musculocutaneous nerve

筋皮神経

WordNet

1. any bundle of nerve fibers running to various organs and tissues of the body (同)nervus
2. control of your emotions; "this kind of tension is not good for my nerves"

PrepTutorEJDIC

1. 〈C〉『神経』 / 〈C〉《複数形で》『神経過敏』,いらだち / 〈U〉『勇気』,度胸(courage) / 〈U〉《時にa ~》厚かましさ,ずぶとさ;無礼 / 〈C〉葉脈;(昆虫の)翅脈(しみゃく) / 〈人,特に自分〉‘に'力を与える,‘を'元気づける

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/11/18 20:43:27」(JST)

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Musculocutaneous nerve
Nerves of the left upper extremity. (Musculocutaneous labeled at upper right.)
Details
From	lateral cord (C5-C7)
To	lateral cutaneous nerve of forearm
Innervates	anterior compartment of the arm
Identifiers
Latin	nervus musculocutaneus
TA	A14.2.03.024
FMA	37064
Anatomical terms of neuroanatomy [edit on Wikidata]

The musculocutaneous nerve arises from the lateral cord of the brachial plexus, opposite the lower border of the pectoralis major, its fibers being derived from C5, C6 and C7.

Structure

It penetrates the coracobrachialis muscle and passes obliquely between the biceps brachii and the brachialis, to the lateral side of the arm; a little above the elbow it pierces the deep fascia lateral to the tendon of the biceps brachii and is continued into the forearm as the lateral cutaneous nerve of the forearm.

In its course through the arm it innervates the coracobrachialis, biceps brachii, and the greater part of the brachialis.

• The branch to the coracobrachialis is given off from the nerve close to its origin, and in some instances as a separate filament from the lateral cord of the plexus; it is derived from the seventh, cervical nerve.
• The branches to the biceps brachii and brachialis are given off after the musculocutaneous has pierced the coracobrachialis; that supplying the brachialis gives a filament to the elbow-joint.
• The nerve also sends a small branch to the bone, which enters the nutrient foramen with the accompanying artery.

Variations

The musculocutaneous nerve presents frequent variations.

1. It may adhere for some distance to the median and then pass outward, beneath the biceps brachii, instead of through the coracobrachialis.
2. Some of the fibers of the median may run for some distance in the musculocutaneous and then leave it to join their proper trunk; less frequently the reverse is the case, and the median sends a branch to join the musculocutaneous.
3. The nerve may pass under the coracobrachialis or through the biceps brachii.
4. Occasionally it gives a filament to the pronator teres, and it supplies the dorsal surface of the thumb when the superficial branch of the radial nerve is absent.

Musculocutaneous nerve

Clinical significance

Although rare, the musculocutaneous nerve can be affected through compression due to hypertrophy or entrapment between the biceps aponeurosis and brachialis fascia or it may be injured through stretch as occurs in dislocations and sometimes in surgery.

Isolated injury causes weakness of elbow flexion and supination of the forearm.

A discrete sensory disturbance is present on the radial side of the forearm. The biceps reflex is also affected.

The nerve is usually involved in an upper brachial plexus palsy.

Injury can occur before entering the coracobrachialis due to dislocation or apparently due to stretch due to throwing injury

Heavy backpacks can cause damage to the upper trunk of the brachial plexus – dysfunction can be severe and prolonged with similar injury as occurs with Erb's palsy from breech deliveries. Early detection is important – the combination of time, avoidance of wearing a backpack, and strengthening of the shoulder muscles will probably be effective.

Musculocutaneous nerve

Distal to the coracobrachialis, the most common cause appears to be weight lifting – either through compression due to hypertrophy or entrapment between the biceps and brachialis, the nerve may lead to a painless loss of muscle strength in flexion and supination of the forearm. Initial treatment should include avoidance of biceps curls or other biceps exercises.

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

• Musculocutaneous_nerve at the Duke University Health System's Orthopedics program
• Hand kinesiology at the University of Kansas Medical Center

UpToDate Contents

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• 1. 上肢末梢神経症候群の概要 overview of upper extremity peripheral nerve syndromes
• 2. 腕神経叢症候群 brachial plexus syndromes
• 3. 下肢末梢神経症候群の概要 overview of lower extremity peripheral nerve syndromes
• 4. バーナー（刺す痛み）：スポーツ選手の急性腕神経叢損傷 burners stingers acute brachial plexus injury in the athlete
• 5. 末梢神経ブロック：手技 peripheral nerve block techniques

English Journal

• Extra and Intramuscular Distribution of the Thoracodorsal Nerve with Regard to Nerve Reconstruction Surgeries.

