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The hypaxial muscles are a set of vertebrate trunk muscles that lie on the ventral side of the body, often below the horizontal septum of vertebrae. They are innervated by the ventral ramus of spinal nerves and include some vertebral muscles, the diaphragm, abdominal muscles, and all limb muscles. Hypaxial muscles are responsible for locomotion, prey-capturing, and respiration in terrestrial environments. The development of hypaxial muscles is controlled by specific regulatory genes, and their differentiation is thought to have evolved as a new trait in vertebrate animals.
| Characteristics | Values |
|---|---|
| Location | Ventral side of the body |
| Vertebrae | Lie ventral to the horizontal septum of the vertebrae |
| Muscle Groups | Vertebral muscles, diaphragm, abdominal muscles, limb muscles, serratus posterior inferior, serratus posterior superior |
| Innervation | Ventral ramus (branch) of the spinal nerves |
| Function | Locomotion, prey-capturing, respiration |
| Development | Evolved from chordate ancestors, complex anatomical changes and changes in underlying gene regulatory networks |
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What You'll Learn
- Hypaxial muscles are located on the ventral side of the body
- They include some vertebral muscles, the diaphragm, abdominal muscles, and all limb muscles
- Hypaxial muscles are responsible for locomotion, prey-capturing, and respiration
- They are innervated by the ventral ramus of spinal nerves
- Hypaxial and epaxial muscles develop directly from somitic cells
Hypaxial muscles are located on the ventral side of the body
The hypaxial muscles are located on the ventral side of the body. This anatomical term refers to all the ventrally located musculature in the body of vertebrates, including the body wall and limb muscles. The hypaxial muscles include some vertebral muscles, the diaphragm, the abdominal muscles, and all limb muscles.
In adult vertebrates, trunk muscles are divided into hypaxial and epaxial muscles, which lie ventral and dorsal to the horizontal septum of the vertebrae, respectively. The hypaxial muscles are innervated by the ventral ramus of the spinal nerves, while the epaxial muscles are innervated by the dorsal ramus. The serratus posterior inferior and serratus posterior superior are hypaxial muscles innervated by the ventral primary ramus.
The distinction between epaxial and hypaxial muscles is more pronounced in cartilaginous and bony fish, where the two compartments are separated by the horizontal myoseptum. In the tail region, the epaxial and hypaxial portions contract in a coordinated manner, allowing for S-shaped swimming movements.
The development of hypaxial muscles is controlled by specific regulatory genes. In amniotes, the Pax3-positive dermomyotome supplies precursor cells for both epaxial and hypaxial muscles. At the limb levels, hypaxial muscle precursors migrate into the limb bud, proliferate, and generate limb muscles. This process is influenced by the expression of genes such as Lbx1, c-met, and CXCR4.
The hypaxial muscles play a crucial role in locomotion, prey-capturing, and respiration in terrestrial environments. Their complex evolutionary history dates back to the early vertebrates and their chordate ancestors, involving significant anatomical changes and modifications in gene regulatory networks.
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They include some vertebral muscles, the diaphragm, abdominal muscles, and all limb muscles
The hypaxial muscles are located on the ventral side of the body, often found below the horizontal septum of the vertebrae in vertebrates. They include some vertebral muscles, the diaphragm, abdominal muscles, and all limb muscles.
The vertebral muscles are part of the back muscles, which start just under the skull, go across the shoulders, and run down the spine to the lower back, just above the hips. They attach to bones across the body, including the vertebrae, which are the bones that make up the spinal column. These muscles help to move the back and torso, even when a person is not actively thinking about it, and they provide constant support to hold a person in place.
The diaphragm is a vital muscle that plays a crucial role in breathing by expanding and contracting the chest during inhalation and exhalation.
Abdominal muscles, also known as abs, consist of five main muscle groups: pyramidalis, rectus abdominis, external obliques, internal obliques, and transversus abdominis. They are strong bands of muscles lining the walls of the abdomen, located between the rib cage and the pelvis at the front of the body. These muscles have various important functions, including holding organs in place, supporting the body during movement, and maintaining internal abdominal pressure.
Limb muscles include the muscles of the upper and lower limbs. The upper limb muscles are organised into anatomical compartments, including the axioappendicular groups that arise from the axial skeleton to act upon the pectoral girdle. The muscles of the upper limbs, such as the chest and shoulder muscles, include the pectoralis major, deltoid, coracobrachialis, biceps brachii, brachialis, and brachioradialis. The muscle mass in the limbs depends on the balance between protein synthesis and degradation, which is influenced by factors like nutritional status, physical activity, and underlying diseases.
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Hypaxial muscles are responsible for locomotion, prey-capturing, and respiration
The hypaxial muscles are located on the ventral side of the body, often found below the horizontal septum of the vertebrae in many species, including fish, amphibians, and adult vertebrates. These muscles include some vertebral muscles, the diaphragm, the abdominal muscles, and all limb muscles. The hypaxial group also includes muscles with highly differentiated morphology and function, such as those associated with paired limbs, shoulder girdles, and tongue/infrahyoid (hypobranchial) muscles.
