DIRECTIONS FOE LABORATORY WORK 815 



especially with respect to the uvea or complete middle tunic. Do these 

 several arterial systems anastomose ? Note also the radicles of the Tena 

 vorticosae. Sketch (387) lateral half of bulbus oculi. 



(b) Trace out also the lymphatic systems of the eye. 



(C) THE OCULAR APPENDAGES. 



(1) THE PALPEBILE (eye-lids). Study l.p. a stained vertical 

 section of the human superior eye-lid. Note: cutaneous surface, rimal 

 margin and the conjunctival surface; the orbicularis palpebrarum mus- 

 cle, insertion of the musculus levator palpebrae superioris, the superior 

 palpebral muscle of Muller, the ciliary muscle of Kiolan, and the tarsal 

 fascia (tarsus) ; the cilia (eye-lashes), sebaceous glands of Zeiss, glands 

 of Moll, tarsal glands of Meibon, and the glands of Waldeyer (posterior 

 tarsal glands) ; the primary and secondary tarsal (arterial) arches. 

 Sketch (388). 



Make h.p. sketch (389) of the palpebral conjunctiva near the level 

 of the fornix conjunctivas. 



(2) THE LACRIMAL GLAND. Study a stained section of the lacrimal 

 gland. Sketch l.p. (390) a lobule, showing the ducts and the secre- 

 tory tubules. Make h.p. sketches (391, a, b, etc,) of sections of tubules 

 at several stages of secretory activity. Where are the accessory lacrimal 

 glands of Krause? Location and significance of the gland of Harder? 



XXI. THE EAR 



(A) THE EXTERNAL EAR. 



(1) AURICLE (Pinna). Study l.p. a stained section of the lobule 

 of the ear, including adjacent portion of the pinna. Note the absence 

 of cartilage in the lobule proper, and the abundant adipose tissue. 

 Sketch (392). Make h.p. sketch (393) of portion of the elastic carti- 

 lage of the pinna. Note the relatively large number of cells. 



(2) Study l.p. a stained section of the cartilaginous portion of the 

 External Acoustic Meatus. Note the abundant large stiff hairs, seba- 

 ceous glands, and ceruminous glands. Sketch (394). Sketch h.p. (395) 

 a transverse section of the secretory portion of the coiled, simple tubular, 

 ceruminous gland. Enumerate differences and resemblances between the 

 ceruminous glands, the sudoriparous glands, and the mammary glands. 



(B) THE MIDDLE EAR (Tympanum). 



(1) Study l.p. a stained radial section of the tympanic membrane. 

 Note: annulus tympanicus; umbo, with attached manubrium of the 



