WordNet

coming next after the third and just before the fifth in position or time or degree or magnitude; "the quaternary period of geologic time extends from the end of the tertiary period to the present" (同)4th, quaternary
following the third position; number four in a countable series
the musical interval between one note and another four notes away from it
relating to or situated in or extending toward the middle (同)medial
the value below which 50% of the cases fall (同)median value
relating to or constituting the middle value of an ordered set of values (or the average of the middle two in a set with an even number of values); "the median value of 17, 20, and 36 is 20"; "the median income for the year was $15,000" (同)average
a chamber of the heart that receives blood from an atrium and pumps it to the arteries (同)heart_ventricle
one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid
being one more than three (同)4, iv
the cardinal number that is the sum of three and one (同)4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe

PrepTutorEJDIC

《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)
《the fourth》『第4の』,4番目の / 4分の1の / {U}《通例the fourth》『第4番目』;(月の)4日 / 〈C〉4分の1 / 〈C〉(音楽で)4度
中央の,中間の / 中間数の,中央値の / (統計・数学で)中間数,中央値;中点
(脳髄・喉頭などの)室,空洞,(心臓の)心室
〈C〉(数の)4;4ノ記号(4,IVなど) / 〈U〉4時,4分;4歳 / 〈U〉《複数扱い》4人,4個 / 〈C〉4個(4人)1組のもの;フォア(4本オールのボートおよびその選手) / 〈C〉(カードの)4の札 / 4の;4人の;4個の / 《補語にのみ用いて》4歳の(で)

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1. まれな脳腫瘍 uncommon brain tumors
2. 左脚中隔枝ブロック left median middle or septal fascicular block
3. 鼻の先天異常 congenital anomalies of the nose
4. 神経膠腫の分類 classification of gliomas
5. 下顎、口、口腔、および咽頭の先天異常 congenital anomalies of the jaw mouth oral cavity and pharynx

English Journal

Median aperture of the fourth ventricle revisited.

Ciołkowski M, Sharifi M, Tarka S, Ciszek B.SourceDepartment of Descriptive and Clinical Anatomy, Medical University of Warsaw, Poland. maciej.ciolkowski@wum.edu.pl
Folia morphologica.Folia Morphol (Warsz).2011 May;70(2):84-90.
BACKGROUND: The median aperture of Magendie is the largest of three openings of the fourth ventricle and thus it forms the main path for the outflow of the cerebrospinal fluid from the ventricle. The Magendie aperture connects the fourth ventricle with the cisterna magna and makes a natural corridor
PMID 21630228

[Microsurgical anatomy and quantitative assessment of suboccipital median transcerebellomedullary fissure keyhole approach].

Li ZQ, Lan Q.SourceDepartment of Neurosurgery, Second Affiliated Hospital, Soochow University, Suzhou 215004, China.
Zhonghua yi xue za zhi.Zhonghua Yi Xue Za Zhi.2009 Oct 27;89(39):2754-8.
OBJECTIVE: To assess the suboccipital median transcerebellomedullary fissure keyhole approach in a cadaver model by using a neuronavigation system and explore its feasibility and operative indications.METHODS: Six 10% formaldehyde-fixed adult cadaveric head and neck specimens injected with colored l
PMID 20137597

Surgical observation of the agenesis of the foramen of Magendie.

Tubbs RS.SourceDepartment of Cell Biology and Surgery/Division of Neurosurgery, Birmingham, Alabama, USA. rstubbs@uab.edu
Folia morphologica.Folia Morphol (Warsz).2006 May;65(2):174-7.
We report a young girl who presented with headache and back pain. Dynamic MRI revealed no cerebrospinal egress from the median aperture (Foramen of Magendie) of the fourth ventricle and syringomyelia. A posterior cranial fossa exploration was performed and agenesis of the median aperture was observe
PMID 16773611