head of radius

WordNet

1. to go or travel towards; "where is she heading"; "We were headed for the mountains"
2. the length or height based on the size of a human or animal head; "he is two heads taller than his little sister"; "his horse won by a head"
3. the pressure exerted by a fluid; "a head of steam"
4. the tip of an abscess (where the pus accumulates)
5. (nautical) a toilet on board a boat or ship
6. (usually plural) the obverse side of a coin that usually bears the representation of a persons head; "call heads or tails!"
7. a projection out from one end; "the head of the nail", "a pinhead is the head of a pin"
8. a single domestic animal; "200 head of cattle"
9. the striking part of a tool; "the head of the hammer"
10. the upper part of the human body or the front part of the body in animals; contains the face and brains; "he stuck his head out the window" (同)caput
11. a person who is in charge; "the head of the whole operation" (同)chief, top_dog
12. (grammar) the word in a grammatical constituent that plays the same grammatical role as the whole constituent (同)head word
13. a rounded compact mass; "the head of a comet"
14. a user of (usually soft) drugs; "the office was full of secret heads"
15. an individual person; "tickets are $5 per head"
16. that part of a skeletal muscle that is away from the bone that it moves
17. the foam or froth that accumulates at the top when you pour an effervescent liquid into a container; "the beer had a large head of foam"
18. the front of a military formation or procession; "the head of the column advanced boldly"; "they were at the head of the attack"
19. the rounded end of a bone that fits into a rounded cavity in another bone to form a joint; "the head of the humerus"
20. the top of something; "the head of the stairs"; "the head of the page"; "the head of the list"
21. be the first or leading member of (a group) and excel; "This student heads the class" (同)head up
22. be in charge of; "Who is heading this project?" (同)lead
23. be in the front of or on top of; "The list was headed by the name of the president"
24. form a head or come or grow to a head; "The wheat headed early this year"
25. remove the head of; "head the fish"
26. take its rise; "These rivers head from a mountain range in the Himalayas"
27. of leafy vegetables; having formed into a head; "headed cabbages"
28. having a head of a specified kind or anything that serves as a head; often used in combination; "headed bolts"; "three-headed Cerberus"; "a cool-headed fighter pilot"
29. having a heading or caption; "a headed column"; "headed notepaper"
30. having a heading or course in a certain direction; "westward headed wagons"
31. a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
32. the length of a line segment between the center and circumference of a circle or sphere (同)r
33. a circular region whose area is indicated by the length of its radius; "they located it within a radius of 2 miles"
34. the outer and slightly shorter of the two bones of the human forearm
35. the 5th letter of the Hebrew alphabet

PrepTutorEJDIC

1. (顔を含めた)『頭』,頭部,首;(髪の生えている部分の)頭 / 『頭脳』,頭の働き,知力,才能;理性 / 『長』,指導者,支配者 / (ある物の)頭,上部,先端,先頭 / (川・泉の)源,水源 / (人・動物の)頭数,一人,1頭 / 『首席』,首位 / 《複数形で》(頭像のある)貨幣の表 / 項目,表題(新聞の)見出し / 《米俗》マリファナ常用者 / 長の,指導者の / …‘の'先頭に立つ,‘を'率いる;…‘の'長である / (…の方へ)…‘を'向ける《+『名』+『for』(『toward』)+『名』》 / (サッカーで)〈ボール〉‘を'頭で受ける,ヘディングする / (…に向かって)進む《+for(toward)+名》・「give a head」で「オーラルセックスをする・相手の性器をなめる」
2. 《所有・所属》…『の』,…のものである,…に属する・《材料・要素》…『でできた』,から成る・《部分》…『の』[『中の』] ・《数量・単位・種類を表す名詞に付いて》…の・《原因・動機》…『で』,のために(because of) ・《主格関係》…『の』,による,によって・《目的格関係》…『を』,の・《同格関係》…『という』・《関係・関連》…『についての』[『の』],の点で・《抽象名詞などと共に》…の[性質をもつ] ・《『It is』+『形』+『of』+『名』+『to』 doの形で,ofの後の名詞を意味上の主語として》・《分離》…『から』・《起原・出所》…『から』[『の』](out of) ・《『名』+『of』+『a』(『an』)+『名』の形で》…のような・《『名』+『of』+『mine』(『yours, his』など独立所有格)の形で》…の…・《時》(1)《副詞句を作って》…に《形容詞句を作って》…の・《時刻》《米》…前(to,《米》before)
3. 頭[部]のある,見出しのある / (キャベツなどが)結球した / 《複合語を作って》「…の頭を持つ」「頭が…の」の意を表す
4. 半径 / (行動・活動・能力なのどの)及ぶ範囲《+『of』+『名』》 / 橈骨(とうこつ)(上腕の骨の一つ)
5. 彼は,彼が / 《指す人の性別が分からないか,または分かる必要のない場合に》その人,あの人,自分 / 《he who(that)の形で》《文》…するものはだれでも / (動物の)おす(雄)
6. 鬼ごっこ(tag,tick,tig)

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/07/11 19:19:24」(JST)

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Head of radius
The radius and ulna of the left forearm, posterior surface. The top is proximal (elbow) and bottom is distal (wrist).
Details
Latin	Caput radii
Identifiers
Gray's	p.1
Dorlands /Elsevier	c_08/12212240
TA	A02.4.05.002
FMA	33773
Anatomical terms of bone

The head of the radius has a cylindrical form, and on its upper surface is a shallow cup or fovea for articulation with the capitulum of the humerus. The circumference of the head is smooth; it is broad medially where it articulates with the radial notch of the ulna, narrow in the rest of its extent, which is embraced by the annular ligament.

