¼±Åà - È­»ìǥŰ/¿£ÅÍŰ ´Ý±â - ESC

 
"circulus venosus ridleyi"¿¡ ´ëÇÑ °Ë»ö °á°úÀÔ´Ï´Ù. °Ë»ö °á°ú º¸´Â µµÁß¿¡ Tab ۸¦ ´©¸£½Ã¸é °Ë»ö âÀÌ ¼±Åõ˴ϴÙ.
´ëÇÑÀÇÇù ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 3 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
  • circulus
    ¿ø, °í¸®
  • ductus venosus
    Á¤¸Æ°ü
  • sinus venosus
    Á¤¸Æ±¼, Á¤¸Æµ¿
´ëÇÑÀÇÇù Çʼö ÀÇÇпë¾îÁý »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 1 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
  • ductus venosus
    Á¤¸Æ°ü
¿¾ ´ëÇÑÀÇÇù ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 1 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
  • circulus
    (¢¡circle) ¿ø, °í¸®
¿¾ ´ëÇÑÀÇÇù 2 ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 7 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
  • plexus venosus areolaris ³ª
    Á¥¹«¸®Á¤¸Æ¾ó±â, À¯·ûÁ¤¸ÆÃÑ(êáëÌð¡Øæõ¿).
  • plexus venosus canalis hypoglossi ³ª
    ¼³ÇϽŰæ°üÁ¤¸Æ¾ó±â, ¼³ÇϽŰæ°üÁ¤¸Æ ÃÑ(àßù»ãêÌèÎ·ð¡Øæõ¿).
  • plexus venosus caroticus internus ³ª
    ¸ñµ¿¸Æ°ü½Å°æ¾ó±â, °æµ¿¸Æ°üÁ¤¸ÆÃÑ( ÔÑØæÎ·ð¡Øæõ¿).
  • plexus venosus foraminis ovalis ³ª
    Ÿ¿ø±¸¸ÛÁ¤¸Æ¾ó±â, ³­¿ø°øÁ¤¸ÆÃÑ(Õ°ê­Íî ð¡Øæõ¿).
  • plexus venosus foraminis ovalis ³ª
    Ÿ¿ø
  • plexus venosus prostaticus ³ª
    Àü¸³»ùÁ¤¸Æ¾ó±â, Àü¸³¼±Á¤¸ÆÃÑ(îñí¡àÍð¡Øæõ¿) .
  • primordium of sinus venosus
    Á¤¸Æµ¿±¼¿ø±â
¿¾ ´ëÇÑÀÇÇù 3 ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 15 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
  • cerebral arterial circle ; circulus arteriosus cerebri
    ´ë³úµ¿¸Æ°í¸®.
  • circulus vitiosus<³ª>
    ¾Ç¼øÈ¯(ç÷âàü»).
  • circulus<³ª>
    °í¸®, °í¸®¸ð¾çÀÇ, À±, À±»ó.
  • arcus venosus dorsalis pedis<³ª>
    ¹ßµî Á¤¸Æ ±Ã, Á·¹è Á¤¸Æ ±Ã(ðëÛÎð¡ØæÏá).
  • arcus venosus juguli<³ª>
    °æÁ¤¸Æ±Ã(°æÁ¤¸Æ±Ã).
  • arcus venosus palmaris profundus<³ª>
    ±íÀº ¼Õ¹Ù´Ú Á¤¸Æ±Ã, ½ÉÀå Á¤¸Æ ±Ã(ä¢íæð¡ØæÏá).
  • arcus venosus palmaris superficialis
    ¾èÀº ¼Õ¹Ù´Ú Á¤¸Æ±Ã, õÀå Á¤¸Æ ±Ã(ô¼íæð¡ØæÏá).
  • ductus venosus
    Á¤¸Æ°ü
  • ductus venosus
    Á¤¸Æ°ü(ð¡ØæÎ·)
  • ductus venosus
    (Á¤¸Æ°ü)
  • ductus venosus<³ª>
    Á¤¸Æ°ü(Á¤¸Æ°ü).
  • ductus venosus<³ª>
    Á¤¸Æ°ü(ð¡ØæÎ·).
