Neurovasculature of the back
After completing this study unit you will be able to:
- Identify the main arteries of the back and neck and their branches.
- Describe the venous drainage of the back and neck.
- Name the main nerves of the back and neck.
The back is a region on the posterior surface of the trunk which extends from the inferior border of the neck to the gluteal region. The layers of the back comprise the skin, subcutaneous tissue, superficial and deep back muscles, the posterior portion of the ribs, and the vertebral column housing the spinal cord and surrounding meninges. The back plays an important role in stabilizing and enabling movements of the trunk, upper limbs and head.
The structures of the back are supplied by several important arteries, veins, and nerves. The arterial supply arises from several main sources: directly from the aorta for much of the posterior thorax and abdomen, or via the subclavian arteries in the neck and scapular regions. The veins of the back and neck mainly drain into the brachiocephalic veins, azygos venous system, and inferior vena cava. The nervous supply mainly arises from the cervical, thoracic and lumbar spinal nerves.
Learn more about the neurovascular supply of the back and posterior neck in the video below.
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Explore each of the structures you learned about today in the gallery below.
|Occipital artery||Back of scalp, sternocleidomastoid muscle, deep muscles of back and neck|
|Deep cervical artery||Deep muscles of neck|
|Transverse cervical artery||Trapezius muscle, sternocleidomastoid muscle|
Posterior intercostal arteries
||Muscles and skin of the thoracic region|
|Subcostal artery||Subcostal region|
|Lumbar arteries||Muscles and skin in lumbar region|
|Superficial (extrinsic) muscles of back||All muscles innervated by branches of cervical/brachial plexus or intercostal nerves except for the trapezius muscle (accessory nerve [CN XI])|
|Deep (intrinsic) muscles of back||Almost all muscles innervated by posterior rami of cervical/thoracic/lumbar spinal nerves|
|Suboccipital muscles||Suboccipital nerve (C1)|
|Cervical region||Posterior rami of spinal nerves C2-C4/5, greater/lesser/third occipital nerves (C2-C3)|
|Thoracic region||Posterior rami of spinal nerves T2-T12, lateral cutaneous branches of 2nd-11th intercostal nerves/subcostal nerve|
|Lumbar region||Posterior rami of spinal nerves L1-L2/3|
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