WordNet

of your secondary field of academic concentration or specialization
limited in size or scope; "a small business"; "a newspaper with a modest circulation"; "small-scale plans"; "a pocket-size country" (同)modest, small, small-scale, pocket-size, pocket-sized
not of legal age; "minor children" (同)nonaged, underage
warranting only temporal punishment; "venial sin" (同)venial
inferior in number or size or amount; "a minor share of the profits"; "Ursa Minor"
lesser in scope or effect; "had minor differences"; "a minor disturbance"
of a scale or mode; "the minor keys"; "in B flat minor"
of lesser importance or stature or rank; "a minor poet"; "had a minor part in the play"; "a minor official"; "many of these hardy adventurers were minor noblemen"; "minor back roads"
of lesser seriousness or danger; "suffered only minor injuries"; "some minor flooding"; "a minor tropical disturbance"
of the younger of two boys with the same family name; "Jones minor"
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

PrepTutorEJDIC

『小さいほうの,少ない』 / (階級・地位・重要性などが)『劣ったほうの』,重要でない / 重大ではない / 未成年の / (音楽で)短調の / 未成年者 / (大学の科目・課程の)副専攻科目 / (音楽で)短調 / 《the minors》《米》=minor league
胸の,胸部の / 胸部

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/08/31 02:08:02」(JST)

wiki en

The pectoralis minor (/ˌpɛktəˈreɪlɨs ˈmaɪnər/) is a thin, triangular muscle, situated at the upper part of the chest, beneath the pectoralis major in the human body.

Structure

It arises from the upper margins and outer surfaces of the third, fourth, and fifth ribs, near their cartilages and from the aponeuroses covering the intercostalis.

The fibers pass superior and lateral and converge to form a flat tendon, which is inserted into the medial border and upper surface of the coracoid process of the scapula.

Relations

The pectoralis minor muscle is covered anteriorly (superficially) by the clavipectoral fascia. The Lateral pectoral nerve pierces the pectoralis minor and the clavipectoral fascia. In attaching to the coracoid process, the pectoralis minor forms a 'bridge' - structures passing into the upper limb from the thorax will pass directly underneath.^[1]

Axillary nodes are classified according to their positions relative to the pectoralis minor muscle. Level 1 are lateral, Level 2 are deep, Level 3 are medial. The pectoralis minor divides the axillary artery into three parts.

Variations

An individual with an axillary arch as well as sternalis muscle and an accessory abdominal portion of the pectoralis major.

The origin is from the second, third and fourth or fifth ribs. The tendon of insertion may extend over the coracoid process to the greater tubercle. It may be split into several parts. Absence of this muscle is rare but happens with certain uncommon diseases.^{[citation needed]}

Function

The pectoralis minor depresses the point of the shoulder, drawing the scapula inferior, towards the thorax, and throwing its inferior angle posteriorly.

Additional images

Position of pectoralis minor muscle (shown in red).
Right pectoralis minor muscle. Deep dissection.

References

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

^ http://www.teachmeanatomy.com/muscles-of-the-pectoral-region/

External links

Illustration: upper-body/pectoralis-minor from The Department of Radiology at the University of Washington
13631566 at GPnotebook
Anatomy figure: 04:04-05 at Human Anatomy Online, SUNY Downstate Medical Center
Anatomy figure: 05:02-08 at Human Anatomy Online, SUNY Downstate Medical Center
Anatomy photo:05:ov-0200 at the SUNY Downstate Medical Center
Anatomy photo:05:01-0102 at the SUNY Downstate Medical Center
Slide
Muscles/PectoralisMinor at exrx.net

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English Journal

Motor point map of upper body muscles.

Behringer M1, Franz A, McCourt M, Mester J.
European journal of applied physiology.Eur J Appl Physiol.2014 Apr 29. [Epub ahead of print]
PURPOSE: The purpose of the present study was to systematically investigate the upper body motor point (MP) positions of selected muscles and to create an atlas of the identified MPs.METHODS: MPs were searched bilaterally in 15 male and 15 female subjects by scanning the skin with a special pen elec
PMID 24777738

The role of pectoralis major and latissimus dorsi muscles in a biomechanical model of massive rotator cuff tear.

Campbell ST1, Ecklund KJ2, Chu EH1, McGarry MH1, Gupta R2, Lee TQ3.
Journal of shoulder and elbow surgery / American Shoulder and Elbow Surgeons ... [et al.].J Shoulder Elbow Surg.2014 Feb 20. pii: S1058-2746(13)00605-8. doi: 10.1016/j.jse.2013.11.030. [Epub ahead of print]
BACKGROUND: Superior migration of the humeral head after massive rotator cuff tear (mRCT) is thought to lead to cuff tear arthropathy. Previous biomechanical studies have demonstrated the ability of the pectoralis major and latissimus dorsi (PM/LD) muscles to resist this migration. This study examin
PMID 24560467

Anatomic relationship of the pectoralis major and minor muscles: a cadaveric study.

Sanchez ER1, Sanchez R, Moliver C.
Aesthetic surgery journal / the American Society for Aesthetic Plastic surgery.Aesthet Surg J.2014 Feb;34(2):258-63. doi: 10.1177/1090820X13519643. Epub 2014 Jan 8.
BACKGROUND: Although the anatomy of the individual pectoralis major and minor muscles has been described previously, never before has the anatomic relationship between these muscles been investigated.OBJECTIVE: The authors identify the anatomic relationship of the costal origins of the pectoralis ma
PMID 24402060

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★リンクテーブル★

リンク元	「小胸筋」
関連記事	「minor」「pectoral」「pectoralis」

「小胸筋」

Pectoralis minor
	Pectoralis minor (shown in red).
	Pectoralis minor muscle (shown in red). The bone shown in blue is shoulder blade.
Details
Latin	Musculus pectoralis minor
Origin	Third to fifth ribs, near their costal cartilages
Insertion	Medial border and superior surface of the coracoid process of the scapula
Artery	Pectoral branch of the thoracoacromial trunk
Nerve	Medial pectoral nerve (C8, T1)
Actions	Stabilizes the scapula by drawing it inferiorly and anteriorly against the thoracic wall, raises ribs in inspiration
Identifiers
Gray's	p.438
Dorlands; /Elsevier	m_22/12550138
TA	A04.4.01.006
FMA	13109
	Anatomical terms of muscle