Articular surfaces

The head of the radius is shaped to articulate with a complex of articular surfaces during both flexion-extension at the elbow and supination-pronation in the forearm:

Humeroradial joint

Main article: Humeroradial joints

The head's proximal surface is concave and cup-shaped to correspond to the spherical surface of the capitulum of the humerus. The radius can thus glide on the capitulum during elbow flexion-extension while simultaneously rotate about its own main axis during supination-pronation.

Between the capitulum and the trochlea of the humerus is the capitulotrochlear groove. A semi-lunar surface around the circumference of head is shaped to articulate continuously with this groove.

The capitulum does not extend to the posterior side of the humerus and, consequently, during full elbow extension only the anterior half of the head articulates with the capitulum. In full flexion the head similarly reaches beyond the capitulum to enter the shallow radial fossa on the anterior side of the humerus.

Proximal radioulnar joint

Main article: Proximal radioulnar joint

The head is cylindrical to allow axial rotation of the radius, thus to articulate with the annular ligament and the radial notch on the ulna.

However, the head of the radius is not perfectly cylindrical but slightly oval. In anatomical position, its major axis (28 mm (1.1 in)) is directed antero-posteriorly and the shorter axis (24 mm (0.94 in)) lateralo-medially. Even though the annular ligament holds the head firmly in place, the ligament is still flexible enough to allow some stretching while the head rotates within it.

During pronation the radius is rotated so that the head's major axis reaches the radial notch on the ulna. This causes a small but significant lateral displacement of the radius' main axis — equal to half the difference between the two axes of the head (2 mm (0.079 in)) — just enough space to accommodate the radial tuberosity as it being moved medially.

Additional images

• Elbow joint. Deep dissection. Posterior view.

• Elbow joint. Deep dissection. Posterior view.

• Elbow joint. Deep dissection. Posterior view.

See also

• Nursemaid's elbow

References

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

UpToDate Contents

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• 4. 成人における橈骨頭および橈骨頚部の骨折 radial head and neck fractures in adults
• 5. Midshaft ulna and radius fractures in adults

English Journal

• Ulnar lengthening using a half-ring sulcated external fixator for ulnar longitudinal deficiency: a case report.

• Chen GX, Zhou ZA, Yang L.SourceCentre for Joint Surgery, Southwest Hospital, Chongqing, 400038, China, cgx7676@hotmail.com.
• Cell biochemistry and biophysics.Cell Biochem Biophys.2013 Nov;67(2):809-12. doi: 10.1007/s12013-013-9566-z.
• Ulnar longitudinal deficiency (ULD) is a rare condition of the upper limbs. Although radius lengthening for radial longitudinal deficiencies (RLD) was found to be successful, no ulnar lengthening for ULD without RLD and hand deformities has been reported. Herein, we present a Bayne type II ULD case
• PMID 23504634

• What is normal femoral head/neck anatomy? An analysis of radial CT reconstructions in adolescents.

• Jamali AA, Mak W, Wang P, Tai L, Meehan JP, Lamba R.SourceJoint Preservation Institute, Orthopaedic Surgery, 2825 J Street, #440, Sacramento, CA, 95816, USA, contactus@jointpreservationinstitute.com.
• Clinical orthopaedics and related research.Clin Orthop Relat Res.2013 Nov;471(11):3581-7. doi: 10.1007/s11999-013-3166-5. Epub 2013 Aug 7.
• BACKGROUND: Cam morphology in femoroacetabular impingement has been implicated in the development of osteoarthritis. The alpha angle and femoral head/neck offset are widely used to determine femoral head asphericity. To our knowledge, no study has evaluated the alpha angle circumferentially using th
• PMID 23922189

Japanese Journal

• 河床砂礫の透水性の測定とそれに基づく浸透特性の評価

• 森井 俊広,小越 将仁,鈴木 哲也 [他],河合 隆行,Morii Toshihiro,Okoshi Masahito,Suzuki Tetsuya,Kawai Takayuki
• 新潟大学農学部研究報告 66(1), 49-55, 2013-10
• … Hydraulic stability of river weirs (head works) is dominated by hydraulic gradient and uplift pressure caused by seepage flow through riverbed sediment under the weir. … To predict the seepage flow through the riverbed sediment, permeability or transmissibility of the riverbed sediment consisting of sand and gravel should be measured properly. …
• NAID 120005345545

• 橈骨近位端骨折に対する手術法 : 骨頭骨折と頭頚部骨折との比較検討 (特集 肘関節周辺骨折手術治療の最前線)

• 池田 樹広,寺浦 英俊,坂中 秀樹 [他]
• 整形・災害外科 56(8), 937-943, 2013-07
• NAID 40019742748

Related Links

• HEAD-JAPAN

伊藤忠商事スポーツ用品HEADのページ。HEADのスキー、スノーボード、テニスなどのギア商品へのリンクとスポーツウェア、カジュアルウェアなどのアパレル商品へのリンク。

• Excision of Radial Head - Wheeless' Textbook of Orthopaedics

- Discussion: - descision to excise the head of the radius depends associated elbow injuries as well as severity of radial head frx; - it has been determined that the stabilizing effect of radial head comes into play only when the MCL ...

Related Pictures

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★リンクテーブル★

リンク元	「橈骨頭」
関連記事	「heading」「head」

「橈骨頭」

　　[★]

英

head of radius (KL)

ラ

caput radii

関

橈骨

• 橈骨頭の近位端は上腕骨小頭と関節し、橈骨頭の側面は尺骨の橈骨切痕と関節する。

Henry Gray (1825-1861). Anatomy of the Human Body. 1918.

「heading」

　　[★]

• n.

• 頭付け。頭部、上部、正面。(ページ・章の)標題、(小)見出し。項、節。(船首などの)方向、飛行方向/方位。首切り

　 　

「head」

　　[★]

• n.

• 頭部、頭