An introduction to anatomy and physiology : for the use of general readers, young persons, and junior medical students.

  • Sandwith, Thomas.
Date:
1825
Catalogue details

Licence: Public Domain Mark

Credit: An introduction to anatomy and physiology : for the use of general readers, young persons, and junior medical students. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    muscular fibres, (the platysma myoides,) extend- ing from the jaw to the breast. In animals it lines the skin universally, and is called the fleshy pannicle. In the hedgehog it is highly curious and complicated, and enables the animal to roll itself up like a ball. The ruffling of the feathers in the neck of the dove, and other birds, is effected by this muscle. * Mastication consists of the elevation and de- pression of the lower jaw, and its lateral and circular motions, around one condyle as a fixed point. These movements are effected by the masseters, pterygoid, and temporal muscles, and their antagonists, the muscles beneath the chin. Of the temporal muscle much need not be said. It covers the temple and side of the head, and passing beneath the jugum, is inserted tendinous, into the coronoid process of the lower jaw. The massetur is placed between the jugum and the angle of the jaw; and the pterygoid 'are deep- seated muscles, attached to the sphaenoid bone, and the jaw internally, f The muscles beneath * It is worthy the attention of the surgeon, as without a knowledge of' the direction of its fibres, he cannot even open the external jugular vein with effect. t The temporal artery mounting before the ear, on the temporal muscle, divides into two branches; and the trans-