The Circulatory System in the Lower Jaw of the Skipjack Tuna (Katsuwonus Pelamis) with Special Reference to the Thyroid Gland
Basic anatomical information is presented on the location of the thyroid gland and the circulatory system in the lower jaw of the skipjack tuna (Katsuwonus pelamis), previous treatises on scombrid anatomy and morphology having neglected this complex region. The thyroid gland consists of two compact lobes; the anterior lobe is located immediately in front of the roots of the first afferent branchial arteries (Y-fork of the ventral aorta), and the posterior lobe dorsally and laterally between the roots of the first and second afferent branchial arteries. Those parts of the arterial and venous systems connecting the heart and the thyroid gland, gill arches, and other areas of the lower jaw are described. Two major sinuses, found in close relation to the inferior jugular vein, may be part of a lymphatic system.
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Document Type: Research Article
Publication date: 1976-01-01
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