Posterior branches of thoracic nerves

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Nerve: Posterior branches of thoracic nerves
Diagram of the distribution of the cutaneous branches of the posterior divisions of the spinal nerves.
Latin	rami posteriores nervorum thoracicorum
Gray's	subject #209 923
From	thoracic nerves
Dorlands / Elsevier	r_02/12691742

The posterior branches of thoracic nerves branch from the dorsal rami of the thoracic nerves.

Contents 1 Branches 1.1 Medial branches 1.2 Lateral branches 1.3 Medial cutaneous branches 2 Additional images

Branches

Medial branches

The medial branches of the posterior divisions of the upper six thoracic nerves run between the Semispinalis dorsi and Multifidus, which they supply; they then pierce the Rhomboidei and Trapezius, and reach the skin by the sides of the spinous processes.

The medial branches of the lower six are distributed chiefly to the Multifidus and Longissimus dorsi, occasionally they give off filaments to the skin near the middle line.

Lateral branches

The lateral branches increase in size from above downward.

They run through or beneath the Longissimus dorsi to the interval between it and the Iliocostales, and supply these muscles; the lower five or six also give off cutaneous branches which pierce the Serratus posterior inferior and Latissimus dorsi in a line with the angles of the ribs.

The lateral branches of a variable number of the upper thoracic nerves also give filaments to the skin.

The lateral branch of the twelfth thoracic, after sending a filament medialward along the iliac crest, passes downward to the skin of the buttock.

Medial cutaneous branches

The medial cutaneous branches of the posterior divisions of the thoracic nerves descend for some distance close to the spinous processes before reaching the skin, while the lateral branches travel downward for a considerable distance—it may be as much as the breadth of four ribs—before they become superficial; the branch from the twelfth thoracic, for instance, reaches the skin only a little way above the iliac crest.

Additional images

Areas of distribution of the cutaneous branches of the posterior divisions of the spinal nerves.

Diagram of the course and branches of a typical intercostal nerve.

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e Nerves: spinal nerves
Cervical (8)	C1, C2, C3, C4, C5, C6, C7, C8 anterior (Cervical plexus, Brachial plexus) - posterior (Posterior branches of cervical nerves, Suboccipital - C1, Greater occipital - C2, Third occipital - C3)
Thoracic (12)	T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 anterior (Intercostal, Intercostobrachial - T2, Thoraco-abdominal nerves - T7-T11, Subcostal - T12) - posterior (Posterior branches of thoracic nerves)
Lumbar (5)	L1, L2, L3, L4, L5 anterior (Lumbar plexus, Lumbosacral trunk) - posterior (Posterior branches of the lumbar nerves, Superior cluneal L1-L3)
Sacral (5)	S1, S2, S3, S4, S5 anterior (Sacral plexus) - posterior (Posterior branches of sacral nerves, Medial cluneal nerves)
Coccygeal (1)	anterior (Coccygeal plexus) - posterior (Posterior branch of coccygeal nerve)