2 jo THE POCKET ANATOMY 



1. Stratified squamous, in the region of the nostrils. 



2. Columnar, in the olfactory region. 



3. Ciliated columnar, in the respiratory region and the 

 sinuses. 



The vessels to the nose are the following arteries and veins : 

 spheno-palatine, branches of descending palatine, and arteria 

 septi nasi from facial. The nerves are : olfactory, nasal (first 

 division 5th), naso-palatine, nasal branch of Vidian, nasal 

 branch from anterior palatine and from Meckel's ganglion. 



The Olfactory Nerve. From the olfactory lobe there pro- 

 ceed about twenty branches through the cribriform plate of 

 the ethmoid, which may be divided into three sets : 



1. Inner : pass along the grooves on the septum. 



2. Middle : distributed to the roof. 



3. Outer: passing to the upper turbinate bone, the anterior 

 part of plain surface of the ethmoid and the middle turbinate 

 bones. 



THE EAR. 



The ear is divided, for the purpose of description, into 

 three parts, external, middle, and internal. 



THE EXTERNAL EAR. 



The external er>r consists of the auricle or pinna, and the 

 external auditory meat us. 



The pinna is a plate of cartilage covered with integument, 

 and attached to the commencement of the meatus ; it has 

 numerous ridges and depressions, as follows : the external 

 rim is the helix, and anterior and parallel to it is another 

 ridge, the anti helix, which bifurcates above to enclose the 

 fossa of the anti-helix ; between the helix and anti-helix is the 

 fossa of the helix . Anterior to the anti-helix is a depression, 

 the concha; projecting backwards over the meatus is the 

 tragus, and opposite to the latter is the anti-tragus. The 

 lowest part of the pinna, which contains no cartilage, is called 

 the lobule. It is controlled by three muscles (p. 22). 



The external auditory meatus reaches from the bottom of 

 the concha to the membrana tympani ; it is i inches long. 

 It is arched slightly upwards, and is directed forwards and 

 inwards ; it is formed partly by cartilage and partly by bone. 

 The outer or cartilaginous part is continuous with the pinna, 

 and is about inch long. The cartilage does not form a 



