02.08.2020

thermoregulation in whales

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By continuing to browse this site, you agree to its use of cookies as described in our I have read and accept the Wiley Online Library Terms and Conditions of UseHandbook of marine mammals, Vol. Much credit for histological and photomicroscopic assistance is owed to Robert J. Ferrante, Director of the Experimental Neuropathology and Translational Therapeutics Laboratory, Bedford (MA) Veteran's Administration Hospital and Boston University School of Medicine. The dark arrow indicates the center line of the oral surface, at the depressed midline of the palatal organ.

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Both the anatomical position and the histological composition of this organ suggest a facultative thermoregulatory function.

Myelinated nerves of varying diameter (0.01–0.6 mm; Fig.

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Tissues were collected under Permit #519 issued to T.F. Blubber serves as an insulating layer to protect small whales from hypothermia.

An Intraoral Thermoregulatory Organ in the Bowhead Whale ( Balaena mysticetus ), the Corpus Cavernosum Maxillaris MATERIALS AND METHODS.

thermoregulation in whales In whale

It should be noted that adult whales examined for this study did not die of natural causes; it is possible that this extravascular blood results from agonal death although many whales harvested by Inupiat hunters die instantly (George, Two mechanisms working in concert may govern heat loss by (1) control of water flow along the CCM's surface and (2) vascular engorgement or constriction of blood vessels internal to the organ.

Thermal analysis indicates that the palatal organ remains 6–8°C above other external body surfaces for up to 10‐hr postmortem. The organ's vasculature, which was observed to traverse this groove, may link with the basicranial rete (Albert, The tongue has a median sulcus that runs along the length of its dorsal surface (Lambertsen et al., 1989; Werth, Thermoregulation typically involves means both to radiate and to conserve heat for which CCHE structures are well suited.

Erection of the organ apparently redirects vascular flow from arteries to vascular sinuses and extravascular spaces, then to veins.

The bowhead whale palatal vascular organ is a rete (Fawcett, These features of the organ, and its placement on the oral surface of the maxilla, have led to this newly described structure being named the corpus cavernosum maxillaris (CCM). they have mechanisms to keep a constant body temperature which is generally higher than the temperature of the environment. CCHE retia) for heat conservation and large deposits of lingual adipose tissue (George, The CCM's total surface area when engorged, estimated from direct measurements and photographs to be 0.48 mOwing to its location in the center of the mouth, the CCM is ideally positioned to radiate excess body heat, even with its small surface area (∼0.48 mTissue examination of the CCM reveals terminal bodies and rich innervation, likely relating to control of blood vessels, although it is possible that the profusion of nerves relate to sensory function. The upper photograph shows the CCM organ in visible light, illustrating its gross anatomical position on the palatal midline (in oblique ventral view, looking into the mouth of a whale lying on its back and right side).

The CCM is shown (central shaded area) in ventral view (rostrum at top) running along the palatal surface of the maxilla on the midline of the skull.A: Photomicrographic overview of the CCM, near the center of its length (scale bar = 1 cm).

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