Interrelationship Between Systems of the Human Body Assignment
Relationship between the nervous and musculoskeletal system
Interrelationship Between Systems of the Human Body: Muscle is a contractile tissue that can be histologically divided into three types. These are: striated or skeletal muscle, which are under direct nervous control; cardiac muscle, which is also striated but is a specialist form that is confined specifically to the heart; and smooth or visceral muscle, which is not under direct nervous control (Nair and Peate, 2013). This latter form can be found in the walls of blood vessels and the alimentary tract and in arrector pili. Smooth muscle is usually in the form of flat sheets and forms circular and longitudinal layers, or can be arranged as a sphincter in order to control passage through a tube, for example the anus (Ikebe, 1996). Skeletal muscle is usually attached to two separate bones via tendon, fleshy or aponeurosis connections.
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Muscle action control is carried out by the nervous system (Stein, 1982). Contact between nerves and muscles often occurs through chemical stimulus conveyed by motor end plates, which instruct muscles to contract. Signals can also be sent through tendons via specific receptors that are able to measure the stretch of the tendon (Stein, 1982). Messages from nerves are referred to as efferent when they take a message to a specific tissue and afferent when they are taking the message to the spinal cord and brain (Craig, 2005). As such the nervous system comprises two separate but combined systems. These are the central and peripheral nervous systems, with the former being made up of the brain and spinal cord, and the latter comprising the remaining neural network (Cervero, 1988). This neural network comprises 12 pairs of head nerves connected to the brain and 31 pairs of spinal nerves connected to the spinal cord. Nerves which transfer information from receptors within the body to the central nervous system are sensoric nerves, whilst nerves that transport information from the CNS to muscle fibres are motoric nerves (Cervero, 1988). As such, the peripheral nervous system comprises collections of nerves, their insulating myelin sheaths, Schwann cells and connective tissue. The majority of these nerve cells are able to carry out efferent and afferent cell processes (Craig, 2005).
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