WordNet

of or relating to the chest or thorax; "pectoral organ" (同)thoracic
an adornment worn on the chest or breast (同)pectoral medallion
either of two large muscles of the chest (同)pectoral_muscle, pectoralis, musculus pectoralis, pecs
any bundle of nerve fibers running to various organs and tissues of the body (同)nervus
dividing an animal into right and left halves (同)median
control of your emotions; "this kind of tension is not good for my nerves"

PrepTutorEJDIC

胸の,胸部の / 胸部
〈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
中間の,中間に位置する / 平均の,並なみの
mediumの複数形

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/10/09 20:20:03」(JST)

wiki en

The medial pectoral nerve (medial anterior thoracic) arises from the medial cord (sometimes directly from the anterior division of the inferior trunk) of the brachial plexus and through it from the eighth cervical and first thoracic roots.

It passes behind the first part of the axillary artery, curves forward between the axillary artery and vein, and unites in front of the artery with a filament from the lateral nerve.

It then enters the deep surface of the pectoralis minor muscle, where it divides into a number of branches, which supply the muscle.

Two or three branches pierce the muscle and end in the sternocostal head of the pectoralis major muscle. A mnemonic to differentiate the medial pectoral nerve, which pierces both the pectoralis minor and the sternocostal head of the pectoralis major, from the lateral pectoral nerve, which pierces only the clavicular head of the pectoralis major, is "Lateral Less, Medial More".

Additional images

Brachial plexus
Brachial plexus with courses of spinal nerves shown

References

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

External links

Anatomy photo:05:st-0511 at the SUNY Downstate Medical Center
EatonHand ner-016
MedEd at Loyola GrossAnatomy/dissector/practical/ue/ue15.html

UpToDate Contents

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1. 頭皮、頸部および胴部の神経ブロック：手技 nerve blocks of the scalp neck and trunk techniques
2. 上肢末梢神経症候群の概要 overview of upper extremity peripheral nerve syndromes
3. 腋窩リンパ節郭清の手技 technique of axillary lymph node dissection
4. 成人における肘痛の評価 evaluation of elbow pain in adults
5. 頚部痛および頚椎症の患者の評価 evaluation of the patient with neck pain and cervical spine disorders

English Journal

Multiple unilateral variations in medial and lateral cords of brachial plexus and their branches.

Goel S, Rustagi SM, Kumar A, Mehta V, Suri RK.Author information Department of Anatomy, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, Delhi, India.AbstractDuring routine dissection of the upper extremity of an adult male cadaver, multiple variations in branches of medial and lateral cords of brachial plexus were encountered. Three unique findings were observed. First, intercordal neural communications between the lateral and medial cords were observed. Second, two lateral pectoral nerves and one medial pectoral nerve were seen to arise from the lateral and medial cord respectively. The musculocutaneous nerve did not pierce the coracobrachialis. Finally, the ulnar nerve arose by two roots from the medial cord. Knowledge of such variations is of interest to anatomists, radiologists, neurologists, anesthesiologists, and surgeons. The aim of our study is to provide additional information about abnormal brachial plexus and its clinical implications.
Anatomy & cell biology.Anat Cell Biol.2014 Mar;47(1):77-80. doi: 10.5115/acb.2014.47.1.77. Epub 2014 Mar 13.
During routine dissection of the upper extremity of an adult male cadaver, multiple variations in branches of medial and lateral cords of brachial plexus were encountered. Three unique findings were observed. First, intercordal neural communications between the lateral and medial cords were observed
PMID 24693486

Origin of medial and lateral pectoral nerves from the supraclavicular part of brachial plexus and its clinical importance - a case report.

Shetty P1, Nayak SB2, Kumar N3, Thangarajan R3, D'Souza MR3.Author information 1Associate Professor, Department of Anatomy, Melaka Manipal Medical College, Manipal University , Madhav Nagar, Manipal, Karnataka, India .2Professor and Head, Department of Anatomy, Melaka Manipal Medical College, Manipal University , Madhav Nagar, Manipal, Karnataka, India .3Lecturer, Department of Anatomy, Melaka Manipal Medical College, Manipal University , Madhav Nagar, Manipal, Karnataka, India .AbstractKnowledge of normal and anomalous formation of brachial plexus and its branches is of utmost importance to anatomists, clinicians, anesthesiologists and surgeons. Possibility of variations in the origin, course and distribution of branches of brachial plexus must be kept in mind during anesthetizing the brachial plexus, mastectomy and plastic surgery procedures. In the current case, the medial pectoral nerve arose directly from the middle trunk of the brachial plexus and the lateral pectoral nerve arose from the anterior division of the upper trunk of the brachial plexus. The lateral pectoral nerve supplied the pectoralis major and the medial pectoral nerve supplied pectoralis major and pectoralis minor muscles through two separate branches.
Journal of clinical and diagnostic research : JCDR.J Clin Diagn Res.2014 Feb;8(2):133-4. doi: 10.7860/JCDR/2014/7082.4029. Epub 2014 Feb 3.
Knowledge of normal and anomalous formation of brachial plexus and its branches is of utmost importance to anatomists, clinicians, anesthesiologists and surgeons. Possibility of variations in the origin, course and distribution of branches of brachial plexus must be kept in mind during anesthetizing
PMID 24701504

Medial pectoral pedicle is a reliable landmark for axillary lymph node dissection.

Aripin YM1, Ibrahim N, Muhammad R.Author information 1Department of Surgery, Faculty of Medicine and Health Sciences, Universiti Malaysia Sarawak, Malaysia. Electronic address: mayahya3@yahoo.com.AbstractBACKGROUND: The anatomical orientation of structures in the axilla has not been well studied, although it is essential for a neat and safe dissection. The objective of this study was to determine the relations between neurovascular structures in the axilla as they were encountered during axillary lymph node dissection (ALND) for breast cancer.
Asian journal of surgery / Asian Surgical Association.Asian J Surg.2013 Oct;36(4):150-3. doi: 10.1016/j.asjsur.2013.04.008. Epub 2013 May 28.
BACKGROUND: The anatomical orientation of structures in the axilla has not been well studied, although it is essential for a neat and safe dissection. The objective of this study was to determine the relations between neurovascular structures in the axilla as they were encountered during axillary ly
PMID 23726827

Japanese Journal

筋性腋窩弓とその支配神経について

高藤豊治,守屋厚,横山寿光,神林隆幸,斎藤嘉代,五十嵐純,佐藤泰司
杏林医学会雑誌 21(2), 187-193, 1990-06-30
NAID 110007373981

魚類コイ科の迷路特に球形嚢と聴覚に関する研究

宮崎忠彦
日本耳鼻咽喉科学会会報 69(7), 1237-1250, 1966
… and hearing test was performed by observing the responses to sound, particularly the backing movement of pectoral fins.The response disappeared when the lower portion of the labyrinth was destructed or the swimbladder was ruptured, while the fish responded normally after the destruction of upper portion of the labyrinth, lateral-line organ and the sensory organs of the skin and the extraction of the lateral line nerve.Morphological studies of the fish labyrinth were performed and the remarkable findings were as follows.1) …
NAID 130000803221

「内側胸筋神経」

Medial pectoral nerve
	Nerves of the left upper extremity. (Medial anterior thoracicvisible in upper right.)
Details
Latin	nervus pectoralis medialis
From	medial cord
Innervates	pectoralis minor, pectoralis major
Identifiers
Gray's	p.933
Dorlands; /Elsevier	n_05/12566420
TA	A14.2.03.017
FMA	65293
	Anatomical terms of neuroanatomy