{"id":39789,"date":"2024-10-27T22:03:54","date_gmt":"2024-10-28T02:03:54","guid":{"rendered":"https:\/\/brain-trainer.com\/?post_type=answer&#038;p=39789"},"modified":"2024-10-28T13:02:19","modified_gmt":"2024-10-28T17:02:19","slug":"mastoid-crease","status":"publish","type":"answer","link":"https:\/\/brain-trainer.com\/es\/answer\/mastoid-crease\/","title":{"rendered":"Mastoid Crease"},"content":{"rendered":"<div class=\"btmg-teaser btmg-teaser-fade\"><div class=\"btmg-prose\"><p>Mastoid Crease Behind the ear, near where the ear attaches to the scalp at the top, there is a valley in the heavy bone there, running usually from the ear toward the back of the head. It is called the mastoid crease. It can also be found just below the level of T4 and T6, partway between them. On the left, the site is referred to as MC1, and on the right, MC2. Although A1 and A2 technically refer to [&hellip;]<\/p><\/div><\/div>  <div class=\"btmg-gateB\">\n    <div class=\"btmg-left\">\n      <span class=\"btmg-lockbadge\">\n        <svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><rect x=\"4\" y=\"11\" width=\"16\" height=\"9\" rx=\"2\"\/><path d=\"M8 11V8a4 4 0 0 1 8 0v3\"\/><\/svg>\n      <\/span>\n      <h3 class=\"btmg-head\">Unlock the full Answers Library<\/h3>\n      <p class=\"btmg-sub\">La biblioteca es una enciclopedia pr\u00e1ctica, organizada y con capacidad de b\u00fasqueda sobre qu\u00e9 es el entrenamiento cerebral y c\u00f3mo cambia vidas en el mundo real, escrita a lo largo de veinticinco a\u00f1os por Peter Van Deusen, fundador del sistema de entrenamiento Whole-Brain.<\/p>\n              <button type=\"button\" class=\"btmg-video-thumb\" data-vimeo-id=\"1213287093\" aria-label=\"Play video\">\n                      <img width=\"752\" height=\"423\" src=\"https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-752x423.png\" class=\"attachment-btmg-video-thumb size-btmg-video-thumb\" alt=\"\" loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-752x423.png 752w, https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-200x113.png 200w, https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-1024x576.png 1024w, https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-768x432.png 768w, https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-1536x865.png 1536w, https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-300x169.png 300w, https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail.png 1727w\" sizes=\"auto, (max-width: 752px) 100vw, 752px\" \/>                    <span class=\"btmg-video-play\" aria-hidden=\"true\">\n            <svg viewBox=\"0 0 24 24\" fill=\"currentColor\"><path d=\"M8 5v14l11-7z\"\/><\/svg>\n          <\/span>\n        <\/button>\n            <div class=\"btmg-memberbox btmg-memberline\">\n        \u00bfYa eres miembro?        <a href=\"https:\/\/brain-trainer.com\/wp-login.php?redirect_to=https%3A%2F%2Fbrain-trainer.com%2Fes%2Fanswer%2Fmastoid-crease%2F\">Iniciar sesi\u00f3n<\/a>\n      <\/div>\n    <\/div>\n    <div class=\"btmg-right\">\n              <div class=\"btmg-pcard\">\n          <div class=\"btmg-r1\">\n            <span class=\"btmg-nm\">Membres\u00eda de Respuestas de 4 meses<\/span>\n          <\/div>\n          <div class=\"btmg-pr\">\n            <span class=\"btmg-amt\">$50<\/span>\n            <span class=\"btmg-per\">\/ 4 meses<\/span>\n          <\/div>\n          <div><a href=\"https:\/\/brain-trainer.com\/es\/?add-to-cart=18397&#038;checkout=1&#038;clear_cart=1\" class=\"btmg-btn btmg-btn-primary btmg-btn-block btmg-btn-sm\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"9\" cy=\"20\" r=\"1.5\"\/><circle cx=\"18\" cy=\"20\" r=\"1.5\"\/><path