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Location varies, with some species containing these only near the tails, while some have them located near the scapular or pelvic girdles. Depending on the species, myomeres could be arranged in an epaxial or hypaxial manner. Hypaxial refers to ventral muscles and related structures while epaxial refers to more dorsal muscles.
Except for the size, the species are very similar in general appearance, differing mainly in the number of myotomes and the pigmentation of their larvae. [47] They have a translucent, somewhat fish-like body, but without any paired fins or other limbs. A relatively poorly developed tail fin is present, so they are not especially good swimmers.
The myotome is that part of a somite that forms the muscles of the animal. [2] Each myotome divides into an epaxial part (epimere), at the back, and a hypaxial part (hypomere) at the front. [2] The myoblasts from the hypaxial division form the muscles of the thoracic and anterior abdominal walls.
Branchiostoma belcheri is related to other species of Branchiostoma as it is marine, distributed in shallow waters, positioned with its anterior end in the sand, mostly sedentary, has a small, slender body, is segmented and transparent, has a trunk, tail, median fins, myotomes, notochord, complete digestive tract, and dorsal nerve cord, is ...
Notochord is positioned just ventral to the neural tube and dorsal to the gut, flanked by myotome. (D) Notochord homolog in annelid. Cross-section showing the position of the proposed axochord to the ventral mesentery, blood vessel, and nerve chord.
The Indian oil sardine (Sardinella longiceps) is a species of ray-finned fish in the genus Sardinella. It is one of the two most important commercial fishes in India (with the mackerel). [2] The Indian oil sardine is one of the more regionally limited species of Sardinella and can be found in the northern regions of the Indian Ocean. These fish ...
A myotome is the group of muscles that a single spinal nerve innervates. [1] Similarly a dermatome is an area of skin that a single nerve innervates with sensory fibers. Myotomes are separated by myosepta (singular: myoseptum). [2] In vertebrate embryonic development, a myotome is the part of a somite that develops into muscle.
The mitochondrial genome of Branchiostoma lanceolatum has been sequenced, [7] [4] and the species serves as a model organism for studying the development of vertebrates. The way the coding genes and the two rRNA genes are organised is the same as the organisational method used by the sea lamprey ( Petromyzon marinus ).