21. When expanded, at most 40 tentacles can be observed on the inside surface of the branchial wall. 22. It has a pale red or transparent colour, with red branchial structures on its dorsal and ventral sides. 23. The efferent signal to the musculature of the pharynx is carried by the branchial motor fibers of the vagus nerve. 24. The system is built around an appendage of each branchial heart, which is essentially an extension of its pericardium. 25. By day 10.5, the branchial arch and limbs also begin to express " Osr1 ". 26. The action of the branchial hearts is necessary for the production of primary urine in these appendages via pressure filtration. 27. Branchial hearts may have evolved from the pericardial glands of nautiloids, such as those still found in modern nautiluses.28. Alt = Diagram labeling siphon, intestine, nidamental gland, accessory nidamental gland, renal pore, and branchial heart. 29. Persons with BOR syndrome also present with hearing loss, branchial fistulas or cysts, malformed ears, and lacrimal stenosis. 30. Each of these bundles consists of a single row of radioles attached to a branchial stalk and curved into a semicircle.
