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The endoskeleton of the fish is made up of two main components: the axial skeleton consisting of the skull and vertebral column, and the appendicular skeleton supporting the fins. [7] The fins are made up of bony fin rays and, except for the caudal fin, have no direct connection with the spine.
Arothron nigropunctatus is a small sized fish which grows up to 33 cm (1 ft) length. [2] Its body is oval shape, spherical and relatively elongated. The skin is not covered with scales. The fish has no pelvic fin and no lateral line. The dorsal fin and the anal fin are small, symmetric and located at the end of the body. Its snout is short with ...
An image of the forensic model of a Neolithic dog skull found at Cuween Hill Chambered Cairn, Orkney, Scotland was published by Sci-News.com on April 22, 2019. Forensic artist Amy Thornton made a model of the dog's head using a 3D print, based on a CT scan made at the Royal (Dick) School of Veterinary Studies of one of the 24 canine skulls ...
The human skull is the bone structure that forms the head in the human skeleton. It supports the structures of the face and forms a cavity for the brain. Like the skulls of other vertebrates, it protects the brain from injury. [6] The skull consists of three parts, of different embryological origin—the neurocranium, the sutures, and the ...
Dogs have ear mobility that allows them to rapidly pinpoint the exact location of a sound. Eighteen or more muscles can tilt, rotate, raise, or lower a dog's ear. A dog can identify a sound's location much faster than a human can, as well as hear sounds at four times the distance. [41] Dogs can lose their hearing from age or an ear infection. [42]
In modern times, the Chinantecs and Mixes of Oaxaca believe that a black dog will help the newly dead to cross a body of water, either a river or a sea, to the land of the dead. [20] [21] The Huitzilan believe that a dog carries the dead across the water to reach the underworld home of the Devil. [2]
A true endoskeleton is derived from mesodermal tissue. In three phyla of animals, Chordata, Echinodermata and Porifera (), endoskeletons of various complexity are found.An endoskeleton may function purely for structural support (as in the case of Porifera), but often also serves as an attachment site for muscles and a mechanism for transmitting muscular forces as in chordates and echinoderms ...