musculus coracobrachialis

烏口腕筋

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/01/16 05:53:46」(JST)

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Coracobrachialis muscle
Deep muscles of the chest and front of the arm, with the boundaries of the axilla. Coracobrachialis is shown in blue.
Position of coracobrachialis muscle (shown in red).
Details
Latin	musculus coracobrachialis
Origin	Coracoid process of scapula
Insertion	Medial humerus
Artery	Brachial artery
Nerve	Musculocutaneous nerve (C5, C6, and C7)
Actions	adducts humerus , flexes the arm at glenohumeral joint
Identifiers
Dorlands /Elsevier	m_22/12548663
TA	A04.6.02.017
FMA	37664
Anatomical terms of muscle [edit on Wikidata]

The coracobrachialis is the smallest of the three muscles that attach to the coracoid process of the scapula. (The other two muscles are pectoralis minor and the short head of the biceps brachii.) It is situated at the upper and medial part of the arm.

Structure

It arises from the apex of the coracoid process, in common with the short head of the biceps brachii, and from the intermuscular septum between the two muscles.

It is inserted by means of a flat tendon into an impression at the middle of the medial surface and border of the body of the humerus (shaft of the humerus) between the origins of the triceps brachii and brachialis.

Innervation

It is perforated by and innervated by the musculocutaneous nerve. which arises from the anterior division of the upper (C5, C6) & middle trunks (C7) of the brachial plexus.

Development

Variation

Function

The action of the coracobrachialis is to flex and adduct the arm at the glenohumural joint. Also, the coracobrachialis resists deviation of the arm from the frontal plane during abduction. Therefore, the contraction of the coracobrachialis leads to two distinct movements at the shoulder joint. It both draws the humerus forward, causing shoulder flexion, and draws the humerus toward the torso, causing shoulder adduction. To a smaller extent, it also turns the humerus inwards, causing inward rotation. Another important function of the coracobrachialis is the stabilization of the humeral head within the shoulder joint, especially when the arm is hanging freely at a person’s side.

Clinical significance

The overuse of the coracobrachialis can lead to stiffening of the muscle. Common causes of injury include chest workouts or activities that require to press the arm very tight towards the body, e.g. work on the rings in gymnastics. Symptoms of overuse or injury are pain in the arm and shoulder, radiating down to the back of the hand. In more severe cases, the musculocutaneous nerve can get trapped, causing disturbances in sensation to the skin on the radial part of the forearm and weakened flexion of the elbow, as the nerve also supplies the biceps brachii and brachialis muscles. Actual rupture to the coracobrachialis muscle is extremely rare. Very few case reports exist in the literature, and it is reported to be caused by direct trauma to the contracted muscle. Avulsion of the muscle's origin from the coracoid as a result of indirect forces is even more unusual.

References

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

Additional images

• Position of coracobrachialis muscle (shown in red). Animation.

• Close up. Seen from below. Ribs are not shown.

• Still image. Lateral view.

• Front of right upper extremity. (Coracobrachialis labeled at right, fourth from the bottom.)

• Left scapula. Costal surface.

• Left humerus. Anterior view.

• The right brachial plexus (infraclavicular portion) in the axillary fossa; viewed from below and in front.

• The axillary artery and its branches.

• The brachial artery.

• The veins of the right axilla, viewed from in front.

• Nerves of the left upper extremity.

• Coracobrachialis muscle (shown in green text)

• Coracobrachialis muscle (shown in green text). Horizontal section of arm.

• Coracobrachialis muscle (shown in green text)

• Coracobrachialis muscle (shown in green text)

• Coracobrachialis muscle (shown in green text)

References

External links

• -758120371 at GPnotebook
• PTCentral

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

• 1. リケッチア痘瘡 rickettsialpox
• 2. 二頭筋腱障害および腱断裂 biceps tendinopathy and tendon rupture
• 3. 末梢神経ブロック：手技 peripheral nerve block techniques
• 4. 上肢末梢神経症候群の概要 overview of upper extremity peripheral nerve syndromes

English Journal

• Ultrasound-guided anterior axilla musculocutaneous nerve block.

