Muscle relaxants are medications that are used to help relax the muscles and can be used to help reduce pain that comes from strains, sprains, cramp and muscular injuries. They can also help to combat general stress and can be used to aid sleep (and even to prevent sleepwalking).
The left lung has an indentation, called the cardiac depression, for the normal placement of the heart. Behind this is the hilum, through which the blood vessels, lymphatics, and bronchi enter and leave the lung.Air travels from the nasal passages to the pharynx, larynx, and trachea.hat part of the lung that is not covered by pleura and through which blood vessels, bronchi, nerves and lymphatics enter and leave the lung. lung lobe torsion. occurs uncommonly in dogs and cats, most often of the right middle lobe. May occur spontaneously, following trauma, or in association with pleural effusion.
1 Hilum: At about the middle of the mediastinal surface, there is a depression where the bronchi, blood vessels and nerves, which form the root, enter of leave the lung. 2  Anterior border: The anterior border of the lungs is thin and overlaps the heart.3  It is here on theleft lung that the cardiac notch is found.hape of lungs: Each lung is conical in outline and is covered with visceral pleura. It suspends freely in its own pleural cavity and is attached to the mediastinum only through its root (the place where blood vessels and bronchi attach to the lung at hilum).