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Testing of myotomes, in the form of isometric resisted muscle testing, provides the clinician with information about the level in the spine where a lesion may be present. [7] During myotome testing, the clinician is looking for muscle weakness of a particular group of muscles.
In vertebrates, somites subdivide into the dermatomes, myotomes, sclerotomes and syndetomes that give rise to the vertebrae of the vertebral column, rib cage, part of the occipital bone, skeletal muscle, cartilage, tendons, and skin (of the back). [2] The word somite is sometimes also used in place of the word metamere.
Filet of salmon showing the zig-zag of myomeres Fillet of iridescent shark showing the zig-zag of myomeres. The shape of myomeres varies by species. Myomeres are commonly zig-zag, "V" (lancelets), "W" (fishes), or straight (tetrapods)– shaped muscle fibers.
Position of notochord and axochord in bilaterians. (A) Zebrafish notochord. (B) Ascidian notochord. (C) Lancelet notochord. Notochord is positioned just ventral to the neural tube and dorsal to the gut, flanked by myotome.
This is a list of human anatomy mnemonics, categorized and alphabetized.For mnemonics in other medical specialties, see this list of medical mnemonics.Mnemonics serve as a systematic method for remembrance of functionally or systemically related items within regions of larger fields of study, such as those found in the study of specific areas of human anatomy, such as the bones in the hand ...
[7] [8] The musculature they supply develops as the hypoglossal cord from the myotomes of the first four pairs of occipital somites. [9] [10] The nerve is first visible as a series of roots in the fourth week of development, which have formed a single nerve and link to the tongue by the fifth week. [11] [12]
The development of the egg requires only 24 hours. These eggs are spherical and range from 1 to 4 mm in diameter. These fish are called oil sardines because an oil globule makes up a major part of the egg yolk. These fish have 53 myotomes in the larval stage, but adults have only 46-48 vertebrae.
The first seven somitomeres give rise to the striated muscles of the face, jaws, and throat. [2]The remaining somitomeres, likely driven by periodic expression of the hairy gene, begin expressing adhesion proteins such as N-cadherin and fibronectin, compact, and bud off forming somites.