  • plexus venosus areolaris ³ª
    Á¥¹«¸®Á¤¸Æ¾ó±â, À¯·ûÁ¤¸ÆÃÑ(êáëÌð¡Øæõ¿).
  • plexus venosus canalis hypoglossi ³ª
    ¼³ÇϽŰæ°üÁ¤¸Æ¾ó±â, ¼³ÇϽŰæ°üÁ¤¸Æ ÃÑ(àßù»ãêÌèÎ·ð¡Øæõ¿).
  • plexus venosus caroticus internus ³ª
    ¸ñµ¿¸Æ°ü½Å°æ¾ó±â, °æµ¿¸Æ°üÁ¤¸ÆÃÑ( ÔÑØæÎ·ð¡Øæõ¿).
´ëÇÑÇØºÎÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 5 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
  • Valve of sinus venosus
    Á¤¸Æµ¿±¼ÆÇ¸·
    [¿¾ ¿ë¾î] Á¤¸Æµ¿ÆÇ
  • Sinus venosus
    Á¤¸Æµ¿±¼
    [¿¾ ¿ë¾î] Á¤¸Æµ¿
  • Primordium of sinus venosus
    Á¤¸Æµ¿±¼¿ø±â
    [¿¾ ¿ë¾î] Á¤¸Æµ¿¿ø±â
  • Ductus venosus
    (Á¤¸Æ°ü)
    [¿¾ ¿ë¾î] Á¤¸Æ°ü
  • Ductus venosus
    Á¤¸Æ°ü
    [¿¾ ¿ë¾î] Á¤¸Æ°ü
KI ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 2 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
  • ductus venosus
    Á¤¸Æ°ü
  • sinus venosus
    Á¤¸Æµ¿
KMLE ÀÇÇоà¾î »çÀü À¯»ç °Ë»ö °á°ú : 3 ÆäÀÌÁö: 1
ASD Atrial Septal Defect
  Types of ASD
  1. Ostium Primum ASD
  ...
DV dependent variable; diagnostic variable; difference in volume; digital vibration; dilute volume; dis...
SV saphenous vein; sarcoma virus; satellite virus; selective vagotomy; semilunar valve; seminal vesicle...
KMLE ÀÚµ¿ÃßÃâ ÀÇÇоà¾î »çÀü À¯»ç °Ë»ö °á°ú : 1 ÆäÀÌÁö: 1
DV Ductus venosus
°æºÏ´ë Ä¡°ú´ëÇÐ ±¸°­³»°ú ±³½Ç »çÀü À¯»ç °Ë»ö °á°ú : 7 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
    ¼³¸í
  • circulus
    À±, ȯ, ¿ø, °í¸®, ȯ»ó ¹èÄ¡
    º¸Åë µ¿¸Æ ¶Ç´Â Á¤¸ÆÀÇ È¯»ó ¹èÄ¡¸¦ °¡¸®Å°´Â °ÍÀ¸·Î ÇØºÎÇÐ ¸í¸í¹ý¿¡ ¾²ÀδÙ.
  • circulus arteriosus cerebri
    ´ë³ú µ¿¸Æ °í¸®
    ³»°æ µ¿¸Æ, Àü ¹× ÈÄ´ë³ú µ¿¸Æ, Àü ¹× ÈÄ ±³Åë µ¿¸Æ¿¡ ÀÇÇØ¼­ Çü¼ºµÇ´Â Áß¿äÇÑ ´Ùº¯Çü ¹®ÇÕ.
