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The evolution of the mammalian middle ear appears to have occurred in two steps. A partial middle ear formed by the departure of postdentary bones from the dentary, and happened independently in the ancestors of monotremes and therians. The second step was the transition to a definite mammalian middle ear, and evolved independently at least ...
The ossicles (also called auditory ossicles) are three irregular bones in the middle ear of humans and other mammals, and are among the smallest bones in the human body. . Although the term "ossicle" literally means "tiny bone" (from Latin ossiculum) and may refer to any small bone throughout the body, it typically refers specifically to the malleus, incus and stapes ("hammer, anvil, and ...
An otolith (Ancient Greek: ὠτο-, ōto-ear + λῐ́θος, líthos, a stone), also called otoconium, statolith, or statoconium, is a calcium carbonate structure in the saccule or utricle of the inner ear, specifically in the vestibular system of vertebrates. The saccule and utricle, in turn, together make the otolith organs.
[2] [3] In 1893, Robert Wiedersheim published The Structure of Man, a book on human anatomy and its relevance to evolutionary history. This book contains a list of 86 human organs he considered vestigial, which he called "wholly or in part functionless, some appearing in the Embryo alone, others present during Life constantly or inconstantly.
Sometimes accessory parotid glands are found as an anatomic variation. These are close to the main glands and consist of ectopic salivary gland tissue. [2] Capsule of parotid gland. A capsule of the parotid gland is formed from the investing layer of the deep cervical fascia. It is supplied by the great auricular nerve.
Get ready for all of the NYT 'Connections’ hints and answers for #182 on Sunday, December 10, 2023. Connections game on Sunday, December 10 , 2023 The New York Times
The holotype was found in a silt and mudstone bed over a 1.8 m 2 (19 sq ft) area. [2] Further excavation recovered most of the holotype's skeleton—most notably the hip, sacrum , and most of ribcage and thoracolumbar series (the spine excluding the neck, sacrum, and tail).
A white-tailed deer's tail. The tail is the elongated section at the rear end of a bilaterian animal's body; in general, the term refers to a distinct, flexible appendage extending backwards from the midline of the torso. In vertebrate animals that evolved to lose their tails (e.g. frogs and hominid primates), the coccyx is the homologous ...