What is an Epimere in anatomy?
[ep´ĭ-mēr] the dorsal portion of a somite, from which are formed muscles innervated by the dorsal ramus of a spinal nerve.
What is Epimere and Hypomere?
Epimere – Segment of myotome that is dorsal to the body axis. Hypomere – Segment of myotome that is ventral to the body axis. Myotome – That part of the somite that gives rise to the skeletal muscle cells.
What muscles form from the Abaxial and Primaxial domain?
The intercostal and suspension muscles, which connect the limbs to the body (rhomboids, trapezii, pectorals, latissimus dorsii), are thought to be derived from a mixture of primaxial and abaxial precursors (Burke and Nowicki, 2003).
What is Primaxial and Abaxial?
The primaxial domain refers to mesoderm derived exclusively from the somite mesoderm, the myotome. The abaxial domain refers to mesoderm of both somite and lateral plate origin, forming the infrahyoid muscles, abdominal wall muscles and the limb muscles.
What is a Epimere in biology?
epimere (plural epimeres) (biology) One of the segments of the transverse axis, or the so-called homonymous parts; as, for example, one of the several segments of the extremities in vertebrates, or one of the similar segments in plants, as in a segmented leaf.
What is a Hypomere?
Medical Definition of hypomere : one of the segments from which the walls of the pleuroperitoneal cavity develop.
What is the Hypomere?
[ hī′pə-mîr′ ] n. The portion of the myotome that forms muscle of the body wall and that is innervated by a branch of a spinal nerve. The somatic and splanchnic layers of the lateral mesoderm that give rise to the lining of the celom.
What is bird gastrulation?
Gastrulation is the process by which the embryo generates three germ layers: ectoderm, mesoderm and endoderm. Amniote (reptiles, birds and mammals) embryos have a unique capacity to regulate, meaning that when an embryo is cut into half or smaller pieces each piece can generate a whole embryo.
What muscle is derived from the Epimere?
erector spinae
In current theory, the epimere consists of myotome cells that are entirely of somite origin and which will develop into the epaxial musculature (erector spinae, etc.). These are the muscles innervated by dorsal primary rami of spinal nerves.
Where are Epaxial muscles located?
Epaxial muscles include other (dorsal) muscles associated with the vertebrae, ribs, and base of the skull. In humans, the erector spinae, the transversospinales (including the multifidus, semispinalis and rotatores), the splenius and suboccipital muscles are the only epaxial muscles.
What is paraxial mesoderm?
Paraxial mesoderm, also known as presomitic or somitic mesoderm is the area of mesoderm in the neurulating embryo that flanks and forms simultaneously with the neural tube.