coracobrachialis

烏口腕筋

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/08/02 19:48:23」(JST)

wiki en

[Wiki en表示]

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
Gray's	p.443
Dorlands /Elsevier	m_22/12548663
TA	A04.6.02.017
FMA	37664
Anatomical terms of muscle

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. 二頭筋腱障害および腱断裂 biceps tendinopathy and tendon rupture
• 2. 末梢神経ブロック：手技 peripheral nerve block techniques
• 3. 上肢末梢神経症候群の概要 overview of upper extremity peripheral nerve syndromes
• 4. 肩の運動器超音波 musculoskeletal ultrasound of the shoulder

English Journal

• Morphology and clinical significance of the distribution of the median nerve within the arm of human cadavers.

• Nasr AY.SourceAnatomy Department, King Abdulaziz University, PO Box 80205, Jeddah 21589, Kingdom of Saudi Arabia. Tel. +966 (2) 6401000 Ext. 20477. Fax. +966 (2) 4601000 Ext. 20121. E-mail: ashrafnaeem2012@yahoo.com.
• Neurosciences (Riyadh, Saudi Arabia).Neurosciences (Riyadh).2012 Oct;17(4):336-44.
• OBJECTIVE: To describe the patterns of formation, level of beginning, variations of course, and relation of the median nerve within the arm of human cadavers.METHODS: Sixty upper limbs of 20 male and 10 female adult human cadavers were used in this study. The cadavers were obtained from the Anatomy
• PMID 23022898

• Bilateral absence of musculocutaneous nerve with unusual branching pattern of lateral cord and median nerve of brachial plexus.

• Bhanu PS, Sankar KD.SourceDepartment of Anatomy, Narayana Medical College, Nellore, Andhra Pradesh, India.
• Anatomy & cell biology.Anat Cell Biol.2012 Sep;45(3):207-10. doi: 10.5115/acb.2012.45.3.207. Epub 2012 Sep 30.
• A 43-year-old female cadaver showed a complete bilateral absence of the musculocutaneous nerve. The anterior compartment muscles of both arms were supplied by median nerve excepting the coracobrachialis which was innervated by a direct branch from the lateral cord of brachial plexus. The median nerv
• PMID 23094210

Japanese Journal

• 野球オーバーハンド投球における上肢・上肢帯筋活動の表面筋電図分析

• 斎藤 健治,松尾 知之,宮崎 光次
• 体育學研究 51(3), 351-365, 2006-05-10
• … EMG was recorded from 25 portions of 16 muscles: the long and short head of the biceps brachii, the coracobrachialis, the brachialis, the lateral, medial and long head of the triceps brachii, the anterior, middle and posterior deltoid, the sternocostalis of the pectoralis major, the latissimus dorsi, the upper, middle and lower trapezius, three portions of the serratus anterior, the pronator teres, the flexor carpi radialis, the flexor carpi ulnalis, the extensor carpi radialis, the extensor digitorum, the extensor carpi ulnalis, and the …
• NAID 110004731817

• 野球オーバーハンド投球における上肢・上肢帯筋活動の表面筋電図分析

• 斎藤 健治,松尾 知之,宮崎 光次
• 体育学研究 51(3), 351-365, 2006
• … EMG was recorded from 25 portions of 16 muscles: the long and short head of the biceps brachii, the coracobrachialis, the brachialis, the lateral, medial and long head of the triceps brachii, the anterior, middle and posterior deltoid, the sternocostalis of the pectoralis major, the latissimus dorsi, the upper, middle and lower trapezius, three portions of the serratus anterior, the pronator teres, the flexor carpi radialis, the flexor carpi ulnalis, the extensor carpi radialis, the extensor digitorum, the extensor carpi ulnalis, and the …
• NAID 130004489521

• Variant Innervation of the Coracobrachialis Muscle and Unusual Course of the Musculocutaneous Nerve in Man

• GUMUSALAN Yakup,YAZAR Fatih,OZAN Hasan
• 解剖學雜誌 73(3), 269-272, 1998-06-01
• NAID 10004991678

Related Links

• 烏口腕筋 - Wikipedia

Coracobrachialis.png. Deep muscles of the chest and front of the arm, with the boundaries of the axilla. Coracobrachialis is shown in blue. Gray1231.png. Front of right upper extremity. (Coracobrachialis labeled at right, fourth from the bottom. ).

• Coracobrachialis — UW Radiology

Origin, Tip of coracoid process of scapula. Insertion, Middle third of medial surface of humerus. Action, Helps to flex and adduct arm. Innervation, Musculocutaneous nerve (C5, C6 and C7) (C5, C6, C7). Arterial Supply, Muscular branches of ...

Related Pictures

---

★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