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The thorax of cats and humans is made up of three layers of intercostal muscles. Subcostal muscles and transverses muscles can also be found in this region.
There are three types of muscles found in the human body. The muscles found in the body are the visceral, cardiac, and skeletal muscles.
Bladder, throat, and stomach.
cardiac, smooth, and skeletal.
Smooth, striated, and cardiac are the three kinds of muscle tissue found in human beings.
Skeletal muscle is found in all muscles (mainly in charge of movement) other than the heart (cardiac muscle) and the organs (smooth muscle)
Skelatal muscles. there are three types of muscles Smooth (linining the digestive system) Cardiac (your heart) and Skelatal (triceps biceps pecs)
Thoracic is a medical term that has three syllables.
Cardiac muscle- found in the heart Smooth muscle-compose hollow internal structures, such as blood vessels and organs, such as the stomach Skeletal muscles-These are the muscles attached to the bones,
Skeletal muscles can be found all over the body - the biceps, the triceps, the abdominals, the hamstrings, etc.
- Skeletal muscle / voluntary (ex.: Brachialis muscle) - Smooth muscle / involuntary (ex.: The three layers of muscles around the stomach) - Cardiac muscle / involuntary (i.e. the myocardium)
There are three layers of intercostal muscles: the External Intercosals, the Internal Intercostals and the Innermost Intercostals. These muscles are the one found between the Ribs in the ribcage and all are innervated by coastal nerves. At rest these particular muscles have very little function it is only during Forced Respiration (forced breathing not the cellular kind of respiration) that they come into action. During Forced Inspiration the Diaphragm pulls down as normal but to maximise increase the size of the Thoracic Cavity and suck in extra air the the external intercostals are activated. These muscles pull the ribs up and forwards. During normal expiration the elasticity of the lungs themsevels as well as action from the abdominal muscles shrink the thoracic cavity pushing the used air out again. This is not fast enough however for exercising, where forced expiration is required. Here the internal and innermost intercostals pull the ribs down and back compressing the thoracic cavity and forcefull (as aposed to passively) push the air out. Damage to any layer of the intercostal muscles is likely to make breathing during exercise much harder and less efficient.