First, I am open to correction. I usually focus on human anatomy, but have a special place in my heart for histology. This image is a histological slide, (a picture of stained cells) and rather low resolution, so specific cell structures are difficult to determine.  Based on my education, experience, and links below, I believe the following to be the labeled anatomy.<p><a href="http:&#x2F;&#x2F;bioscicreative.com&#x2F;portfolio-item&#x2F;octopus-histological-enhancement&#x2F;" rel="nofollow">http:&#x2F;&#x2F;bioscicreative.com&#x2F;portfolio-item&#x2F;octopus-histologica...</a><p>Sources: 
<a href="http:&#x2F;&#x2F;springerplus.springeropen.com&#x2F;articles&#x2F;10.1186&#x2F;2193-1801-3-22" rel="nofollow">http:&#x2F;&#x2F;springerplus.springeropen.com&#x2F;articles&#x2F;10.1186&#x2F;2193-1...</a>
<a href="http:&#x2F;&#x2F;tolweb.org&#x2F;accessory&#x2F;Cephalopod_Digestive_System_Comparisons?acc_id=2152" rel="nofollow">http:&#x2F;&#x2F;tolweb.org&#x2F;accessory&#x2F;Cephalopod_Digestive_System_Comp...</a>
<a href="http:&#x2F;&#x2F;chestofbooks.com&#x2F;animals&#x2F;zoology&#x2F;Anatomy&#x2F;Cephalopoda-Cuvier-Part-6.html" rel="nofollow">http:&#x2F;&#x2F;chestofbooks.com&#x2F;animals&#x2F;zoology&#x2F;Anatomy&#x2F;Cephalopoda-...</a>
<a href="http:&#x2F;&#x2F;tolweb.org&#x2F;notes&#x2F;?note_id=4541" rel="nofollow">http:&#x2F;&#x2F;tolweb.org&#x2F;notes&#x2F;?note_id=4541</a>
<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Digestive_system_of_gastropods" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Digestive_system_of_gastropods</a>