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11 maj 2022 · In 1913, Foote identified in the middle part of the black bear femoral compact bone tissue the presence of plexiform bone tissue with scattered Haversian systems. In contrast, Enlow and Brown (Citation 1958) noted in the mandible of Ursus americanus the presence of primary vascular reticular and dense Haversian bone tissue. In the ribs, the ...
10 paź 2024 · The vertebral column of the black bear is composed of cervical, thoracic, lumbar, sacral, and caudal vertebrae, each serving a specific function. The lumbar region is highly flexible, allowing the bear to twist and turn its body with agility.
27 gru 2019 · This is a living reference work entry that describes unique morphological traits of the bear family (family Ursidae). The chapter covers general morphology, coat, body shape and skeletal...
1 sty 2022 · Bears have a robust skeletal structure, with relatively short limbs and heavy bones and large scapula and pelvis to support their body mass. The forelimbs are strong and are used in various activities, ranging from digging for foraging or den construction to killing prey and interactions with other bears.
11 kwi 2024 · The vertebral column of bears consists of a series of strong vertebrae, including cervical (neck), thoracic (chest), lumbar (lower back), sacral (pelvis), and caudal (tail) vertebrae. These vertebrae provide support and flexibility, enabling bears to move with agility and strength.
The American black bear (Ursus americanus) is a large, plantigrade mammal with a broad skull, small ears, and non-retractable claws. Its pelage varies in color depending on its geographic location, and it lacks the shoulder hump seen in brown bears.
In this study, we investigated the architectural properties of bear femurs to determine whether cortical structure is preserved with age in bears. We showed that cross-sectional geometric properties increase with age, but porosity and resorption cavity density do not change with age in skeletally immature male and female bears.
