{"id":1346,"date":"2026-02-02T11:00:00","date_gmt":"2026-02-02T14:00:00","guid":{"rendered":"https:\/\/www.grupomedcof.com.br\/blog\/?p=1346"},"modified":"2026-01-28T14:30:13","modified_gmt":"2026-01-28T17:30:13","slug":"glandula-adrenal","status":"publish","type":"post","link":"https:\/\/www.grupomedcof.com.br\/blog\/glandula-adrenal\/","title":{"rendered":"Gl\u00e2ndula Adrenal: entenda sobre a fisiologia e anatomia!"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Sum\u00e1rio<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar tabela de conte\u00fado\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/glandula-adrenal\/#Microanatomia_do_Cortex\" >Microanatomia do C\u00f3rtex<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/glandula-adrenal\/#Zona_Glomerulosa_Camada_Externa\" >Zona Glomerulosa (Camada Externa)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/glandula-adrenal\/#Zona_Fasciculada_Camada_Medial\" >Zona Fasciculada (Camada Medial)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/glandula-adrenal\/#Zona_Reticular_Camada_Interna\" >Zona Reticular (Camada Interna)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/glandula-adrenal\/#A_Medula_Adrenal_extensao_do_Sistema_Nervoso\" >A Medula Adrenal: extens\u00e3o do Sistema Nervoso<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/glandula-adrenal\/#O_eixo_Hipotalamo-Hipofise\" >O eixo Hipot\u00e1lamo-Hip\u00f3fise<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/glandula-adrenal\/#O_%E2%80%9CCombo%E2%80%9D_da_POMC\" >O &#8220;Combo&#8221; da POMC<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/glandula-adrenal\/#Correlacao_Clinica_o_sinal_da_hiperpigmentacao\" >Correla\u00e7\u00e3o Cl\u00ednica: o sinal da hiperpigmenta\u00e7\u00e3o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.grupomedcof.com.br\/blog\/glandula-adrenal\/#Conquiste_a_aprovacao_e_acompanhe_mais_noticias\" >Conquiste a aprova\u00e7\u00e3o e acompanhe mais not\u00edcias!<\/a><\/li><\/ul><\/nav><\/div>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/DIABETE-MELITUS-2-1-1-1-1024x576.png\" alt=\"insufici\u00eancia adrenal\" class=\"wp-image-1347\" srcset=\"https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/DIABETE-MELITUS-2-1-1-1-1024x576.png 1024w, https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/DIABETE-MELITUS-2-1-1-1-300x169.png 300w, https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/DIABETE-MELITUS-2-1-1-1-768x432.png 768w, https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/DIABETE-MELITUS-2-1-1-1-1536x864.png 1536w, https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/DIABETE-MELITUS-2-1-1-1-2048x1152.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>As <strong>gl\u00e2ndulas adrenais<\/strong> (ou suprarrenal) s\u00e3o\u00a0dois pequenos <strong>\u00f3rg\u00e3os localizados acima dos rins,<\/strong> essenciais para o <strong>sistema end\u00f3crino<\/strong> e \u00e9 frequentemente descrita na anatomia com uma forma curiosa que <strong>parece um &#8220;chap\u00e9u&#8221;<\/strong> posicionado sobre os polos superiores dos rins. Embora pequena, sua complexidade fisiol\u00f3gica \u00e9 imensa. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-microanatomia-do-cortex\"><span class=\"ez-toc-section\" id=\"Microanatomia_do_Cortex\"><\/span><strong>Microanatomia do C\u00f3rtex<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>O c\u00f3rtex adrenal n\u00e3o \u00e9 uma massa homog\u00eanea; ele \u00e9 estratificado em tr\u00eas zonas histol\u00f3gicas, cada uma com uma fun\u00e7\u00e3o secretora e regula\u00e7\u00e3o espec\u00edfica.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-zona-glomerulosa-camada-externa\"><span class=\"ez-toc-section\" id=\"Zona_Glomerulosa_Camada_Externa\"><\/span><strong>Zona Glomerulosa (Camada Externa)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Produto:<\/strong> Mineralocorticoides, especificamente a <strong>Aldosterona<\/strong>.<\/li>\n\n\n\n<li><strong>Regula\u00e7\u00e3o:<\/strong> Diferente do restante do c\u00f3rtex, esta zona responde primariamente ao <strong>Sistema Renina-Angiotensina-Aldosterona (SRAA)<\/strong> e aos n\u00edveis de pot\u00e1ssio s\u00e9rico.<\/li>\n\n\n\n<li><strong>Nota de Prova:<\/strong> O ACTH tem pouca influ\u00eancia aguda aqui. O gatilho para a secre\u00e7\u00e3o \u00e9 a volemia e o status eletrol\u00edtico, n\u00e3o o eixo hipofis\u00e1rio direto.