The hypaxial muscles are innervated by the ventral ramus (branch) of the spinal nerves, which means they receive motor signals from the spinal cord that control their movement and function. This is in contrast to the epaxial muscles, which lie dorsal to the septum and are innervated by the dorsal ramus. The differentiation between hypaxial and epaxial muscles is thought to have evolved as a new trait in vertebrate animals.
The hypaxial muscles are responsible for several important functions, including locomotion, prey-capturing, and respiration. In amniotes, such as mammals, birds, and reptiles, the hypaxial muscles contribute to the complex combination of skeletal musculature in the trunk. The coordinated contraction of these muscles is essential for S-shaped swimming movements in fish and amphibians.
The hypaxial muscles also play a crucial role in respiration. In mammals, the hypaxial somites contribute to the diaphragm, a vital component of the respiratory system. This muscle group's ability to contract and relax helps facilitate inhalation and exhalation, respectively, ensuring proper respiratory function.
In summary, the hypaxial muscles are a distinct group of muscles located on the ventral side of the body, below the horizontal septum. They possess a wide range of functions, including locomotion, prey-capturing, and respiration, all of which are controlled by specific regulatory genes. The differentiation and development of these muscles have played a significant role in the evolution of vertebrate animals.
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They are innervated by the ventral ramus of spinal nerves
Hypaxial muscles are those located on the ventral side of the body, often below the horizontal septum. They include some vertebral muscles, the diaphragm, the abdominal muscles, and all limb muscles. The serratus posterior inferior and serratus posterior superior are hypaxial muscles innervated by the ventral primary ramus.
The hypaxial muscles are innervated by the ventral ramus (branch) of the spinal nerves. Spinal nerves are mixed nerves that interact directly with the spinal cord to modulate motor and sensory information from the body's periphery. Each nerve is formed from nerve fibres known as fila radicularia, extending from the posterior (dorsal) and anterior (ventral) roots of the spinal cord. The roots connect via interneurons.
The spinal nerve divides into two branches: a larger anterior or ventral ramus and a smaller posterior or dorsal ramus. The anterior/ventral ramus innervates the skin and muscle on the anterior aspect of the trunk, while the posterior/dorsal ramus innervates the post-vertebral muscles and the skin of the back. The nerve fibres supplying the upper limb are from the anterior rami, which have been redistributed within a network of nerves called the nerve plexus.
The ventral rami are much more robust in size and function compared to the dorsal rami. The ventral rami provide the spinal contributions to all major neural plexuses and are responsible for the majority of the body's sensorimotor innervation. The four main plexuses formed by the ventral rami are the cervical plexus, brachial plexus, lumbar plexus, and sacral plexus. These plexuses innervate various parts of the body, including the muscles of the neck, diaphragm, neck and upper chest, pectoral girdle, upper limb, pelvic girdle, and lower limbs.
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Hypaxial and epaxial muscles develop directly from somitic cells
The vertebrate body can be divided into two sections: the trunk and the limbs. The trunk muscles can be further divided into hypaxial and epaxial muscles. The hypaxial muscles are located on the ventral side of the body, often below the horizontal septum of the vertebrae, and include some vertebral muscles, the diaphragm, the abdominal muscles, and all limb muscles. The serratus posterior inferior and serratus posterior superior are also hypaxial muscles.
Epaxial muscles, on the other hand, are located on the dorsal side of the body, above the horizontal septum of the vertebrae, and 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.
The evolution of hypaxial and epaxial muscles is a fascinating area of study. It is believed that these muscles evolved from vertebrates' chordate ancestors, and complex anatomical changes and changes in underlying gene regulatory networks occurred. The development of hypaxial muscles is controlled by specific regulatory genes. In amniotes, Pax3-positive dermomyotomes supply precursor cells of epaxial and hypaxial muscles. At the limb levels, precursor cells of appendicular muscles delaminate and migrate distally in the limb bud. These cells express c-met and CXCR4 receptors that detect ligands in the limb bud mesenchyme.
The evolution of hypaxial and epaxial muscles is also associated with the acquisition of the neck and fins in vertebrates. The lamprey, an extant jawless vertebrate, lacks many derived traits of gnathostomes, such as jaws, paired fins, and the epaxial/hypaxial distinction of trunk skeletal musculatures. However, lampreys possess the primitive form of the hypobranchial muscle, which requires the unique Lbx gene during development.
In summary, hypaxial and epaxial muscles develop directly from somitic cells, and their differentiation is thought to have evolved as a new trait in vertebrate animals. The evolution of these muscles involved complex anatomical changes and the interaction of muscle-related genes.
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Frequently asked questions
Hypaxial muscles are the anatomical term used to refer to all the ventrally located musculature in the body of vertebrates, including the body wall and limb muscles.
Hypaxial muscles are located on the ventral side of the body, often below the horizontal septum.
Epaxial and hypaxial muscles are the two types of trunk muscles in adult vertebrates. Epaxial muscles lie dorsal to the septum, while hypaxial muscles lie ventral to the horizontal septum.
Examples of hypaxial muscles include some vertebral muscles, the diaphragm, the abdominal muscles, and all limb muscles.
Hypaxial muscles develop from somitic cells. Their differentiation is thought to have evolved as a new trait in vertebrate animals.
