Ki^oTT — On Abnormalities in Suman Myology. 411 



reoideus posticus (Bochdalek). — Of this muscle I have founcT seven 

 cases of unilateral development, and two others in which its fibres 

 were symmetrical. 



Crico-e^nglotticus. — Under this name has been described a bundle of 

 muscular fibres often found (thirty-four per cent., Krause) arising from 

 the inner surface of cricoid cartilage, and passing upwards beneath the 

 mucous membrane to the margin of the epiglottis. I have been able 

 to define it three times in nineteen subjects. It was bilateral in each 

 case. Sometimes a similar bundle terminates in the arytaeno-epiglotti- 

 dean fold of mucous membrane forming a crico-membranosus. 



Crico-tracJiealis. — Of this anomalous muscle I have met with one 

 specimen on the left side of the body of a female subject. It came 

 from lower border of cricoid cartilage, approaching close to the median 

 line in front, and having a breadth of abo^^t half an inch above; it 

 gradually narrowed as it passed down to its insertion into the fourth 

 and fifth rings of the trachea behind the isthmus of the thyroid body. 



Thyreo-trachealis (Gruber) ; thyreo-trachealis profundus (Krause). — 

 From lower border of thyroid cartilage to upper part of trachea. This 

 band of muscular fibres I found three times in twenty-eight subjects in 

 ■which its existence was specially searched for. The muscle was sym- 

 metrical in one case ; in the others single ; in both on left side. The 

 inferior attachment varied in all. In one case the insertion was into 

 the third ring of the trachea ; in another into third and fourth. In the 

 case in which the muscle existed on both sides the insertion was into 

 the fourth and fifth rings on one side (the left) ; on the other into 

 the fifth ring alone. 



Tliyreo-syndesmicus (Sommerring). — From superior corner of thyroid 

 cartilage to posterior border of thyro-hyoid ligament. In one subject 

 I found this small anomalous band of muscular fibres present on both 

 sides. I have met with no other example. 



Thyreoideus transversus anomalus (Gruber) (s. impar) ; thy reoideus 

 marginalis inferior ; incisurae {cartilaginis thyroideae) mediae transver- 

 sus. — This band of muscular fibres crosses from one side of lower border 

 of ala of thyroid cartilage to the other, lying in front of the upper part 

 of the crico-thyroid membrane. I have met with two examples. 



Thyreo-eorniculatus. — Fibres arising in common with the upper fibres 

 of thyreo-arytaenoideus, and passing obliquely upwards and backwards 

 to the cartilage of Santorini. A bundle of fibres answering to this de- 

 scription I have met with in two cases out of nineteen in which they 

 were sought for with special care. A similar bundle of fibres going 

 to the cartilage of Wrisberg has been described under the name of — 



Thyreo-cuneiformis. — This I have not seen. 



Thyreo-epiglotticus inferior (s. major) and superior (s. minor). — Two 

 very thin laminae of muscular fibres arising from inner surface of 

 thyroid cartilage, and ascending to the adjacent margin of the epi- 

 glottis, some blending with upper fibres of arytaeno-epiglottideus. 

 Inferior frequently takes some fibres of origin from upper border of 

 thyro-arytenoideus. I have found one or both of these strata in about 

 oneJhaK of the cases in which they were carefully sought for before 



