上肢帯 shoulder pectoral

WordNet

push with the shoulders; "He shouldered his way into the crowd"
a narrow edge of land (usually unpaved) along the side of a road; "the car pulled off onto the shoulder" (同)berm
the part of a garment that covers or fits over the shoulder; "an ornamental gold braid on the shoulder of his uniform"
a ball-and-socket joint between the head of the humerus and a cavity of the scapula (同)shoulder_joint, articulatio humeri
a cut of meat including the upper joint of the foreleg
the part of the body between the neck and the upper arm
carry a burden, either real or metaphoric; "shoulder the burden"
lift onto ones shoulders
put a girdle on or around; "gird your loins" (同)gird
a band of material around the waist that strengthens a skirt or trousers (同)cincture, sash, waistband, waistcloth
an encircling or ringlike structure
cut a girdle around so as to kill by interrupting the circulation of water and nutrients; "girdle the plant" (同)deaden
bind with something round or circular (同)encircle
having shoulders or shoulders as specified; usually used as a combining form; "stoop-shouldered"; "broad-shouldered"

PrepTutorEJDIC

《時制の一致によるshallの過去形》・《単純未来》・《意志未来》・《義務・当然・勧誘》・《should+原形》『すべきである』,するのが当然である,しなくてはならない・《should have+過去分詞》 …『すべきだった[のに]』,するのが当然であった[のに] ・《見込み・当然の結果》・《should+原形》 …『のはずである』,きっと…だろう・《should have+過去分詞》 …『して[しまって]いる(した)はずだ』,きっと…してしまっているだろう・《疑問詞とともに用いて,意外・不可解・驚きなど》『いったい…かしら』・《仮定条件に対する帰結節に用いて》・《一人称主語とともに》《現在または未来に反する仮定に対して》…『だろうに』,なのだが:《should have+過去に反する仮定に対して》 …『だったろうに』,したのだが・《二,三人称主語とともに》…させるのだが,したのだが・《条件節・譲歩節に用いて》『万一…だとしたら』(だとしても) ・《一人称主語とともに用いて,控え目で遠回しな表現として》…『したいが』,…するところが・《感情・判断などの表現に続くthat節に用いて》 …『するとは』,だなんて・《命令・提案・願望などの表現に続くthat節に用いて》 …『するように』,であることを / ・《目的を表す副詞節に用いて》 …する[ように];…しない[ように],してはいけない[から]
『肩』;《複数形で》(両肩を含む)上背部 / 《複数形で》(責任・重荷を負う)『双肩』,責任を負う能力 / 『肩に似た部分』;(服の)肩[の部分];(山などの)肩;(道路の)肩 / 肩肉 / …‘を'肩で押す / 〈物〉‘を'かつぐ,背負う / 肩で押す,肩で押し分けて進む
(腰に着ける)ベルト,ひも,飾り帯 / ガードル(特に婦人用のゴム入りコルセット) / 《文》帯状に取り巻くもの / …‘を'帯で締める,帯で巻く / …‘を'取り巻く,囲む
〈帯など〉‘を'締める;(帯などで)〈腰など〉‘を'巻く《+『名』+『with』+『名』》 / (…で)…‘を'取り巻く,囲む《+『名』+『with』(『by』)+『名』》 / (…に)〈自分〉‘を'身構えさせる《+one『self for』+『名』》;(…しようと)〈自分〉‘を'構える《+one『self to』 do》

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/03/14 16:31:07」(JST)

wiki en

The pectoral girdle or shoulder girdle is the set of bones which connects the upper limb to the axial skeleton on each side. It consists of the clavicle and scapula in humans and, in those species with three bones in the pectoral girdle, the coracoid. Some mammalian species (e.g. the dog and the horse) have only the scapula.

In humans, the only true anatomical joints between the shoulder girdle and axial skeleton are the sternoclavicular joints on each side. No anatomical joint exists between each scapula and the rib cage; instead the muscular connection or physiological joint between the two permits great mobility of the shoulder girdle compared to the compact pelvic girdle — i.e. because the upper limb is not usually involved in weight bearing, its stability has been sacrificed in exchange for greater mobility.

In those species having only the scapula, no joint exists between the forelimb and the thorax, the only attachment being muscular.

Human anatomy

Joints

The pectoral girdle is a complex of five joints that can be divided into two groups. Three of these joints are true anatomical joints while two are physiological ("false") joints.^{[explain 1]} Within each group, the joints are mechanically linked so that both groups simultaneously contribute to the different movements of the shoulder to variable degrees. ^[1]

In the first group, the scapulohumeral or glenohumeral joint is the anatomical joint mechanically linked to the physiological subdeltoid or suprahumeral joint (the "second shoulder joint") so that movements in the latter results in movements in the former. In the second group, the scapulocostal or scapulothoracic joint is the important physiological joint that can not function without the two anatomical joints in the group, the acromioclavicular and sternoclavicular joints, i.e. the joints at both ends of the clavicle. ^[1]

Glenohumeral joint

The glenohumeral joint is the articulation between the head of the humerus and the glenoid cavity of the scapula. It is a ball and socket type of synovial joint. The glenohumeral joint allows for adduction, abduction, medial and lateral rotation, flexion and extension of the arm.