d=\"M2 3h3l2.4 12.3a1.5 1.5 0 0 0 1.5 1.2h8.2a1.5 1.5 0 0 0 1.5-1.2L21.5 7H6\"\/><\/svg><span>Comprar ahora<\/span><\/a><\/div>\n        <\/div>\n                    <div class=\"btmg-pcard btmg-pcard-pop\">\n          <div class=\"btmg-r1\">\n            <span class=\"btmg-nm\">Plan de Respuestas ilimitado<\/span>\n            <span class=\"btmg-poptag\">Best value<\/span>\n          <\/div>\n          <div class=\"btmg-pr\">\n            <span class=\"btmg-amt\">$99<\/span>\n            <span class=\"btmg-per\">one time<\/span>\n          <\/div>\n          <div><a href=\"https:\/\/brain-trainer.com\/es\/?add-to-cart=45724&#038;checkout=1&#038;clear_cart=1\" class=\"btmg-btn btmg-btn-gold btmg-btn-block btmg-btn-sm\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"9\" cy=\"20\" r=\"1.5\"\/><circle cx=\"18\" cy=\"20\" r=\"1.5\"\/><path d=\"M2 3h3l2.4 12.3a1.5 1.5 0 0 0 1.5 1.2h8.2a1.5 1.5 0 0 0 1.5-1.2L21.5 7H6\"\/><\/svg><span>Comprar ahora<\/span><\/a><\/div>\n        <\/div>\n                  <div class=\"btmg-trial-divider\"><span>o pru\u00e9balo primero<\/span><\/div>\n      <div class=\"btmg-trial-slot\">\n        <button type=\"button\" class=\"btmg-btn btmg-btn-trial btmg-btn-block btmg-trial-open\">\n          <span>Iniciar prueba gratuita de 10 minuto<\/span>\n        <\/button>\n        <form class=\"btmg-trial-form\" novalidate hidden>\n          <label class=\"btmg-trial-label\" for=\"btmg-trial-email-39789\">Ingresa tu correo electr\u00f3nico para iniciar tu prueba gratuita<\/label>\n          <div class=\"btmg-trial-row\">\n            <input type=\"email\" inputmode=\"email\" autocomplete=\"email\" required class=\"btmg-trial-email\" id=\"btmg-trial-email-39789\" placeholder=\"tu@ejemplo.com\">\n            <button type=\"submit\" class=\"btmg-btn btmg-btn-primary btmg-btn-sm btmg-trial-submit\"><span>Empezar<\/span><\/button>\n          <\/div>\n          <p class=\"btmg-trial-msg\" role=\"status\" aria-live=\"polite\"><\/p>\n        <\/form>\n      <\/div>\n          <\/div>\n  <\/div>\n      <div class=\"btmg-video-modal\" hidden>\n      <div class=\"btmg-video-modal-backdrop\"><\/div>\n      <div class=\"btmg-video-modal-box\">\n        <button type=\"button\" class=\"btmg-video-modal-close\" aria-label=\"Close video\">&times;<\/button>\n        <div class=\"btmg-video-modal-frame\"><\/div>\n      <\/div>\n    <\/div>\n      <div class=\"btmg-trial-login-modal\" hidden>\n    <div class=\"btmg-trial-login-backdrop\"><\/div>\n    <div class=\"btmg-trial-login-box\">\n      <button type=\"button\" class=\"btmg-trial-login-close\" aria-label=\"Cerrar\">&times;<\/button>\n      <h3>Inicia sesi\u00f3n para activar tu prueba<\/h3>\n      <p>Ya tienes una cuenta con este correo electr\u00f3nico. Inicia sesi\u00f3n y tu prueba gratuita comenzar\u00e1 de inmediato.<\/p>\n      <form class=\"btmg-trial-login-form\" novalidate>\n        <label class=\"btmg-trial-label\" for=\"btmg-trial-login-email\">Correo electr\u00f3nico<\/label>\n        <input type=\"email\" inputmode=\"email\" autocomplete=\"email\" required readonly class=\"btmg-trial-login-email\" id=\"btmg-trial-login-email\">\n        <label class=\"btmg-trial-label\" for=\"btmg-trial-login-password\">Contrase\u00f1a<\/label>\n        <input type=\"password\" autocomplete=\"current-password\" required class=\"btmg-trial-login-password\" id=\"btmg-trial-login-password\">\n                  <div class=\"btmg-trial-login-turnstile\">\n            \t\t<div