WordNet

cause to be in an appropriate place, state, or relation
a job in an organization; "he occupied a post in the treasury" (同)post, berth, office, spot, billet, place, situation
the arrangement of the body and its limbs; "he assumed an attitude of surrender" (同)posture, attitude
the spatial property of a place where or way in which something is situated; "the position of the hands on the clock"; "he specified the spatial relations of every piece of furniture on the stage" (同)spatial relation
(in team sports) the role assigned to an individual player; "what position does he play?"
the act of positing; an assumption taken as a postulate or axiom
the particular portion of space occupied by something; "he put the lamp back in its place" (同)place
a rationalized mental attitude (同)stance, posture
a way of regarding situations or topics etc.; "consider what follows from the positivist view" (同)view, perspective
the appropriate or customary location; "the cars were in position"
of or relating to a fetus; "fetal development" (同)foetal

PrepTutorEJDIC

〈C〉『位置;場所』;所在地 / 〈U〉所定の位置,適所 / 〈C〉『姿勢』,構え / 〈U〉有利な地位(立場) / 〈C〉《通例単数形で》(周囲の状況と関連する)『立場,境遇』;形勢,情況 / 〈C〉見解,態度 / 〈C〉(…としての)勤め口,職《+『as(of)+名』》 / 〈C〉(…の中の)地位《+『in+名』》 / 〈U〉(特に高い)社会的地位 / 《副詞[句]を伴って》…‘を'適当な(特定の)場所に置く

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/11/08 08:17:39」(JST)

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"Views of a Fetus in the Womb", Leonardo da Vinci, ca. 1510–1512.

Fetal position (British English: also foetal) is the positioning of the body of a prenatal fetus as it develops. In this position, the back is curved, the head is bowed, and the limbs are bent and drawn up to the torso.

This position is used in the medical profession to minimize injury to the neck and chest.

Sometimes, when a person has suffered extreme physical or psychological trauma (including massive stress), they will assume the fetal position or a similar position in which the back is curved forward, the legs are brought up as tightly against the abdomen as possible, the head is bowed as close to the abdomen as possible, and the arms are wrapped around the head to prevent further trauma. This position provides better protection to the brain and vital organs than simply lying spread out on the ground, so it is clear as to why it is an instinctual reaction to extreme stress or trauma when the brain is no longer able to cope with the surrounding environment, and in essence "shuts down" temporarily.

The fetal position has been observed in drug addicts, who enter the position when experiencing withdrawal. Sufferers of anxiety are also known to assume the fetal position during panic attacks.

Many people assume this position when sleeping, especially when the body becomes cold.

A study by Professor Chris Idzikowski, director of the Sleep Assessment and Advisory Service found that people who sleep in the fetal position consistently tend to have a shy and sensitive personality.^[1]

Assuming this position and playing dead is often recommended as a strategy to end a bear attack.^[2]

Many baby mammals, especially rodents, remain in the fetal position well after being born.

The fetal position is also one of the most comfortable and familiar positions to the human, as they remain in the position for the last two trimesters of pregnancy. Babies are most often found stretched out, however, because they do not have full control of their limbs, resulting in flailing and twitching.

References

^ "Sleep position gives personality clue". BBC. 16 September 2003. Retrieved 10 May 2009.
^ "Bear Attacks Their Causes and Avoidance" by Stephen Herrero, pg 24 ISBN 0-941130-82-7

UpToDate Contents

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1. 正常な陣痛および分娩のマネージメント management of normal labor and delivery
2. 胎児の後頭後位 occiput posterior position
3. Transverse fetal lie
4. 後頭横位 occiput transverse position
5. 分娩時の顔位および額位 face and brow presentations in labor

English Journal

ESHRE Task Force on ethics and Law 20: sex selection for non-medical reasons.

Dondorp W, De Wert G, Pennings G, Shenfield F, Devroey P, Tarlatzis B, Barri P, Diedrich K.SourceDepartment of Health, Ethics & Society, Research Institutes CAPHRI and GROW, Maastricht University, Maastricht, The Netherlands.
Human reproduction (Oxford, England).Hum Reprod.2013 Jun;28(6):1448-54. doi: 10.1093/humrep/det109. Epub 2013 Apr 11.
This Task Force document revisits the debate about the ethics of sex selection for non-medical reasons in the light of relevant new technological developments. First, as a result of improvement of the Microsort® flow cytometry method, there is now a proven technique for preconception sex selection
PMID 23578946

Noninvasive prenatal testing/noninvasive prenatal diagnosis: the position of the national society of genetic counselors.

Devers PL, Cronister A, Ormond KE, Facio F, Brasington CK, Flodman P.SourceUniversity of North Carolina, Chapel Hill, NC, USA, pdevers@verinata.com.
Journal of genetic counseling.J Genet Couns.2013 Jun;22(3):291-5. doi: 10.1007/s10897-012-9564-0. Epub 2013 Jan 22.
The 1997 discovery of free fetal DNA in maternal plasma launched clinical researchers' efforts to establish a reliable method for non-invasive prenatal testing for fetal genetic conditions. Various methods, including, but not limited to, massively parallel sequencing (MPS) and selective analysis of
PMID 23334531

Japanese Journal

ISP-11-6 Investigation of fetal head position during labor by intrapartum sonography(Group 11 Perinatology 3,IS Poster,International Session)

Chung Yoo Hyun,Choi Sae Kyung,Ko Hyun Sun,Park In Yang,Shin Jong Chul,Kim Sa Jim
日本産科婦人科學會雜誌 66(2), 950, 2014-02-01
NAID 110009813066

Specific Absorption Rates and Temperature Elevations due to Wireless Radio Terminals in Proximity to a Fetus at Gestational Ages of 13, 18, and 26 Weeks

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IEICE Transactions on Communications E97.B(10), 2175-2183, 2014
… The results indicate that fetal SARs and temperature elevations are closely related to the position of the fetus relative to the EM source. … We also found that, although the fetal SAR caused by a half-wavelength dipole antenna is sometimes comparable to or slightly more than the International Commission Non-Ionizing Radiation Protection guidelines, it is lower than the guideline level in more realistic situations, such as when a planar inverted-F antenna is used. …
NAID 130004696695

Human fetal topographical anatomy of the femoral triangle in relation with change in the hip joint position.

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Okajimas Folia Anatomica Japonica 91(1), 5-12, 2014
… Fetal hip joint is characterized by its highly flexion and lateral rotation although adult anatomy of the femoral nerve and iliofemoral ligament suggested the medial rotation. … Blood supply to the head of the femur might be also accelerated by changes in the hip joint position. …
NAID 130004695956