• Malalasekera A1, Beneragama T2, Kanesu S1, Sahathevan V1, Jayasekara R1.
• Journal of reconstructive microsurgery.J Reconstr Microsurg.2016 Jun;32(5):358-360. Epub 2016 Feb 18.
• Background The lateral branch of the thoracodorsal nerve (LBTN) is used for nerve transfer in facial, musculocutaneous, axillary nerve injuries and for irreparable C5, C6 spinal nerve lesions and accessory nerve defects. For a successful surgical outcome, the nerve to be used in nerve transfer sho
• PMID 26890860

• Ultrasound-guided block of selective branches of the brachial plexus for vascular access surgery in the forearm: a preliminary report.

• Matsuda H1, Oka Y1, Takatsu S2, Katsube R3, Yoshida R3, Oyama T3, Takeda Y4, Miyazaki M1.
• The journal of vascular access.J Vasc Access.2016 May 7;17(3):284-90. doi: 10.5301/jva.5000513. Epub 2016 Feb 8.
• PURPOSE: The operative field for vascular access (VA) surgery in the forearm is on the volar surface, and motor nerve block is not necessary for regional anesthesia. Therefore, selective block of branches of the brachial plexus may be a more efficient anesthesia technique.METHODS: Individual nerve b
• PMID 26868481

• Functional outcomes of infants with Narakas grade 1 birth-related brachial plexus palsy undergoing neurotization compared with infants who did not require surgery.

• Zuckerman SL1, Allen LA2, Broome C3, Bradley N4, Law C5, Shannon C6, Wellons JC 3rd6.
• Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery.Childs Nerv Syst.2016 May;32(5):791-800. doi: 10.1007/s00381-016-3039-9. Epub 2016 Feb 23.
• PURPOSE: This study aimed to investigate the functional outcomes of infants who underwent neurotization for shoulder abduction and elbow flexion in Narakas grade 1 birth-related brachial plexus palsy (BRBPP) and compare this cohort to children who progressed past the point of needing intervention.ME
• PMID 26906477

Japanese Journal

• 頭蓋内に進展した頭部MPNSTの治療経験 : 頭蓋形成術と遊離広背筋皮弁による一期再建

• 大芦 孝平,古川 洋志,齋藤 亮,岩井 里子,澤村 豊,久保田 佳奈子,山本 有平
• Skin cancer : official organ of the Japanese Society for Skin Cancer = 皮膚悪性腫瘍研究会機関誌 25(1), 75-80, 2010-05-15
• … Von Recklinghausen病は2〜10％の頻度でmalignant peripheral nerve sheath tumor（MPNST）を合併する。 …
• NAID 10026549859

• Morphological study, by teasing examination, of the communication from the musculocutaneous to median nerves

• MAEDA Satoshi,KAWAI Katsushi,KOIZUMI Masahiro,IDE Junji,TOKIYOSHI Akinari,MIZUTA Hiroshi,KODAMA Kodo
• Anatomical science international 84(1), 41-46, 2009-04-01
• NAID 10025550057

Related Links

• Musculocutaneous nerve - Wikipedia, the free encyclopedia

From, lateral cord (C5-C7). To, lateral cutaneous nerve of forearm. The musculocutaneous nerve arises from the lateral cord of the brachial plexus, opposite the lower border of the pectoralis major, its fibers being derived from C5, C6 and C7.

• Musculocutaneous Nerve - InnerBody.com

The musculocutaneous nerve in the arm is formed by splitting the brachial plexus at the inside border of the pectoral muscles ... In the leg, the superficial peroneal nerve (also called musculocutaneous nerve) passes between the peronei and...

Related Pictures

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★リンクテーブル★

リンク元	「筋皮神経」
関連記事	「nerve」

「筋皮神経」

　　[★]

英

musculocutaneous nerve (KL)

ラ

nervus musculocutaneus

関

橈骨神経、正中神経、尺骨神経、腕神経叢

筋：上腕の屈筋
皮：前腕外側の皮神経

由来

• 外側神経束(C5,C6,C7)

支配

• 筋枝
  • 上腕の屈筋
    • 烏口腕筋
    • 上腕筋
    • 上腕二頭筋
• 皮枝
  • 外側前腕皮神経 (N.464)

臨床関連

• 筋皮神経麻痺 (KL.127)
  • 肘神経の屈曲ができなくなるが、前腕の屈筋(腕頭骨筋)によりわずかに屈曲できる(KL.127)
  • 上腕二頭筋の麻痺により前腕の回外が弱くなる(KL.127)

Henry Gray (1825-1861). Anatomy of the Human Body. 1918.

「nerve」

　　[★]

• n.

• 神経

関

nervi、nervous、nervus、neural、neuro、neuron