id=\"cf-turnstile-trial-login\"\r\n\t\tclass=\"cf-turnstile\" data-callback=\"\"\t\tdata-sitekey=\"0x4AAAAAAB4vGwYb0JDIz6Yz\"\r\n\t\tdata-theme=\"light\"\r\n\t\tdata-language=\"auto\"\r\n\t\tdata-size=\"normal\"\r\n\t\tdata-retry=\"auto\" data-retry-interval=\"1000\"\r\n\t\tdata-refresh-expired=\"auto\"\r\n\t\tdata-refresh-timeout=\"auto\"\r\n\t\tdata-action=\"bt-trial-login\"\r\n\t\tdata-callback=\"\"\r\n\t\t\t\tdata-appearance=\"always\"><\/div>\r\n\t\t\t\t<style>.btmg-trial-login-submit { pointer-events: none; opacity: 0.5; }<\/style>\r\n\t\t\t\t<br class=\"cf-turnstile-br cf-turnstile-br-trial-login\">\r\n\t\t\t\t<style>#cf-turnstile-trial-login { margin-left: -15px; }<\/style>\r\n\t\t          <\/div>\n                <button type=\"submit\" class=\"btmg-btn btmg-btn-primary btmg-btn-block btmg-trial-login-submit\"><span>Iniciar sesi\u00f3n<\/span><\/button>\n        <p class=\"btmg-trial-msg btmg-trial-login-msg\" role=\"status\" aria-live=\"polite\"><\/p>\n        <p class=\"btmg-trial-login-forgot\"><a href=\"https:\/\/brain-trainer.com\/es\/mi-cuenta\/lost-password\/\" target=\"_blank\" rel=\"noopener\">\u00bfOlvidaste tu contrase\u00f1a?<\/a><\/p>\n      <\/form>\n    <\/div>\n  <\/div>\n  ","protected":false},"excerpt":{"rendered":"<div class=\"btmg-teaser btmg-teaser-fade\">\n<div class=\"btmg-prose\">\n<p>Mastoid Crease Behind the ear, near where the ear attaches to the scalp at the top, there is a valley in the heavy bone there, running usually from the ear toward the back of the head. It is called the mastoid crease. It can also be found just below the level of T4 and T6, partway between them. On the left, the site is referred to as MC1, and on the right, MC2. Although A1 and A2 technically refer to [&hellip;]<\/p>\n<\/div>\n<\/div>\n<div class=\"btmg-gateB\">\n<div class=\"btmg-left\">\n      <span class=\"btmg-lockbadge\"><br \/>\n        <svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><rect x=\"4\" y=\"11\" width=\"16\" height=\"9\" rx=\"2\"\/><path d=\"M8 11V8a4 4 0 0 1 8 0v3\"\/><\/svg><br \/>\n      <\/span><\/p>\n<h3 class=\"btmg-head\">Unlock the full Answers Library<\/h3>\n<p class=\"btmg-sub\">La biblioteca es una enciclopedia pr\u00e1ctica, organizada y con capacidad de b\u00fasqueda sobre qu\u00e9 es el entrenamiento cerebral y c\u00f3mo cambia vidas en el mundo real, escrita a lo largo de veinticinco a\u00f1os por Peter Van Deusen, fundador del sistema de entrenamiento Whole-Brain.<\/p>\n<p>              <button type=\"button\" class=\"btmg-video-thumb\" data-vimeo-id=\"1213287093\" aria-label=\"Play video\"><br \/>\n                      <img width=\"752\" height=\"423\" src=\"https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-752x423.png\" class=\"attachment-btmg-video-thumb size-btmg-video-thumb\" alt=\"\" loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-752x423.png 752w, https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-200x113.png 200w, https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-1024x576.png 1024w, https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-768x432.png 768w, https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-1536x865.png 1536w, https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail-300x169.png 300w, https:\/\/brain-trainer.com\/wp-content\/uploads\/2026\/08\/membership-video-thumbnail.png 1727w\" sizes=\"auto, (max-width: 752px) 100vw, 752px\" \/>                    <span class=\"btmg-video-play\" aria-hidden=\"true\"><br \/>\n            <svg viewBox=\"0 0 24 24\" fill=\"currentColor\"><path d=\"M8 5v14l11-7z\"\/><\/svg><br \/>\n          <\/span><br \/>\n        <\/button><\/p>\n<div class=\"btmg-memberbox btmg-memberline\">\n        \u00bfYa eres miembro?        <a href=\"https:\/\/brain-trainer.com\/wp-login.php?redirect_to=https%3A%2F%2Fbrain-trainer.com%2Fes%2Fanswer%2Fmastoid-crease%2F\">Iniciar sesi\u00f3n<\/a>\n      <\/div>\n<\/p><\/div>\n<div class=\"btmg-right\">\n<div class=\"btmg-pcard\">\n<div class=\"btmg-r1\">\n            <span class=\"btmg-nm\">Membres\u00eda de Respuestas de 4 meses<\/span>\n          <\/div>\n<div class=\"btmg-pr\">\n            <span class=\"btmg-amt\">$50<\/span><br \/>\n            <span class=\"btmg-per\">\/ 4 meses<\/span>\n          <\/div>\n<div><a href=\"https:\/\/brain-trainer.com\/es\/?add-to-cart=18397&#038;checkout=1&#038;clear_cart=1\" class=\"btmg-btn btmg-btn-primary btmg-btn-block btmg-btn-sm\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"9\" cy=\"20\" r=\"1.5\"\/><circle cx=\"18\" cy=\"20\" r=\"1.5\"\/><path d=\"M2 3h3l2.4 12.3a1.5 1.5 0 0 0 1.5 1.2h8.2a1.5 1.5 0 0 0 1.5-1.2L21.5 7H6\"\/><\/svg><span>Comprar ahora<\/span><\/a><\/div>\n<\/p><\/div>\n<div class=\"btmg-pcard btmg-pcard-pop\">\n<div class=\"btmg-r1\">\n            <span class=\"btmg-nm\">Plan de Respuestas ilimitado<\/span><br \/>\n            <span class=\"btmg-poptag\">Best value<\/span>\n          <\/div>\n<div class=\"btmg-pr\">\n            <span class=\"btmg-amt\">$99<\/span><br \/>\n            <span class=\"btmg-per\">one time<\/span>\n          <\/div>\n<div><a href=\"https:\/\/brain-trainer.com\/es\/?add-to-cart=45724&#038;checkout=1&#038;clear_cart=1\" class=\"btmg-btn btmg-btn-gold btmg-btn-block btmg-btn-sm\"><svg viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><circle cx=\"9\" cy=\"20\" r=\"1.5\"\/><circle cx=\"18\" cy=\"20\" r=\"1.5\"\/><path d=\"M2 3h3l2.4 12.3a1.5 1.5 0 0 0 1.5 1.2h8.2a1.5 1.5 0 0 0 1.5-1.2L21.5 7H6\"\/><\/svg><span>Comprar ahora<\/span><\/a><\/div>\n<\/p><\/div>\n<div class=\"btmg-trial-divider\"><span>o pru\u00e9balo primero<\/span><\/div>\n<div class=\"btmg-trial-slot\">\n        <button type=\"button\" class=\"btmg-btn btmg-btn-trial btmg-btn-block btmg-trial-open\"><br \/>\n          <span>Iniciar prueba gratuita de 10 minuto<\/span><br \/>\n        <\/button><\/p>\n<form class=\"btmg-trial-form\" novalidate hidden>\n          <label class=\"btmg-trial-label\" for=\"btmg-trial-email-39789\">Ingresa tu correo electr\u00f3nico para iniciar tu prueba gratuita<\/label><\/p>\n<div class=\"btmg-trial-row\">\n            <input type=\"email\" inputmode=\"email\" autocomplete=\"email\" required class=\"btmg-trial-email\" id=\"btmg-trial-email-39789\" placeholder=\"tu@ejemplo.com\"><br \/>\n            <button type=\"submit\" class=\"btmg-btn btmg-btn-primary btmg-btn-sm btmg-trial-submit\"><span>Empezar<\/span><\/button>\n          <\/div>\n<p class=\"btmg-trial-msg\" role=\"status\" aria-live=\"polite\">\n<\/p><\/form>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"btmg-video-modal\" hidden>\n<div class=\"btmg-video-modal-backdrop\"><\/div>\n<div class=\"btmg-video-modal-box\">\n        <button type=\"button\" class=\"btmg-video-modal-close\" aria-label=\"Close video\">&times;<\/button><\/p>\n<div class=\"btmg-video-modal-frame\"><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"btmg-trial-login-modal\" hidden>\n<div class=\"btmg-trial-login-backdrop\"><\/div>\n<div class=\"btmg-trial-login-box\">\n      <button type=\"button\" class=\"btmg-trial-login-close\" aria-label=\"Cerrar\">&times;<\/button><\/p>\n<h3>Inicia sesi\u00f3n para activar tu prueba<\/h3>\n<p>Ya tienes una cuenta con este correo electr\u00f3nico. 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It is called the mastoid crease. It can also be found just below the level of T4 and T6, partway between them. On the left, the site is referred to as MC1, and on the right, MC2. 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