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-zona-fasciculada-camada-medial\"><span class=\"ez-toc-section\" id=\"Zona_Fasciculada_Camada_Medial\"><\/span><strong>Zona Fasciculada (Camada Medial)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Produto:<\/strong> Glicocortic\u00f3ides, sendo o <strong>Cortisol<\/strong> o principal representante.<\/li>\n\n\n\n<li><strong>Regula\u00e7\u00e3o:<\/strong> Estritamente dependente do est\u00edmulo do <strong>ACTH<\/strong> hipofis\u00e1rio.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-zona-reticular-camada-interna\"><span class=\"ez-toc-section\" id=\"Zona_Reticular_Camada_Interna\"><\/span><strong>Zona Reticular (Camada Interna)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Produto:<\/strong> Andr\u00f3genos adrenais, com destaque para o <strong>Sulfato de DHEA (SDHEA)<\/strong>.<\/li>\n\n\n\n<li><strong>Regula\u00e7\u00e3o:<\/strong> Assim como a fasciculada, \u00e9 dependente do <strong>ACTH<\/strong>.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"573\" height=\"514\" src=\"https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image.png\" alt=\"\" class=\"wp-image-41134\" srcset=\"https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image.png 573w, https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image-300x269.png 300w, https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image-468x420.png 468w, https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image-150x135.png 150w\" sizes=\"auto, (max-width: 573px) 100vw, 573px\" \/><figcaption class=\"wp-element-caption\">Anatomia e Histologia da Adrenal.Fonte: : Adaptado de MOLINA, Patricia E. Fisiologia end\u00f3crina. 4. ed. Rio de Janeiro: McGraw Hill, 2014.\u00a0<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-a-medula-adrenal-extensao-do-sistema-nervoso\"><span class=\"ez-toc-section\" id=\"A_Medula_Adrenal_extensao_do_Sistema_Nervoso\"><\/span><strong>A Medula Adrenal: extens\u00e3o do Sistema Nervoso<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A por\u00e7\u00e3o central, ou medula, comporta-se funcionalmente menos como uma gl\u00e2ndula end\u00f3crina cl\u00e1ssica e mais como um g\u00e2nglio simp\u00e1tico modificado.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Produtos:<\/strong> Catecolaminas \u2014 <strong>Adrenalina (Epinefrina)<\/strong> e <strong>Noradrenalina (Norepinefrina)<\/strong>.<\/li>\n\n\n\n<li><strong>Gatilho:<\/strong> A secre\u00e7\u00e3o ocorre sob est\u00edmulo direto do <strong>Sistema Nervoso Simp\u00e1tico<\/strong> (&#8220;lutar ou fugir&#8221;).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-o-eixo-hipotalamo-hipofise\"><span class=\"ez-toc-section\" id=\"O_eixo_Hipotalamo-Hipofise\"><\/span><strong>O eixo Hipot\u00e1lamo-Hip\u00f3fise<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A regula\u00e7\u00e3o do cortisol e dos andr\u00f3genos envolve uma cascata complexa que come\u00e7a no sistema nervoso central.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Inputs Superiores:<\/strong> O hipot\u00e1lamo recebe sinais de diversas \u00e1reas, incluindo o sistema l\u00edmbico (emo\u00e7\u00f5es\/estresse), centros aut\u00f4nomos e o ritmo circadiano.<\/li>\n\n\n\n<li><strong>O Comandante (CRH):<\/strong> O hipot\u00e1lamo secreta o Horm\u00f4nio Liberador de Corticotrofina (CRH).<\/li>\n\n\n\n<li><strong>A Resposta Hipofis\u00e1ria (POMC):<\/strong> Na adenohip\u00f3fise (hip\u00f3fise anterior), o CRH estimula a clivagem de um grande precursor chamado <strong>Proopiomelanocortina (POMC)<\/strong>.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"552\" height=\"494\" src=\"https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image-1.png\" alt=\"\" class=\"wp-image-41135\" srcset=\"https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image-1.png 552w, https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image-1-300x268.png 300w, https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image-1-469x420.png 469w, https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image-1-150x134.png 150w\" sizes=\"auto, (max-width: 552px) 100vw, 552px\" \/><figcaption class=\"wp-element-caption\">Fisiologia da Adrenal. Fonte:\u00a0 Vilar, Lucio [et al]. Endocrinologia Cl\u00ednica. 7\u00aa edi\u00e7\u00e3o. Rio de Janeiro: Guanabara Koogan, 2021 (modificado).