Items tagged “diagram”

9 results found
Article

Couinaud classification of hepatic segments

The Couinaud classification (French eponym: pronounced kwee-NO) is currently the most widely used system to describe functional liver anatomy. It is the preferred anatomy classification system as it divides the liver into eight independent functional units (termed segments) rather than relying o...
Article

Medical illustrations and diagrams

High-quality medical illustrations and diagrams form an important part of Radiopaedia.org.  Attribution All illustrations should have appropriate attribution in the case findings and only be uploaded to Radiopaedia under the following circumstances:  original illustrations created by you (you...
Article

Torus tubarius

Torus tubarius (plural: tori tubarii) or cushion of the auditory canal is a mucosal elevation in the lateral aspect of the nasopharynx, formed by the underlying pharyngeal end of the cartilaginous portion of the Eustachian tube. The opening of the Eustachian tube is anterior to the torus tobariu...
Article

Ishikawa classification of venous involvement by pancreatic ductal adenocarcinoma

Ishikawa classification system describes the degree of involvement of adjacent portal vein and superior mesenteric vein by pancreatic ductal adenocarcinoma based on the caliber of the vein: type I: normal  type II: smooth shift/displacement with normal caliber   type III: unilateral narrowing...
Article

Transition zone (nerve)

The transition zone of a nerve, also known as the Obersteiner-Redlich zone, describes a region of a few millimeters where the myelin sheath changes from a central to peripheral type as enveloping glial cells are replaced by Schwann cells. Gross anatomy Transition zone locations 1: CN V: 4 mm ...
Article

Bunny waveform sign

Bunny waveform sign refers to the biphasic morphology of the pulsed wave Doppler spectral waveform in the vertebral artery in early (occult/latent or partial) subclavian steal phenomenon (sometimes called a "presteal" state, before it progresses to frank flow reversal). There is a sharp decelera...
Article

Lymph nodes

The lymph nodes (commonly shortened to nodes, and known as nodus lymphoideus in TA 4) collectively form one of the secondary lymphoid organs. Gross anatomy Macroscopically, a normal lymph node is a small ellipsoid structure, approximately 0.1 to 2.5 cm in maximal length 2,3. Nodes often posses...
Article

Deep posterior tibiotalar ligament

The deep posterior tibiotalar ligament (DPTTL) is one of the two deep components and the strongest part of the deltoid ligament 1,2. Gross anatomy The deep posterior tibiotalar ligament is covered by the superficial posterior tibiotalar and tibiocalcaneal ligaments. It is a broad and thick lig...
Article

Cystic vein

The cystic veins (TA: venae cysticae) are one of two venous drainage pathways of the gallbladder. They subsequently drain into the portal vein. Gross anatomy The cystic veins begin as venules running over the surface of the fundus and body of the gallbladder merging proximate to the neck of th...