• Kokkalis ZT, Mavrogenis AF, Saranteas T, Stavropoulos NA, Anagnostopoulou S.SourceFirst Department of Orthopaedics, Attikon University Hospital, 41 Ventouri Street, 15562, Holargos, Athens, Greece.
• La Radiologia medica.Radiol Med.2013 Dec 3. [Epub ahead of print]
• PURPOSE: This paper presents a technique of ultrasound-guided localisation and block of the musculocutaneous nerve through the anterior wall of the axilla.MATERIALS AND METHODS: Twenty patients (7 males and 13 females; mean age, 35 years) had axillary nerve block for upper extremity trauma. With th
• PMID 24297578

• Multibody system of the upper limb including a reverse shoulder prosthesis.

• Quental C, Folgado J, Ambrósio J, Monteiro J.AbstractThe reverse shoulder replacement, recommended for the treatment of several shoulder pathologies such as cuff tear arthropathy and fractures in elderly people, changes the biomechanics of the shoulder when compared to the normal anatomy. Although several musculoskeletal models of the upper limb have been presented to study the shoulder joint, only a few of them focus on the biomechanics of the reverse shoulder. This work presents a biomechanical model of the upper limb, including a reverse shoulder prosthesis, to evaluate the impact of the variation of the joint geometry and position on the biomechanical function of the shoulder. The biomechanical model of the reverse shoulder is based on a musculoskeletal model of the upper limb, which is modified to account for the properties of the DELTA® reverse prosthesis. Considering two biomechanical models, which simulate the anatomical and reverse shoulder joints, the changes in muscle lengths, muscle moment arms, and muscle and joint reaction forces are evaluated. The muscle force sharing problem is solved for motions of unloaded abduction in the coronal plane and unloaded anterior flexion in the sagittal plane, acquired using video-imaging, through the minimization of an objective function related to muscle metabolic energy consumption. After the replacement of the shoulder joint, significant changes in the length of the pectoralis major, latissimus dorsi, deltoid, teres major, teres minor, coracobrachialis, and biceps brachii muscles are observed for a reference position considered for the upper limb. The shortening of the teres major and teres minor is the most critical since they become unable to produce active force in this position. Substantial changes of muscle moment arms are also observed, which are consistent with the literature. As expected, there is a significant increase of the deltoid moment arms and more fibers are able to elevate the arm. The solutions to the muscle force sharing problem support the biomechanical advantages attributed to the reverse shoulder design and show an increase in activity from the deltoid, teres minor, and coracobrachialis muscles. The glenohumeral joint reaction forces estimated for the reverse shoulder are up to 15% lower than those in the normal shoulder anatomy. The data presented here complements previous publications, which, all together, allow researchers to build a biomechanical model of the upper limb including a reverse shoulder prosthesis.
• Journal of biomechanical engineering.J Biomech Eng.2013 Nov;135(11):111005. doi: 10.1115/1.4025325.
• The reverse shoulder replacement, recommended for the treatment of several shoulder pathologies such as cuff tear arthropathy and fractures in elderly people, changes the biomechanics of the shoulder when compared to the normal anatomy. Although several musculoskeletal models of the upper limb have
• PMID 24008920

• Pectoralis major transfer for subscapular deficiency: anatomical study of the relationship between the transferred muscle and the musculocutaneous nerve.

• Ruiz-Ibán MA, Murillo-González JA, Díaz-Heredia J, Avila-Lafuente JL, Cuéllar R.SourceServicio de COT, Department of Orthopaedic Surgery, Hospital Universitario Ramón y Cajal, Cta Colmenar Km 9.100, 28034, Madrid, Spain. drmri@hotmail.com
• Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA.Knee Surg Sports Traumatol Arthrosc.2013 Sep;21(9):2177-83. doi: 10.1007/s00167-013-2432-0. Epub 2013 Feb 15.
• PURPOSE: Pectoralis major transfer is indicated for irreparable subscapularis tendon tears. One surgical option is transferring the sternal part of the pectoralis major to the humeral insertion of the subscapularis under the conjoined tendon of the coracobrachialis and biceps muscles. The purpose of
• PMID 23412750

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Related Pictures

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★リンクテーブル★

リンク元

「烏口腕筋」

「烏口腕筋」

　　[★]

英

coracobrachialis (K), coracobrachialis muscle

ラ

musculus coracobrachialis

特徴

• 筋腹を筋皮神経が貫く。

起始

• 肩甲骨(烏口突起)

停止

• 上腕骨中部の内側前面

神経

• 筋皮神経

機能

• 肩関節の屈曲