<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-o-combo-da-pomc\"><span class=\"ez-toc-section\" id=\"O_%E2%80%9CCombo%E2%80%9D_da_POMC\"><\/span><strong>O &#8220;Combo&#8221; da POMC<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Aqui reside um detalhe fisiol\u00f3gico crucial. A POMC, ao ser clivada enzimaticamente, n\u00e3o libera apenas ACTH. Ela libera simultaneamente:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ACTH:<\/strong> Que estimular\u00e1 a produ\u00e7\u00e3o de cortisol e andr\u00f3genos no c\u00f3rtex.<\/li>\n\n\n\n<li><strong>Beta-endorfina:<\/strong> Opi\u00f3ide end\u00f3geno.<\/li>\n\n\n\n<li><strong>MSH (Horm\u00f4nio Estimulador de Melan\u00f3citos):<\/strong> Respons\u00e1vel pela pigmenta\u00e7\u00e3o.<\/li>\n<\/ul>\n\n\n\n<p>O sistema opera via <strong>feedback negativo<\/strong>: n\u00edveis elevados de cortisol inibem a libera\u00e7\u00e3o de CRH e ACTH, fechando o ciclo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-correlacao-clinica-o-sinal-da-hiperpigmentacao\"><span class=\"ez-toc-section\" id=\"Correlacao_Clinica_o_sinal_da_hiperpigmentacao\"><\/span><strong>Correla\u00e7\u00e3o Cl\u00ednica: o sinal da hiperpigmenta\u00e7\u00e3o<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A compreens\u00e3o da clivagem da POMC \u00e9 a chave para o diagn\u00f3stico diferencial das insufici\u00eancias adrenais na pr\u00e1tica cl\u00ednica e nas provas.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>O Mecanismo:<\/strong> O MSH (liberado junto com o ACTH da mol\u00e9cula de POMC) atua diretamente nos melan\u00f3citos da pele, estimulando a produ\u00e7\u00e3o de melanina.<\/li>\n\n\n\n<li><strong>Insufici\u00eancia Adrenal Prim\u00e1ria (Doen\u00e7a de Addison):<\/strong> Quando a adrenal falha, o feedback negativo \u00e9 perdido. O hipot\u00e1lamo e a hip\u00f3fise tentam compensar aumentando drasticamente a produ\u00e7\u00e3o de POMC\/ACTH. Como &#8220;efeito colateral&#8221;, os n\u00edveis de MSH explodem, causando a hiperpigmenta\u00e7\u00e3o de pele e mucosas.<\/li>\n\n\n\n<li><strong>Insufici\u00eancia Adrenal Secund\u00e1ria:<\/strong> Se a falha \u00e9 na hip\u00f3fise (falta de ACTH) ou hipot\u00e1lamo, n\u00e3o h\u00e1 excesso de POMC nem de MSH. O paciente apresenta palidez ou pele normal, <strong>sem<\/strong> hiperpigmenta\u00e7\u00e3o.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"372\" height=\"336\" src=\"https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image.jpeg\" alt=\"\" class=\"wp-image-41136\" style=\"aspect-ratio:1.107147839836302;width:647px;height:auto\" srcset=\"https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image.jpeg 372w, https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image-300x271.jpeg 300w, https:\/\/www.grupomedcof.com.br\/blog\/wp-content\/uploads\/2022\/07\/image-150x135.jpeg 150w\" sizes=\"auto, (max-width: 372px) 100vw, 372px\" \/><figcaption class=\"wp-element-caption\">Fonte: <a href=\"https:\/\/doi.org\/10.1590\/S0365-05962009000600008\">https:\/\/doi.org\/10.1590\/S0365-05962009000600008<\/a>\u00a0<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conquiste-a-aprovacao-e-acompanhe-mais-noticias\"><span class=\"ez-toc-section\" id=\"Conquiste_a_aprovacao_e_acompanhe_mais_noticias\"><\/span><strong>Conquiste a aprova\u00e7\u00e3o e acompanhe mais not\u00edcias!<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Gostou do conte\u00fado? Continue acompanhando nosso blog para ficar por dentro das principais&nbsp;<strong>not\u00edcias sobre&nbsp;<a href=\"https:\/\/www.grupomedcof.com.br\/home\/\" target=\"_blank\" rel=\"noreferrer noopener\">resid\u00eancia m\u00e9dica,<\/a>&nbsp;editais e&nbsp;<a href=\"https:\/\/www.grupomedcof.com.br\/blog\/presenca-da-medcof-nas-aprovacoes-em-residencia-medica-no-brasil\/\" target=\"_blank\" rel=\"noreferrer noopener\">oportunidades que podem transformar sua carreira!<\/a><\/strong><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"youtube-embed\" data-video_id=\"0lAzIDf7df0\"><iframe loading=\"lazy\" title=\"Tudo o que voc\u00ea precisa saber sobre Insufici\u00eancia Adrenal. Com Dra. Mariana Ramos\" width=\"696\" height=\"392\" src=\"https:\/\/www.youtube.com\/embed\/0lAzIDf7df0?feature=oembed&#038;enablejsapi=1\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Conhe\u00e7a melhor a anatomia e fisiologia das gl\u00e2ndulas adrenais. 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