396 ANATOMY FOR NURSES [Chap. XIX 



11. Spinal accessory (motor). 



12. Hypoglossal (motor). 



The following doggerel which has been handed down through 

 countless generations of students may assist the beginner in learn- 

 ing the order of the cranial nerves. Each capital letter denotes a 

 cranial nerve. On Old ^Manhattan's Peaked Tops A Finn And 

 German Picked Some Hops. 



(1) The olfactory ner\'e is the special nerve of the sense of smell 

 Its origin is in the olfactory bulb, and its peripheral fibres are 

 distributed to the upper third of the nasal cavity. 



(2) The optic nerve is the special nerve of the sense of sight. Its 

 cell-bodies are situated in the retinal coat of the eye. 



(3) The motor oculi nerve supplies all the muscles of the eye 

 except the superior oblique and the external rectus. It originates 

 in the gray matter of the pons Varolii. 



(4) The pathetic, or trochlear, nerve supplies only the superior 

 oblique muscle of the eye. It arises close to the preceding nerve. 



(5) The trifacial has two roots, — a dorsal, or sensory, and a 

 ventral, or motor. The fibres from the two roots coalesce into one 

 trunk, and then subdivide into three large branches : (1) the oph- 

 thalmic, (2) the superior maxillary, and (3) the inferior maxillary. 

 The ophthalmic branch is the smallest, and is a sensory nerve. It 

 supplies the eyeball, the lacrimal gland, the mucous lining of the eye 

 and nose, and the skin and muscles of the eyebrow, forehead, and 

 nose. The superior maxillary, the second division of the fifth, is 

 also a sensory nerve, and supplies the skin of the temple and cheek, 

 the upper teeth, and the mucous lining of the mouth and pharynx. 

 The inferior maxillary is the largest of the three divisions of the 

 fifth, and is both a sensory and a motor nerve. It sends branches 

 to the temple and the external ear ; to the teeth and lower jaw ; 

 to the muscles of mastication ; it also supplies the tongue with a 

 special nerve (the lingual) of the sense of taste. The cell-bodies 

 of the motor fibres are situated in the pons ; while those of the 

 sensory fibres, as in the case of the spinal nerves, are situated in a 

 ganglion. This ganglion is called the Gasserian ganglion. 



(6) The abducens nerve supplies the external rectus muscle of 

 the eye. 



(7) The facial nerve is the motor nerve of all the muscles 

 of expression in the face ; it also supplies the neck and ear. Its 



