2Infrahyoid Neck Below hyoid bone continuing into the mediastinum Retropharyngeal SpacePerivertebral SpacePosterior Cervical SpaceCarotid SpaceAnterior Cervical SpaceVisceral SpaceHypopharynx-LarynxThyroid GlandParathryoid Glands
3Retropharyngeal Space Space running behind the esophagus, in front of the danger space and between the carotid spaces from the skull base to the mediastinum. Below the hyoid bone it only contains fat. Retropharyngeal space and danger space are indistinguishable on CT and MRI. Pathology can include infection and tumor.
5Retropharyngeal Space Hyoid BoneArea representing the retropharyngeal space on an axial CT scan at the level of the hyoid bone.
6Retropharyngeal Space TracheaLeft lobe of thyroid glandArea representing the retropharyngeal space at the level of the mid-infrahyoid neck on an axial CT scan.
7Perivertebral SpaceCylindrical space surrounding the vertebral column from the skull base to the upper mediastinum. Bounded by the deep layer of the deep cervical fascia. Divided into prevertebral and paraspinal portions. Prevertebral-prevertebral and scalene muscles, brachial plexus roots, phrenic nerve, vertebral artery and vein, vertebral body. Paraspinal-paraspinal muscles and posterior elements of the vertebral column. Most perivertebral space lesions are found in the vertebral body.
10Perivertebral Space Perivertebral space. Prevertebral portion of the perivertebral space.Paraspinal portion of the perivertebral space.
11Perivertebral Space Left vertebral artery Scalene muscles Vertebral bodyParaspinal musclesSpinous process
12Posterior Cervical Space Posterolateral space in the neck extending from the posterior mastoid to the clavicle. Fat is the main component but also includes the accessory nerve, the spinal accessory lymph node chain (level 5), and part of the brachial plexus. Makes the posterior triangle of the neck. Divided by the omohyoid muscle into occipital triangle and subclavian triangle. During neck dissection the accessory nerve can be injured resulting in paresis of the sternocleidomastoid and trapezius muscles.
15Posterior Cervical Space Left external jugular veinPosterior Cervical SpaceTransverse cervical artery
16Carotid SpaceTwo tubular spaces surrounded by the carotid sheath traveling from the jugular foramen to the aortic arch. In the infrahyoid neck contains the carotid arteries, internal jugular veins, and cranial nerve X. Surrounded by the visceral and retropharyngeal spaces medially, perivertebral space posteriorly, anterior cervical space, and the posterior cervical space laterally. Pathology can include carotid artery dissection, internal jugular vein thrombosis, paraganglioma, and schwannoma.
23Visceral SpaceMidline cylindrical space surrounded by the middle layer of deep cervical fascia extends from the hyoid bone to the mediastinum. Contains the hypopharynx, larynx, trachea, thyroid gland, parathyroid glands and esophagus. Pathology can include soft tissue mass as well as symptoms related to mass effect such as hoarseness from recurrent laryngeal nerve, dysphagia, and stridor or shortness of breath.