Archive image from page 828 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( THE MOEPHOLOGY OF THE CEREBRAL NERVES. '95 Ramus Thyreohyoideus.—The nerve to the thyreo-hyoid muscle is a small branch which arises from the hypoglossal nerve before it passes beneath the mylo- hyoid muscle. It descends behind the greater cornu of the hyoid bone to reach the muscle. When traced backwards this nerve is found associated with the loop between the first and second cervical nerves. Rami Linguales.—The lingual branches of the hypoglossal ne
Archive image from page 828 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( THE MOEPHOLOGY OF THE CEREBRAL NERVES. '95 Ramus Thyreohyoideus.—The nerve to the thyreo-hyoid muscle is a small branch which arises from the hypoglossal nerve before it passes beneath the mylo- hyoid muscle. It descends behind the greater cornu of the hyoid bone to reach the muscle. When traced backwards this nerve is found associated with the loop between the first and second cervical nerves. Rami Linguales.—The lingual branches of the hypoglossal nerve are distributed to the hyoglossus, genio-hyoid, and genioglossus, and to all the intrinsic muscles of the tongue. The nerve to the genio-hyoid is said to be derived from the loop between the first and second cervical nerves. It is not known if these two cervical nerves are implicated in the innervation of the proper muscles of the tongue, but it appears certain that the muscles named—the genio-hyoid, thyreo-hyoid, sterno- hyoid, omo-hyoid, and sterno-thyreoid—are not supplied by the hypoglossal, but only by cervical nerves, the genio-hyoid and thyreo-hyoid by the first two, the other muscles by the first three cervical nerves. THE MORPHOLOGY OF THE CEREBRAL NERVES. The head and face, possibly the oldest, and from every point of view the most fundamental and important portion of the body fabric, present in some respects a more conservative type of LATERAL AREA MEDIAL AREA Fig. 665. -Comparison of Origins of Nerve' Roots from Spinal Medulla and Hind-Brain (after His). A. Spinal medulla ; B. Hind-brain. structure, and in other aspects have been subject to more profound alterations than other parts of the body. Segmentation is characteristic of the trunk, pervading bones, muscles, vessels, and nerves. An absence of true segmentation is characteristic of the head region—omitting for the moment the cerebral nerves. The head is characterised by the possession of an un
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