, - Visceral branches and Lumbar splanchnic nerves from ganglia pass downwoods, to form a pleaus in front of the 5th Lumbar and upper sacral vertebrae, called superior hypogastria plexes. It lies between the common Iliac vessels. It divides into two inferior hypogastric plexus one in each side of rectum.