Acromioclavicular joint

The acromioclavicular joint is the articulation between the acromion process of the scapula and the lateral end of the clavicle. It is a plane type of synovial joint. The acromion of the scapula rotates on the acromial end of the clavicle.

Sternoclavicular joint

The sternoclavicular joint is the articulation of the manubrium of the sternum and the first costal cartilage with the medial end of the clavicle. It is a saddle type of synovial joint but functions as a plane joint. The sternoclavicular joint accommodates a wide range of scapula movements and can be raised to a 60° angle during elevation of the scapula.

Scapulocostal joint

The scapulocostal joint (also known as the scapulothoracic joint) is a physiological joint formed by an articulation of the anterior scapula and the posterior thoracic rib cage. It is musculotendinous in nature and is formed predominantly by the trapezius, rhomboids and serratus anterior muscles. The pectoralis minor also plays a role in its movements. The gliding movements at the scapulocostal joint are elevation, depression, retraction, protraction and superior and inferior rotation of the scapula.

Suprahumeral joint

The suprahumeral joint (also known as the subacromial joint) is a physiological joint formed by an articulation of the coracoacromial ligament and the head of the humerus. It is formed by the gap between the humerus and the acromion process of the scapula. This space is filled mostly by the subacromial bursa and the tendon of supraspinatus. This joint plays a role during complex movements while the arm is fully flexed at the glenohumeral joint, such as changing a lightbulb, or painting a ceiling.

Movements

From its neutral position, the pectoral girdle can be rotated about an imaginary vertical axis at the medial end of the clavicle (the sternoclavicular joint). Throughout this movement the scapula is rotated around the chest wall so that it moves 15 centimetres (5.9 in) laterally and the glenoid cavity is rotated 40–45° in the horizontal plane. When the scapula is moved medially it lies in a frontal plane with the glenoid cavity facing directly laterally. At this position, the lateral end of the clavicle is rotated posteriorly so that the angle at the acromioclavicular joint opens up slightly. When the scapula is moved laterally it lies in a sagittal plane with the glenoid cavity facing anteriorly. At this position, the lateral end of the clavicle is rotated anteriorly so that the clavicle lies in a frontal plane. While this slightly closes the angle between the clavicle and the scapula, it also widens the shoulder. ^[2]

The scapula can be elevated and depressed from the neutral position to a total range of 10 to 12 centimetres (3.9 to 4.7 in); at its most elevated position the scapula is always tilted so that the glenoid cavity is facing superiorly. During this tilting, the scapula rotate to a maximum angle of 60° about an axis passing perpendicularly through the bone slightly below the spine; this causes the inferior angle to move 10 to 12 centimetres (3.9 to 4.7 in) and the lateral angle 5 to 6 centimetres (2.0 to 2.4 in). ^[2]

Evolutionary variation

The pectoral girdle demonstrates an enormous variation in amniotes (animals adapted to a terrestrial life), both among extant species and along evolutionary lines, and determining homologies for individual pectoral elements is difficult. Except for the sternum, these elements were, however, present in early bony fishes before there were even limbs. In digitless tetrapods the cleithrum, clavicle, and interclavicle are dermal and linked to the caudal part of the head while the humerus articulates with a small scapulocoracoid bone. As the first digits appeared, the pectoral structure lost its direct connection to the head skeleton while the scapulocoracoid grew more prominent and started to face laterally. In more derived tetrapods the dermal part of the girdle was gradually reduced and the scapulocoracoid split into a dorsal scapula and a ventral coracoid. ^[3]

Explanations

^ Physiological joints are called "false" joints because they lack the characteristics of "true" anatomcial joints, such as ligaments and a capsule, but they are still joints because the gliding movements they provide play an important biomechanical role. (Roy 2009, Focused anatomy)

Notes

^ ^a ^b Kapandji 1982, p. 20
^ ^a ^b Kapandji 1982, p. 40
^ Vickaryous & Hall 2006, Introduction, see also Fig. 1

References

Kapandji, Ibrahim Adalbert (1982). The Physiology of the Joints: Volume One Upper Limb (5th ed.). New York: Churchill Livingstone.
Roy, André (June 2009). "Rotator Cuff Disease Clinical Presentation". MedScape. http://emedicine.medscape.com/article/328253-clinical. Retrieved July 2011.
Vickaryous, Matthew K; Hall, Brian K (March 2006). "Homology of the reptilian coracoid and a reappraisal of the evolution and development of the amniote pectoral apparatus". Journal of Anatomy 208 (3): 263–285. doi:10.1111/j.1469-7580.2006.00542.x.

UpToDate Contents

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2. 肢帯型筋ジストロフィー limb girdle muscular dystrophy
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5. 肩部の身体診察 physical examination of the shoulder

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Close M, Cundall D.SourceDepartment of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania 18015. mclose@lehigh.edu.
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Evolution and development of the vertebrate neck.

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