. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 452 SYMPATHETIC NERVE. pearance. The lower cervical ganglion pre- sents an irregularly oblong shape, about ith of an inch in length and T'^th of an inch in thickness, and still has the appearance of being pro'onged downwards into the first thoracic ganglion. The thoracic ganglia are much smaller, measuring about —th of an inch ; and are more or less triangular in shape, present- ing the lobulated aspect above described. The connecting cord between the different ganglia has a reddish grey colour, is flattened, mea- suring
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 452 SYMPATHETIC NERVE. pearance. The lower cervical ganglion pre- sents an irregularly oblong shape, about ith of an inch in length and T'^th of an inch in thickness, and still has the appearance of being pro'onged downwards into the first thoracic ganglion. The thoracic ganglia are much smaller, measuring about —th of an inch ; and are more or less triangular in shape, present- ing the lobulated aspect above described. The connecting cord between the different ganglia has a reddish grey colour, is flattened, mea- suring about Tvijth of an inch in breadth, and presents the appearance of consisting of dis- tinct bundles of fibres. A portion of these can be traced over the surface of the ganglia, others appear to sink into them, while a con- siderable number can be traced into the rami communicantes. The latter are very distinct; some of them in the thoracic region appear to be almost as thick as the cord of the S3'inpa- thetic itself, and all of them present the same greyish red appearance. On turning inwards to the sympathetic, many of their fibres are seen to be prolonged into the main cord of the sympathetic, and merely run along the sides of the corresponding ganglia : these pass both upwards towards the head, and down- wards in the direction of the pelvis. They join the spinal nerves at the point where the anterior and posterior roots become united into a common trunk. By far the greater portion of the fibres in the rami communi- cantes run inwards towards the spinal cord. The splanchnic nerve, which is about |th of a line in thickness, has a whiter aspect than the main cord of the sympathetic. The nerves on the surface of the heart are very numerous and distinct, presenting the same arrangement as has been already de- scribed. The cceliac and epigastric plexuses are also large; the latter containing several ganglia. There are also several small ganglia in the plexus upon the abdominal
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