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The sympathetic trunk is a fundamental part of the sympathetic nervous system, and part of the autonomic nervous system. It allows nerve fibres to travel to spinal nerves that are superior and inferior to the one in which they originated. Also, a number of nerves, such as most of the splanchnic nerves, arise directly from the trunks.
The cervical sympathetic trunk is situated posteriormedial to the carotid sheath. [2]: 551 The carotid sheath is situated at each lateral boundary of the retropharyngeal space, [3] deep to the sternocleidomastoid muscle. [2]: 579 [3] [2]
The following is a list of nerves in the human body: ... Sympathetic trunk; Temporal branches of the facial nerve; Third occipital nerve; Thoracic aortic plexus;
The thoracic ganglia are paravertebral ganglia.The thoracic portion of the sympathetic trunk typically has 12 thoracic ganglia.Emerging from the ganglia are thoracic splanchnic nerves (the cardiopulmonary, the greater, lesser, and least splanchnic nerves) that help provide sympathetic innervation to thoracic and abdominal structures.
The sympathetic nervous system's primary process is to stimulate the body's fight or flight response. It is, however, constantly active at a basic level to maintain homeostasis . [ 4 ] The sympathetic nervous system is described as being antagonistic to the parasympathetic nervous system.
The pelvic portion of each sympathetic trunk is situated in front of the sacrum, medial to the anterior sacral foramina. It consists of four or five small sacral ganglia , connected together by interganglionic cords, and continuous above with the abdominal portion.
The carotid plexus is a network of intersecting sympathetic nerves which run parallel to the carotid artery into the head. [1] They branch out from the superior cervical ganglia of the sympathetic chain. The lesser petrosal nerve receives sympathetic innervation from the carotid plexus along with parasympathetics from the glossopharyngeal nerve ...
The sacral ganglia are paravertebral ganglia of the sympathetic trunk. [1]:39 As the sympathetic trunk heads inferiorly down the sacrum, it turns medially. There are generally four or five sacral ganglia. In addition to gray rami communicantes, the ganglia send off sacral splanchnic nerves to join the inferior hypogastric plexus. Near the ...