  • arcus venosus palmaris profundus
    ±íÀº ¼Õ¹Ù´Ú Á¤¸Æ±Ã, ½ÉÀå Á¤¸Æ±Ã, ±íÀº ¼Õ¹Ù´Ú Á¤¸ÆÈ°
    µ¿ÀǾî=dee
  • arcus venosus palmaris superficialis
    ¾èÀº ¼Õ¹Ù´Ú Á¤¸Æ±Ã, õÀå Á¤¸Æ±Ã, ¾èÀº ¼Õ¹Ù´Ú Á¤¸ÆÈ°
    µ¿ÀǾî=dee
  • plexus venosus prostaticus
    °í¸³»ù Á¤¸Æ ¾ó±â
  • sinus venosus
    Á¤¸Æµ¿, Á¤¸Æ µ¿±¼
    NA ¹èÀÚ ½ÉÀåÀÇ Áß°£¿¡¼­ Á¤¸ÆÇ÷À» ¹Þ´Â ºÎºÐ. ¿ø½Ã ½É¹æÀÇ Èĺ®¿¡ ºÎÂøÇϸç, Á¦´ë Á¤¸Æ, ³­È² Á¤¸Æ ¹× ÃѵΠÁ¤¸ÆÀ» ¹Þ´Â´Ù.
  • valve of sinus venosus
    Á¤¸Æµ¿±¼ ÆÇ¸·
CancerWEB ¿µ¿µ ÀÇÇлçÀü ¸ÂÃã °Ë»ö °á°ú : 1 ÆäÀÌÁö: 1
circulus venosus ridleyi Dural venous formation which surrounds the hypophysis, composed of right and left cavernous sinuses and the intercavernous sinuses.
Synonym: circulus venosus ridleyi, Ridley's circle.
A venous sinus at the periphery of the placenta.
Synonym: sinus venosus sclerae.
(05 Mar 2000)
CancerWEB ¿µ¿µ ÀÇÇлçÀü À¯»ç °Ë»ö °á°ú : 15 ÆäÀÌÁö: 1
circulus venosus halleri areolar venous plexus
circulus 1. Any ringlike structure.
2. A circle formed by connecting arteries, veins, or nerves.
Origin: L. Dim. Of circus, circle
(05 Mar 2000)
circulus arteriosus cerebri An anastomotic "circle" of arteries (roughly pentagonal in outline) at the base of the brain, formed, sequentially and in anterior to posterior direction, by the anterior communicating artery, the two anterior cerebral, the two internal carotid, the two posterior communicating, and the two posterior cerebral arteries.
Synonym: circulus arteriosus cerebri, circle of Willis.
(05 Mar 2000)
circulus arteriosus halleri <anatomy, nerve> A network of branches of the short ciliary arteries on the sclera around the point of entrance of the optic nerve.
Synonym: circulus vasculosus nervi optici, circulus arteriosus halleri, circulus zinnii, Haller's circle, Zinn's corona, Zinn's vascular circle.
(05 Mar 2000)
circulus arteriosus iridis major An arterial circle at the ciliary border of the iris.
Synonym: circulus arteriosus iridis major.
(05 Mar 2000)
circulus arteriosus iridis minor An arterial circle near the pupillary margin of the iris.
Synonym: circulus arteriosus iridis minor.
(05 Mar 2000)
circulus articularis vasculosus articular vascular circle, articular vascular network
circulus vasculosus nervi optici <anatomy, nerve> A network of branches of the short ciliary arteries on the sclera around the point of entrance of the optic nerve.
Synonym: circulus vasculosus nervi optici, circulus arteriosus halleri, circulus zinnii, Haller's circle, Zinn's corona, Zinn's vascular circle.
(05 Mar 2000)
circulus zinnii <anatomy, nerve> A network of branches of the short ciliary arteries on the sclera around the point of entrance of the optic nerve.
Synonym: circulus vasculosus nervi optici, circulus arteriosus halleri, circulus zinnii, Haller's circle, Zinn's corona, Zinn's vascular circle.
(05 Mar 2000)
arcus venosus dorsalis pedis The arch in the subcutaneous tissue of the dorsum of the foot formed by the dorsal and digital veins; it unites medially with the dorsal vein of the great toe to form the great saphenous vein, and laterally with the dorsal vein of the little toe to form the small saphenous.
Synonym: arcus venosus dorsalis pedis.
(05 Mar 2000)
arcus venosus juguli A connecting vein between the two anterior jugular veins in the suprasternal space.
Synonym: arcus venosus juguli.
(05 Mar 2000)
arcus venosus palmaris profundus The venous arch that accompanies the deep palmar arterial arch it usually consists of paired venae comitantes.
