Intercostobrachial nerve

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Nerve: Intercostobrachial nerve
Nerves of the left upper extremity. (Intercostobrachial nerve visible near top center.)
Latin	nervi intercostobrachiales
Gray's	subject #211 946
From	intercostal nerves #2 and #3
Dorlands / Elsevier	n_05/12565946

The intercostobrachial nerves are cutaneous branches of the intercostal nerves.

Contents 1 Second intercostal nerve 2 Third intercostal nerve 3 See also 4 Additional images 5 External links

[edit] Second intercostal nerve

The lateral cutaneous branch of the second intercostal nerve does not divide, like the others, into an anterior and a posterior branch; it is named the intercostobrachial nerve.

It pierces the Intercostalis externus and the Serratus anterior, crosses the axilla to the medial side of the arm, and joins with a filament from the medial brachial cutaneous nerve.

It then pierces the fascia, and supplies the skin of the upper half of the medial and posterior part of the arm, communicating with the posterior brachial cutaneous branch of the radial nerve.

The size of the intercostobrachial nerve is in inverse proportion to that of the medial brachial cutaneous nerve.

[edit] Third intercostal nerve

A second intercostobrachial nerve is frequently given off from the lateral cutaneous branch of the third intercostal; it supplies filaments to the axilla and medial side of the arm.

[edit] See also

• Cutaneous innervation of the upper limbs

[edit] Additional images

Cutaneous nerves of right upper extremity.

Diagram of segmental distribution of the cutaneous nerves of the right upper extremity.

[edit] External links

• SUNY Labs 05:st-0505 - "Axillary Region: Nerves"
• Hand kinesiology at UK nerves/intercos.htm
• Intercostobrachial+nerves at eMedicine Dictionary

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 As such, some of the information contained herein may be outdated.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)