722 MANUAL, OF PHYSIOLOGY. 



pani, the external auditory meatus and ear being formed by an 

 outgrowth of the tissue surrounding the tympanic membrane. 



The mandibular arch contains, close to its connection with the 

 superior maxillary process, a rod of cartilage, called Meckel's car- 

 tilage. This becomes partly converted into the malleus, partly 

 into the internal lateral ligaments of the teraporo-maxillary ar- 

 ticulation. 



The second, or hyoid arch, gives origin to the incus, the stylo- 

 hyoid process and ligament, together with the lesser wings of the 

 hyoid bone. 



From the third arch arise the body and greater wings of the 

 hyoid bone together with the thyroid cartilage. 