Synonym: arcus venosus palmaris profundus.
(05 Mar 2000)
arcus venosus palmaris superficialis The venous arch accompanying the superficial palmar arterial arch it consists usually of paired venae comitantes and is drained by the superficial ulnar and radial veins.
Synonym: arcus venosus palmaris superficialis.
(05 Mar 2000)
arcus venosus plantaris The arch formed by the plantar digital veins from the toes which accompanies the plantar arterial arch.
Synonym: arcus venosus plantaris.
(05 Mar 2000)
circellus venosus hypoglossi A small venous network around the hypoglossal nerve, connecting with the occipital sinus, inferior petrosal sinus, and internal jugular vein.
Synonym: plexus venosus canalis hypoglossi, circellus venosus hypoglossi, rete canalis hypoglossi.
(05 Mar 2000)
ÇÑ¿µ/¿µÇÑ »çÀü À¯»ç °Ë»ö °á°ú : 1 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
  • circulus
    ¹°°í±â ºñ´ÃÀÇ ³ªÀÌÅ×
ÀÌ ¾Æ·¡ ºÎÅÍ´Â °á°ú°¡ ¾ø½À´Ï´Ù.
KMLE ¾àǰ/ÀǾàǰ ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • Á¦Ç°¸í
    ¼ººÐ/ÇÔ·®
    ±¸ºÐ/º¸Çè±Þ¿©
KMLE ¾àǰ/ÀǾàǰ À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • Á¦Ç°¸í
    ¼ººÐ/ÇÔ·®
    ±¸ºÐ/º¸Çè±Þ¿©
¾Ë±â½¬¿î ÀÇÇпë¾îÇ®ÀÌÁý, ¼­¿ïÀÇ´ë ±³¼ö ÁöÁ¦±Ù, °í·ÁÀÇÇÐ ÃâÆÇ ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
¾Ë±â½¬¿î ÀÇÇпë¾îÇ®ÀÌÁý, ¼­¿ïÀÇ´ë ±³¼ö ÁöÁ¦±Ù, °í·ÁÀÇÇÐ ÃâÆÇ À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
´ëÇÑÀÇÇù ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
´ëÇÑÀÇÇù Çʼö ÀÇÇпë¾îÁý »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
¿¾ ´ëÇÑÀÇÇù ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
¿¾ ´ëÇÑÀÇÇù 2 ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
¿¾ ´ëÇÑÀÇÇù 3 ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
´ëÇÑÇØºÎÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
´ëÇѽŰæ¿Ü°úÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
    ÇÑÀÚ
´ëÇѽŰæ¿Ü°úÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
    ÇÑÀÚ
´ëÇѱâ»ýÃæÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
´ëÇѱâ»ýÃæÇÐȸ ÀÇÇпë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
´ëÇÑ»ýÈ­ÇкÐÀÚ»ý¹°ÇÐȸ ¿ë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
´ëÇÑ»ýÈ­ÇкÐÀÚ»ý¹°ÇÐȸ ¿ë¾î »çÀü °Ë»ö À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
KI ÀÇÇпë¾î »çÀü °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
KMLE ÀÇÇоà¾î »çÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
