684 SYNOPSIS OF MUSCULAR NERVES. 



The sole of the foot is supplied by the plantar nerves. The internal 

 plantar nerve gives branches to three toes and a half ; the external to the 

 remaining one toe and a half. 



SYNOPSIS OF THE MUSCULAR DISTRIBUTION OF THE 

 CEREBRO-SPINAL NERVES. 



MUSCLES OF THE HEAD AND FORE PART OF THE NECK. 



The muscles of the orbit are mostly supplied by the third cranial nerve 

 the superior division of that nerve being distributed to the levator palpebrzo 

 and the superior rectus muscles ; and the inferior division to the inferior and 

 internal recti and the inferior oblique. The superior oblique muscle is supplied 

 by the fourth nerve, the external rectus by the sixth ; while the tensor 

 tarsi has no special nerve apart from those of the orbicularis palpebrarum, 

 which are derived from the facial. 



The superficial muscles of the face and scalp, which are associated in their 

 action as a group of muscles of expression, are supplied by the portio dura 

 of the seventh cranial nerve ; the retrahens auriculam arid occipitalis 

 muscles being supplied by the posterior auricular branch. 



The deep muscles of the face, employed in mastication, viz., the temporal, 

 masseler, buccinator, and two pterygoid muscles, are supplied by the inferior 

 maxillary division of the fifth cranial nerve. 



Muscles above the hyoid bone. The mylo-hyoid muscle and anterior belly 

 of the digastric are supplied by a special biauch of the inferior maxillary 

 division of the fifth cranial nerve ; the posterior belly of the digastric 

 muscle, and the stylo-hyoid, are supplied by branches of the portio dura. The 

 genio-hyoid and the muscles of the tongue receive their nervous supply 

 from the hypoglossal nerve. 



The muscles ascending to the hyoid bone and laiynx, viz., the sterno-hyoid, 

 omo-hyoid, and sterno-thyroid, are supplied from the ramns descendens noni 

 and its loop with the cervical plexus, while the thyro-hyoid muscle receives 

 a separate twig from the ninth nerve. 



The larynx, pharynx, and soft palate. The crico- thyroid muscle is sup- 

 plied by the external laryngeal branch of the pneumo-gastric nerve, and the 

 other intrinsic muscles of the larynx by the recurrent laryngeal. The 

 muscles of the pharynx are supplied principally by the pharyngeal branch of 

 the pneumo -gastric ; the stylo-pharyngeus, however, is supplied by the 

 glosso-pharyngeal nerve. Of the muscles of the soft palate unconnected 

 with the tongue or pharynx, the tensor palati receives its nerve from the otic 

 ganglion (which also supplies the tensor tympani); the levator palati gets a 

 twig (Meckel) from the posterior palatine branch of the spheno-palatiue 

 ganglion, and the azygos uvulee is probably supplied from the same source. 



MUSCLES BELONGING EXCLUSIVELY TO THE TRUNK, AND MUSCLES 

 ASCENDING TO THE SKULL. 



All those muscles of the back which are unconnected with the upper limb, 

 viz., the posterior serrati, the splenius, complexus, erector spiuse, and the 

 muscles more deeply placed, receive their supply from the posterior divisions 

 of the spinal nerves. 



The sterno-mastoid is supplied by the spinal accessory nerve and a twig 

 of the cervical plexus coming from the second cervical nerve. 