KMLE ÀÚµ¿ÃßÃâ ÀÇÇоà¾î »çÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
ÀÇÇÐ³í¹® ¾àÀÚ(Pubmed/Entrez) °Ë»ö ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
Çѱ¹Ç¥ÁØÁúº´»çÀκзù ¾àÀÚ ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ÄÚµå
    ¿µ¹®
    ÇѱÛ
Çѱ¹Ç¥ÁØÁúº´»çÀκзù ¾àÀÚ À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ÄÚµå
    ¿µ¹®
    ÇѱÛ
°æºÏ´ë Ä¡°ú´ëÇÐ ±¸°­³»°ú ±³½Ç »çÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
    ¼³¸í
MeSH(Medical Subject Headings) ¸ÂÃã °Ë»ö (http://www.nlm.nih.gov) °á°ú : 0 ÆäÀÌÁö: 1
MeSH(Medical Subject Headings) À¯»ç °Ë»ö (http://www.nlm.nih.gov) °á°ú : 0 ÆäÀÌÁö: 1
¿ÜºÎ ¸µÅ© - Merriam-Webster's ÀÇÇлçÀü ¸ÂÃã °Ë»ö (https://www.merriam-webster.com) °á°ú: 0 ÆäÀÌÁö: 1
¿ÜºÎ ¸µÅ© - Merriam-Webster's ÀÇÇлçÀü À¯»ç °Ë»ö (https://www.merriam-webster.com) °á°ú: 0 ÆäÀÌÁö: 1
¿ÜºÎ ¸µÅ© - A.D.A.M. Medical Encyclopedia ¸ÂÃã °Ë»ö (http://www.nlm.nih.gov) °á°ú: 0 ÆäÀÌÁö: 1
¿ÜºÎ ¸µÅ© - A.D.A.M. Medical Encyclopedia À¯»ç °Ë»ö (http://www.nlm.nih.gov) °á°ú: 0 ÆäÀÌÁö: 1
¿ÜºÎ ¸µÅ© - MedlinePlus Health Topics ¸ÂÃã °Ë»ö (http://www.nlm.nih.gov) °á°ú: 0 ÆäÀÌÁö: 1
¿ÜºÎ ¸µÅ© - MedlinePlus Health Topics À¯»ç °Ë»ö (http://www.nlm.nih.gov) °á°ú: 0 ÆäÀÌÁö: 1
¿ÜºÎ ¸µÅ© - µå·¯±×ÀÎÆ÷ ¾àÇÐ Á¤º¸ ¸ÂÃã °Ë»ö (http://www.druginfo.co.kr) °á°ú: 0 ÆäÀÌÁö: 1
Á¦Ç°¸í
ÆÇ¸Å»ç
º¸ÇèÄÚµå ¼ººÐ/ÇÔ·®
±¸ºÐ/º¸Çè±Þ¿©
¿ÜºÎ ¸µÅ© - µå·¯±×ÀÎÆ÷ ¾àÇÐ Á¤º¸ À¯»ç °Ë»ö (http://www.druginfo.co.kr) °á°ú: 0 ÆäÀÌÁö: 1
Á¦Ç°¸í
ÆÇ¸Å»ç
º¸ÇèÄÚµå ¼ººÐ/ÇÔ·®
±¸ºÐ/º¸Çè±Þ¿©
¿ÜºÎ ¸µÅ© - WebMD.com Drug Reference ¸ÂÃã °Ë»ö (http://www.webmd.com) °á°ú: 0 ÆäÀÌÁö: 1
¿ÜºÎ ¸µÅ© - WebMD.com Drug Reference À¯»ç °Ë»ö (http://www.webmd.com) °á°ú: 0 ÆäÀÌÁö: 1
¿ÜºÎ ¸µÅ© - Drug.com Drugs by Medical Condition ¸ÂÃã °Ë»ö (http://www.drugs.com) °á°ú: 0 ÆäÀÌÁö: 1
¿ÜºÎ ¸µÅ© - Drug.com Drugs by Medical Condition À¯»ç °Ë»ö (http://www.drugs.com) °á°ú: 0 ÆäÀÌÁö: 1
KMLE À¥ ¿ë¾î ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
KMLE À¥ ¿ë¾î À¯»ç °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
ÇÑ¿µ/¿µÇÑ »çÀü ¸ÂÃã °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
  • ¿µ¹®
    ÇѱÛ
WordNet ÀÏ¹Ý ¿µ¿µ »çÀü °Ë»ö °á°ú : 0 ÆäÀÌÁö: 1
¿ÜºÎ ¸µÅ© - American Heritage Dictionary ¿µ¿µ»çÀü ¸ÂÃã °Ë»ö (https://www.ahdictionary.com) °á°ú: 0 ÆäÀÌÁö: 1
¿ÜºÎ ¸µÅ© - American Heritage Dictionary ¿µ¿µ»çÀü À¯»ç °Ë»ö (https://www.ahdictionary.com) °á°ú: 0 ÆäÀÌÁö: 1
ÅëÇÕ°Ë»ö ¿Ï·á